Merge branch 'linus' into perf/urgent

Merge reason: we need to fix a non-trivial merge conflict.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

44 files changed, 1391 insertions, 1385 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 2d9de86b7e76..cb41b9547c9f 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -27,7 +27,6 @@ obj-y += power/
 
 obj-$(CONFIG_FREEZER) += freezer.o
 obj-$(CONFIG_PROFILING) += profile.o
-obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o
 obj-$(CONFIG_STACKTRACE) += stacktrace.o
 obj-y += time/
 obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
diff --git a/kernel/audit.c b/kernel/audit.c
index bb0eb5bb9a0a..1c7f2c61416b 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1418,7 +1418,7 @@ void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
 
 /* This is a helper-function to print the escaped d_path */
 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
-		      struct path *path)
+		      const struct path *path)
 {
 	char *p, *pathname;
 
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a5d3b5325f77..f4ea4b6f3cf1 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -818,7 +818,7 @@ static int cgroup_call_pre_destroy(struct cgroup *cgrp)
 
 	for_each_subsys(cgrp->root, ss)
 		if (ss->pre_destroy) {
-			ret = ss->pre_destroy(ss, cgrp);
+			ret = ss->pre_destroy(cgrp);
 			if (ret)
 				break;
 		}
@@ -846,7 +846,7 @@ static void cgroup_diput(struct dentry *dentry, struct inode *inode)
 		 * Release the subsystem state objects.
 		 */
 		for_each_subsys(cgrp->root, ss)
-			ss->destroy(ss, cgrp);
+			ss->destroy(cgrp);
 
 		cgrp->root->number_of_cgroups--;
 		mutex_unlock(&cgroup_mutex);
@@ -1015,7 +1015,7 @@ static int rebind_subsystems(struct cgroupfs_root *root,
 			list_move(&ss->sibling, &root->subsys_list);
 			ss->root = root;
 			if (ss->bind)
-				ss->bind(ss, cgrp);
+				ss->bind(cgrp);
 			mutex_unlock(&ss->hierarchy_mutex);
 			/* refcount was already taken, and we're keeping it */
 		} else if (bit & removed_bits) {
@@ -1025,7 +1025,7 @@ static int rebind_subsystems(struct cgroupfs_root *root,
 			BUG_ON(cgrp->subsys[i]->cgroup != cgrp);
 			mutex_lock(&ss->hierarchy_mutex);
 			if (ss->bind)
-				ss->bind(ss, dummytop);
+				ss->bind(dummytop);
 			dummytop->subsys[i]->cgroup = dummytop;
 			cgrp->subsys[i] = NULL;
 			subsys[i]->root = &rootnode;
@@ -1472,7 +1472,6 @@ static int cgroup_get_rootdir(struct super_block *sb)
 
 	struct inode *inode =
 		cgroup_new_inode(S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR, sb);
-	struct dentry *dentry;
 
 	if (!inode)
 		return -ENOMEM;
@@ -1481,12 +1480,9 @@ static int cgroup_get_rootdir(struct super_block *sb)
 	inode->i_op = &cgroup_dir_inode_operations;
 	/* directories start off with i_nlink == 2 (for "." entry) */
 	inc_nlink(inode);
-	dentry = d_alloc_root(inode);
-	if (!dentry) {
-		iput(inode);
+	sb->s_root = d_make_root(inode);
+	if (!sb->s_root)
 		return -ENOMEM;
-	}
-	sb->s_root = dentry;
 	/* for everything else we want ->d_op set */
 	sb->s_d_op = &cgroup_dops;
 	return 0;
@@ -1763,6 +1759,7 @@ EXPORT_SYMBOL_GPL(cgroup_path);
 struct task_and_cgroup {
 	struct task_struct	*task;
 	struct cgroup		*cgrp;
+	struct css_set		*cg;
 };
 
 struct cgroup_taskset {
@@ -1843,11 +1840,10 @@ EXPORT_SYMBOL_GPL(cgroup_taskset_size);
  * will already exist. If not set, this function might sleep, and can fail with
  * -ENOMEM. Must be called with cgroup_mutex and threadgroup locked.
  */
-static int cgroup_task_migrate(struct cgroup *cgrp, struct cgroup *oldcgrp,
-			       struct task_struct *tsk, bool guarantee)
+static void cgroup_task_migrate(struct cgroup *cgrp, struct cgroup *oldcgrp,
+				struct task_struct *tsk, struct css_set *newcg)
 {
 	struct css_set *oldcg;
-	struct css_set *newcg;
 
 	/*
 	 * We are synchronized through threadgroup_lock() against PF_EXITING
@@ -1857,23 +1853,6 @@ static int cgroup_task_migrate(struct cgroup *cgrp, struct cgroup *oldcgrp,
 	WARN_ON_ONCE(tsk->flags & PF_EXITING);
 	oldcg = tsk->cgroups;
 
-	/* locate or allocate a new css_set for this task. */
-	if (guarantee) {
-		/* we know the css_set we want already exists. */
-		struct cgroup_subsys_state *template[CGROUP_SUBSYS_COUNT];
-		read_lock(&css_set_lock);
-		newcg = find_existing_css_set(oldcg, cgrp, template);
-		BUG_ON(!newcg);
-		get_css_set(newcg);
-		read_unlock(&css_set_lock);
-	} else {
-		might_sleep();
-		/* find_css_set will give us newcg already referenced. */
-		newcg = find_css_set(oldcg, cgrp);
-		if (!newcg)
-			return -ENOMEM;
-	}
-
 	task_lock(tsk);
 	rcu_assign_pointer(tsk->cgroups, newcg);
 	task_unlock(tsk);
@@ -1892,7 +1871,6 @@ static int cgroup_task_migrate(struct cgroup *cgrp, struct cgroup *oldcgrp,
 	put_css_set(oldcg);
 
 	set_bit(CGRP_RELEASABLE, &oldcgrp->flags);
-	return 0;
 }
 
 /**
@@ -1910,6 +1888,7 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
 	struct cgroup *oldcgrp;
 	struct cgroupfs_root *root = cgrp->root;
 	struct cgroup_taskset tset = { };
+	struct css_set *newcg;
 
 	/* @tsk either already exited or can't exit until the end */
 	if (tsk->flags & PF_EXITING)
@@ -1925,7 +1904,7 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
 
 	for_each_subsys(root, ss) {
 		if (ss->can_attach) {
-			retval = ss->can_attach(ss, cgrp, &tset);
+			retval = ss->can_attach(cgrp, &tset);
 			if (retval) {
 				/*
 				 * Remember on which subsystem the can_attach()
@@ -1939,13 +1918,17 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
 		}
 	}
 
-	retval = cgroup_task_migrate(cgrp, oldcgrp, tsk, false);
-	if (retval)
+	newcg = find_css_set(tsk->cgroups, cgrp);
+	if (!newcg) {
+		retval = -ENOMEM;
 		goto out;
+	}
+
+	cgroup_task_migrate(cgrp, oldcgrp, tsk, newcg);
 
 	for_each_subsys(root, ss) {
 		if (ss->attach)
-			ss->attach(ss, cgrp, &tset);
+			ss->attach(cgrp, &tset);
 	}
 
 	synchronize_rcu();
@@ -1967,7 +1950,7 @@ out:
 				 */
 				break;
 			if (ss->cancel_attach)
-				ss->cancel_attach(ss, cgrp, &tset);
+				ss->cancel_attach(cgrp, &tset);
 		}
 	}
 	return retval;
@@ -1997,66 +1980,6 @@ int cgroup_attach_task_all(struct task_struct *from, struct task_struct *tsk)
 }
 EXPORT_SYMBOL_GPL(cgroup_attach_task_all);
 
-/*
- * cgroup_attach_proc works in two stages, the first of which prefetches all
- * new css_sets needed (to make sure we have enough memory before committing
- * to the move) and stores them in a list of entries of the following type.
- * TODO: possible optimization: use css_set->rcu_head for chaining instead
- */
-struct cg_list_entry {
-	struct css_set *cg;
-	struct list_head links;
-};
-
-static bool css_set_check_fetched(struct cgroup *cgrp,
-				  struct task_struct *tsk, struct css_set *cg,
-				  struct list_head *newcg_list)
-{
-	struct css_set *newcg;
-	struct cg_list_entry *cg_entry;
-	struct cgroup_subsys_state *template[CGROUP_SUBSYS_COUNT];
-
-	read_lock(&css_set_lock);
-	newcg = find_existing_css_set(cg, cgrp, template);
-	read_unlock(&css_set_lock);
-
-	/* doesn't exist at all? */
-	if (!newcg)
-		return false;
-	/* see if it's already in the list */
-	list_for_each_entry(cg_entry, newcg_list, links)
-		if (cg_entry->cg == newcg)
-			return true;
-
-	/* not found */
-	return false;
-}
-
-/*
- * Find the new css_set and store it in the list in preparation for moving the
- * given task to the given cgroup. Returns 0 or -ENOMEM.
- */
-static int css_set_prefetch(struct cgroup *cgrp, struct css_set *cg,
-			    struct list_head *newcg_list)
-{
-	struct css_set *newcg;
-	struct cg_list_entry *cg_entry;
-
-	/* ensure a new css_set will exist for this thread */
-	newcg = find_css_set(cg, cgrp);
-	if (!newcg)
-		return -ENOMEM;
-	/* add it to the list */
-	cg_entry = kmalloc(sizeof(struct cg_list_entry), GFP_KERNEL);
-	if (!cg_entry) {
-		put_css_set(newcg);
-		return -ENOMEM;
-	}
-	cg_entry->cg = newcg;
-	list_add(&cg_entry->links, newcg_list);
-	return 0;
-}
-
 /**
  * cgroup_attach_proc - attach all threads in a threadgroup to a cgroup
  * @cgrp: the cgroup to attach to
@@ -2070,20 +1993,12 @@ static int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
 	int retval, i, group_size;
 	struct cgroup_subsys *ss, *failed_ss = NULL;
 	/* guaranteed to be initialized later, but the compiler needs this */
-	struct css_set *oldcg;
 	struct cgroupfs_root *root = cgrp->root;
 	/* threadgroup list cursor and array */
 	struct task_struct *tsk;
 	struct task_and_cgroup *tc;
 	struct flex_array *group;
 	struct cgroup_taskset tset = { };
-	/*
-	 * we need to make sure we have css_sets for all the tasks we're
-	 * going to move -before- we actually start moving them, so that in
-	 * case we get an ENOMEM we can bail out before making any changes.
-	 */
-	struct list_head newcg_list;
-	struct cg_list_entry *cg_entry, *temp_nobe;
 
 	/*
 	 * step 0: in order to do expensive, possibly blocking operations for
@@ -2102,23 +2017,14 @@ static int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
 	if (retval)
 		goto out_free_group_list;
 
-	/* prevent changes to the threadgroup list while we take a snapshot. */
-	read_lock(&tasklist_lock);
-	if (!thread_group_leader(leader)) {
-		/*
-		 * a race with de_thread from another thread's exec() may strip
-		 * us of our leadership, making while_each_thread unsafe to use
-		 * on this task. if this happens, there is no choice but to
-		 * throw this task away and try again (from cgroup_procs_write);
-		 * this is "double-double-toil-and-trouble-check locking".
-		 */
-		read_unlock(&tasklist_lock);
-		retval = -EAGAIN;
-		goto out_free_group_list;
-	}
-
 	tsk = leader;
 	i = 0;
+	/*
+	 * Prevent freeing of tasks while we take a snapshot. Tasks that are
+	 * already PF_EXITING could be freed from underneath us unless we
+	 * take an rcu_read_lock.
+	 */
+	rcu_read_lock();
 	do {
 		struct task_and_cgroup ent;
 
@@ -2128,24 +2034,24 @@ static int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
 
 		/* as per above, nr_threads may decrease, but not increase. */
 		BUG_ON(i >= group_size);
-		/*
-		 * saying GFP_ATOMIC has no effect here because we did prealloc
-		 * earlier, but it's good form to communicate our expectations.
-		 */
 		ent.task = tsk;
 		ent.cgrp = task_cgroup_from_root(tsk, root);
 		/* nothing to do if this task is already in the cgroup */
 		if (ent.cgrp == cgrp)
 			continue;
+		/*
+		 * saying GFP_ATOMIC has no effect here because we did prealloc
+		 * earlier, but it's good form to communicate our expectations.
+		 */
 		retval = flex_array_put(group, i, &ent, GFP_ATOMIC);
 		BUG_ON(retval != 0);
 		i++;
 	} while_each_thread(leader, tsk);
+	rcu_read_unlock();
 	/* remember the number of threads in the array for later. */
 	group_size = i;
 	tset.tc_array = group;
 	tset.tc_array_len = group_size;
-	read_unlock(&tasklist_lock);
 
 	/* methods shouldn't be called if no task is actually migrating */
 	retval = 0;
@@ -2157,7 +2063,7 @@ static int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
 	 */
 	for_each_subsys(root, ss) {
 		if (ss->can_attach) {
-			retval = ss->can_attach(ss, cgrp, &tset);
+			retval = ss->can_attach(cgrp, &tset);
 			if (retval) {
 				failed_ss = ss;
 				goto out_cancel_attach;
@@ -2169,17 +2075,12 @@ static int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
 	 * step 2: make sure css_sets exist for all threads to be migrated.
 	 * we use find_css_set, which allocates a new one if necessary.
 	 */
-	INIT_LIST_HEAD(&newcg_list);
 	for (i = 0; i < group_size; i++) {
 		tc = flex_array_get(group, i);
-		oldcg = tc->task->cgroups;
-
-		/* if we don't already have it in the list get a new one */
-		if (!css_set_check_fetched(cgrp, tc->task, oldcg,
-					   &newcg_list)) {
-			retval = css_set_prefetch(cgrp, oldcg, &newcg_list);
-			if (retval)
-				goto out_list_teardown;
+		tc->cg = find_css_set(tc->task->cgroups, cgrp);
+		if (!tc->cg) {
+			retval = -ENOMEM;
+			goto out_put_css_set_refs;
 		}
 	}
 
@@ -2190,8 +2091,7 @@ static int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
 	 */
 	for (i = 0; i < group_size; i++) {
 		tc = flex_array_get(group, i);
-		retval = cgroup_task_migrate(cgrp, tc->cgrp, tc->task, true);
-		BUG_ON(retval);
+		cgroup_task_migrate(cgrp, tc->cgrp, tc->task, tc->cg);
 	}
 	/* nothing is sensitive to fork() after this point. */
 
@@ -2200,7 +2100,7 @@ static int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
 	 */
 	for_each_subsys(root, ss) {
 		if (ss->attach)
-			ss->attach(ss, cgrp, &tset);
+			ss->attach(cgrp, &tset);
 	}
 
 	/*
@@ -2209,21 +2109,22 @@ static int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
 	synchronize_rcu();
 	cgroup_wakeup_rmdir_waiter(cgrp);
 	retval = 0;
-out_list_teardown:
-	/* clean up the list of prefetched css_sets. */
-	list_for_each_entry_safe(cg_entry, temp_nobe, &newcg_list, links) {
-		list_del(&cg_entry->links);
-		put_css_set(cg_entry->cg);
-		kfree(cg_entry);
+out_put_css_set_refs:
+	if (retval) {
+		for (i = 0; i < group_size; i++) {
+			tc = flex_array_get(group, i);
+			if (!tc->cg)
+				break;
+			put_css_set(tc->cg);
+		}
 	}
 out_cancel_attach:
-	/* same deal as in cgroup_attach_task */
 	if (retval) {
 		for_each_subsys(root, ss) {
 			if (ss == failed_ss)
 				break;
 			if (ss->cancel_attach)
-				ss->cancel_attach(ss, cgrp, &tset);
+				ss->cancel_attach(cgrp, &tset);
 		}
 	}
 out_free_group_list:
@@ -2245,22 +2146,14 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid, bool threadgroup)
 	if (!cgroup_lock_live_group(cgrp))
 		return -ENODEV;
 
+retry_find_task:
+	rcu_read_lock();
 	if (pid) {
-		rcu_read_lock();
 		tsk = find_task_by_vpid(pid);
 		if (!tsk) {
 			rcu_read_unlock();
-			cgroup_unlock();
-			return -ESRCH;
-		}
-		if (threadgroup) {
-			/*
-			 * RCU protects this access, since tsk was found in the
-			 * tid map. a race with de_thread may cause group_leader
-			 * to stop being the leader, but cgroup_attach_proc will
-			 * detect it later.
-			 */
-			tsk = tsk->group_leader;
+			ret= -ESRCH;
+			goto out_unlock_cgroup;
 		}
 		/*
 		 * even if we're attaching all tasks in the thread group, we
@@ -2271,29 +2164,38 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid, bool threadgroup)
 		    cred->euid != tcred->uid &&
 		    cred->euid != tcred->suid) {
 			rcu_read_unlock();
-			cgroup_unlock();
-			return -EACCES;
+			ret = -EACCES;
+			goto out_unlock_cgroup;
 		}
-		get_task_struct(tsk);
-		rcu_read_unlock();
-	} else {
-		if (threadgroup)
-			tsk = current->group_leader;
-		else
-			tsk = current;
-		get_task_struct(tsk);
-	}
-
-	threadgroup_lock(tsk);
+	} else
+		tsk = current;
 
 	if (threadgroup)
+		tsk = tsk->group_leader;
+	get_task_struct(tsk);
+	rcu_read_unlock();
+
+	threadgroup_lock(tsk);
+	if (threadgroup) {
+		if (!thread_group_leader(tsk)) {
+			/*
+			 * a race with de_thread from another thread's exec()
+			 * may strip us of our leadership, if this happens,
+			 * there is no choice but to throw this task away and
+			 * try again; this is
+			 * "double-double-toil-and-trouble-check locking".
+			 */
+			threadgroup_unlock(tsk);
+			put_task_struct(tsk);
+			goto retry_find_task;
+		}
 		ret = cgroup_attach_proc(cgrp, tsk);
-	else
+	} else
 		ret = cgroup_attach_task(cgrp, tsk);
-
 	threadgroup_unlock(tsk);
 
 	put_task_struct(tsk);
+out_unlock_cgroup:
 	cgroup_unlock();
 	return ret;
 }
@@ -2305,16 +2207,7 @@ static int cgroup_tasks_write(struct cgroup *cgrp, struct cftype *cft, u64 pid)
 
 static int cgroup_procs_write(struct cgroup *cgrp, struct cftype *cft, u64 tgid)
 {
-	int ret;
-	do {
-		/*
-		 * attach_proc fails with -EAGAIN if threadgroup leadership
-		 * changes in the middle of the operation, in which case we need
-		 * to find the task_struct for the new leader and start over.
-		 */
-		ret = attach_task_by_pid(cgrp, tgid, true);
-	} while (ret == -EAGAIN);
-	return ret;
+	return attach_task_by_pid(cgrp, tgid, true);
 }
 
 /**
@@ -2804,15 +2697,20 @@ static void cgroup_advance_iter(struct cgroup *cgrp,
  * using their cgroups capability, we don't maintain the lists running
  * through each css_set to its tasks until we see the list actually
  * used - in other words after the first call to cgroup_iter_start().
- *
- * The tasklist_lock is not held here, as do_each_thread() and
- * while_each_thread() are protected by RCU.
  */
 static void cgroup_enable_task_cg_lists(void)
 {
 	struct task_struct *p, *g;
 	write_lock(&css_set_lock);
 	use_task_css_set_links = 1;
+	/*
+	 * We need tasklist_lock because RCU is not safe against
+	 * while_each_thread(). Besides, a forking task that has passed
+	 * cgroup_post_fork() without seeing use_task_css_set_links = 1
+	 * is not guaranteed to have its child immediately visible in the
+	 * tasklist if we walk through it with RCU.
+	 */
+	read_lock(&tasklist_lock);
 	do_each_thread(g, p) {
 		task_lock(p);
 		/*
@@ -2824,6 +2722,7 @@ static void cgroup_enable_task_cg_lists(void)
 			list_add(&p->cg_list, &p->cgroups->tasks);
 		task_unlock(p);
 	} while_each_thread(g, p);
+	read_unlock(&tasklist_lock);
 	write_unlock(&css_set_lock);
 }
 
@@ -3043,6 +2942,38 @@ int cgroup_scan_tasks(struct cgroup_scanner *scan)
  *
  */
 
+/* which pidlist file are we talking about? */
+enum cgroup_filetype {
+	CGROUP_FILE_PROCS,
+	CGROUP_FILE_TASKS,
+};
+
+/*
+ * A pidlist is a list of pids that virtually represents the contents of one
+ * of the cgroup files ("procs" or "tasks"). We keep a list of such pidlists,
+ * a pair (one each for procs, tasks) for each pid namespace that's relevant
+ * to the cgroup.
+ */
+struct cgroup_pidlist {
+	/*
+	 * used to find which pidlist is wanted. doesn't change as long as
+	 * this particular list stays in the list.
+	*/
+	struct { enum cgroup_filetype type; struct pid_namespace *ns; } key;
+	/* array of xids */
+	pid_t *list;
+	/* how many elements the above list has */
+	int length;
+	/* how many files are using the current array */
+	int use_count;
+	/* each of these stored in a list by its cgroup */
+	struct list_head links;
+	/* pointer to the cgroup we belong to, for list removal purposes */
+	struct cgroup *owner;
+	/* protects the other fields */
+	struct rw_semaphore mutex;
+};
+
 /*
  * The following two functions "fix" the issue where there are more pids
  * than kmalloc will give memory for; in such cases, we use vmalloc/vfree.
@@ -3827,7 +3758,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
 		set_bit(CGRP_CLONE_CHILDREN, &cgrp->flags);
 
 	for_each_subsys(root, ss) {
-		struct cgroup_subsys_state *css = ss->create(ss, cgrp);
+		struct cgroup_subsys_state *css = ss->create(cgrp);
 
 		if (IS_ERR(css)) {
 			err = PTR_ERR(css);
@@ -3841,7 +3772,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
 		}
 		/* At error, ->destroy() callback has to free assigned ID. */
 		if (clone_children(parent) && ss->post_clone)
-			ss->post_clone(ss, cgrp);
+			ss->post_clone(cgrp);
 	}
 
 	cgroup_lock_hierarchy(root);
@@ -3875,7 +3806,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
 
 	for_each_subsys(root, ss) {
 		if (cgrp->subsys[ss->subsys_id])
-			ss->destroy(ss, cgrp);
+			ss->destroy(cgrp);
 	}
 
 	mutex_unlock(&cgroup_mutex);
@@ -4099,7 +4030,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
 	/* Create the top cgroup state for this subsystem */
 	list_add(&ss->sibling, &rootnode.subsys_list);
 	ss->root = &rootnode;
-	css = ss->create(ss, dummytop);
+	css = ss->create(dummytop);
 	/* We don't handle early failures gracefully */
 	BUG_ON(IS_ERR(css));
 	init_cgroup_css(css, ss, dummytop);
@@ -4188,7 +4119,7 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
 	 * no ss->create seems to need anything important in the ss struct, so
 	 * this can happen first (i.e. before the rootnode attachment).
 	 */
-	css = ss->create(ss, dummytop);
+	css = ss->create(dummytop);
 	if (IS_ERR(css)) {
 		/* failure case - need to deassign the subsys[] slot. */
 		subsys[i] = NULL;
@@ -4206,7 +4137,7 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
 		int ret = cgroup_init_idr(ss, css);
 		if (ret) {
 			dummytop->subsys[ss->subsys_id] = NULL;
-			ss->destroy(ss, dummytop);
+			ss->destroy(dummytop);
 			subsys[i] = NULL;
 			mutex_unlock(&cgroup_mutex);
 			return ret;
@@ -4304,7 +4235,7 @@ void cgroup_unload_subsys(struct cgroup_subsys *ss)
 	 * pointer to find their state. note that this also takes care of
 	 * freeing the css_id.
 	 */
-	ss->destroy(ss, dummytop);
+	ss->destroy(dummytop);
 	dummytop->subsys[ss->subsys_id] = NULL;
 
 	mutex_unlock(&cgroup_mutex);
@@ -4580,7 +4511,7 @@ void cgroup_fork_callbacks(struct task_struct *child)
 		for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) {
 			struct cgroup_subsys *ss = subsys[i];
 			if (ss->fork)
-				ss->fork(ss, child);
+				ss->fork(child);
 		}
 	}
 }
@@ -4596,6 +4527,17 @@ void cgroup_fork_callbacks(struct task_struct *child)
  */
 void cgroup_post_fork(struct task_struct *child)
 {
+	/*
+	 * use_task_css_set_links is set to 1 before we walk the tasklist
+	 * under the tasklist_lock and we read it here after we added the child
+	 * to the tasklist under the tasklist_lock as well. If the child wasn't
+	 * yet in the tasklist when we walked through it from
+	 * cgroup_enable_task_cg_lists(), then use_task_css_set_links value
+	 * should be visible now due to the paired locking and barriers implied
+	 * by LOCK/UNLOCK: it is written before the tasklist_lock unlock
+	 * in cgroup_enable_task_cg_lists() and read here after the tasklist_lock
+	 * lock on fork.
+	 */
 	if (use_task_css_set_links) {
 		write_lock(&css_set_lock);
 		if (list_empty(&child->cg_list)) {
@@ -4682,7 +4624,7 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
 				struct cgroup *old_cgrp =
 					rcu_dereference_raw(cg->subsys[i])->cgroup;
 				struct cgroup *cgrp = task_cgroup(tsk, i);
-				ss->exit(ss, cgrp, old_cgrp, tsk);
+				ss->exit(cgrp, old_cgrp, tsk);
 			}
 		}
 	}
@@ -4939,9 +4881,9 @@ void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css)
 
 	rcu_assign_pointer(id->css, NULL);
 	rcu_assign_pointer(css->id, NULL);
-	write_lock(&ss->id_lock);
+	spin_lock(&ss->id_lock);
 	idr_remove(&ss->idr, id->id);
-	write_unlock(&ss->id_lock);
+	spin_unlock(&ss->id_lock);
 	kfree_rcu(id, rcu_head);
 }
 EXPORT_SYMBOL_GPL(free_css_id);
@@ -4967,10 +4909,10 @@ static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
 		error = -ENOMEM;
 		goto err_out;
 	}
-	write_lock(&ss->id_lock);
+	spin_lock(&ss->id_lock);
 	/* Don't use 0. allocates an ID of 1-65535 */
 	error = idr_get_new_above(&ss->idr, newid, 1, &myid);
-	write_unlock(&ss->id_lock);
+	spin_unlock(&ss->id_lock);
 
 	/* Returns error when there are no free spaces for new ID.*/
 	if (error) {
@@ -4985,9 +4927,9 @@ static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
 	return newid;
 remove_idr:
 	error = -ENOSPC;
-	write_lock(&ss->id_lock);
+	spin_lock(&ss->id_lock);
 	idr_remove(&ss->idr, myid);
-	write_unlock(&ss->id_lock);
+	spin_unlock(&ss->id_lock);
 err_out:
 	kfree(newid);
 	return ERR_PTR(error);
@@ -4999,7 +4941,7 @@ static int __init_or_module cgroup_init_idr(struct cgroup_subsys *ss,
 {
 	struct css_id *newid;
 
-	rwlock_init(&ss->id_lock);
+	spin_lock_init(&ss->id_lock);
 	idr_init(&ss->idr);
 
 	newid = get_new_cssid(ss, 0);
@@ -5087,6 +5029,8 @@ css_get_next(struct cgroup_subsys *ss, int id,
 		return NULL;
 
 	BUG_ON(!ss->use_id);
+	WARN_ON_ONCE(!rcu_read_lock_held());
+
 	/* fill start point for scan */
 	tmpid = id;
 	while (1) {
@@ -5094,10 +5038,7 @@ css_get_next(struct cgroup_subsys *ss, int id,
 		 * scan next entry from bitmap(tree), tmpid is updated after
 		 * idr_get_next().
 		 */
-		read_lock(&ss->id_lock);
 		tmp = idr_get_next(&ss->idr, &tmpid);
-		read_unlock(&ss->id_lock);
-
 		if (!tmp)
 			break;
 		if (tmp->depth >= depth && tmp->stack[depth] == rootid) {
@@ -5137,8 +5078,7 @@ struct cgroup_subsys_state *cgroup_css_from_dir(struct file *f, int id)
 }
 
 #ifdef CONFIG_CGROUP_DEBUG
-static struct cgroup_subsys_state *debug_create(struct cgroup_subsys *ss,
-						   struct cgroup *cont)
+static struct cgroup_subsys_state *debug_create(struct cgroup *cont)
 {
 	struct cgroup_subsys_state *css = kzalloc(sizeof(*css), GFP_KERNEL);
 
@@ -5148,7 +5088,7 @@ static struct cgroup_subsys_state *debug_create(struct cgroup_subsys *ss,
 	return css;
 }
 
-static void debug_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
+static void debug_destroy(struct cgroup *cont)
 {
 	kfree(cont->subsys[debug_subsys_id]);
 }
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index fc0646b78a64..f86e93920b62 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -128,8 +128,7 @@ struct cgroup_subsys freezer_subsys;
  *    task->alloc_lock (inside __thaw_task(), prevents race with refrigerator())
  *     sighand->siglock
  */
-static struct cgroup_subsys_state *freezer_create(struct cgroup_subsys *ss,
-						  struct cgroup *cgroup)
+static struct cgroup_subsys_state *freezer_create(struct cgroup *cgroup)
 {
 	struct freezer *freezer;
 
@@ -142,8 +141,7 @@ static struct cgroup_subsys_state *freezer_create(struct cgroup_subsys *ss,
 	return &freezer->css;
 }
 
-static void freezer_destroy(struct cgroup_subsys *ss,
-			    struct cgroup *cgroup)
+static void freezer_destroy(struct cgroup *cgroup)
 {
 	struct freezer *freezer = cgroup_freezer(cgroup);
 
@@ -164,8 +162,7 @@ static bool is_task_frozen_enough(struct task_struct *task)
  * a write to that file racing against an attach, and hence the
  * can_attach() result will remain valid until the attach completes.
  */
-static int freezer_can_attach(struct cgroup_subsys *ss,
-			      struct cgroup *new_cgroup,
+static int freezer_can_attach(struct cgroup *new_cgroup,
 			      struct cgroup_taskset *tset)
 {
 	struct freezer *freezer;
@@ -185,7 +182,7 @@ static int freezer_can_attach(struct cgroup_subsys *ss,
 	return 0;
 }
 
-static void freezer_fork(struct cgroup_subsys *ss, struct task_struct *task)
+static void freezer_fork(struct task_struct *task)
 {
 	struct freezer *freezer;
 
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index a09ac2b9a661..1010cc61931f 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -964,7 +964,6 @@ static void cpuset_change_task_nodemask(struct task_struct *tsk,
 {
 	bool need_loop;
 
-repeat:
 	/*
 	 * Allow tasks that have access to memory reserves because they have
 	 * been OOM killed to get memory anywhere.
@@ -983,45 +982,19 @@ repeat:
 	 */
 	need_loop = task_has_mempolicy(tsk) ||
 			!nodes_intersects(*newmems, tsk->mems_allowed);
-	nodes_or(tsk->mems_allowed, tsk->mems_allowed, *newmems);
-	mpol_rebind_task(tsk, newmems, MPOL_REBIND_STEP1);
 
-	/*
-	 * ensure checking ->mems_allowed_change_disable after setting all new
-	 * allowed nodes.
-	 *
-	 * the read-side task can see an nodemask with new allowed nodes and
-	 * old allowed nodes. and if it allocates page when cpuset clears newly
-	 * disallowed ones continuous, it can see the new allowed bits.
-	 *
-	 * And if setting all new allowed nodes is after the checking, setting
-	 * all new allowed nodes and clearing newly disallowed ones will be done
-	 * continuous, and the read-side task may find no node to alloc page.
-	 */
-	smp_mb();
+	if (need_loop)
+		write_seqcount_begin(&tsk->mems_allowed_seq);
 
-	/*
-	 * Allocation of memory is very fast, we needn't sleep when waiting
-	 * for the read-side.
-	 */
-	while (need_loop && ACCESS_ONCE(tsk->mems_allowed_change_disable)) {
-		task_unlock(tsk);
-		if (!task_curr(tsk))
-			yield();
-		goto repeat;
-	}
-
-	/*
-	 * ensure checking ->mems_allowed_change_disable before clearing all new
-	 * disallowed nodes.
-	 *
-	 * if clearing newly disallowed bits before the checking, the read-side
-	 * task may find no node to alloc page.
-	 */
-	smp_mb();
+	nodes_or(tsk->mems_allowed, tsk->mems_allowed, *newmems);
+	mpol_rebind_task(tsk, newmems, MPOL_REBIND_STEP1);
 
 	mpol_rebind_task(tsk, newmems, MPOL_REBIND_STEP2);
 	tsk->mems_allowed = *newmems;
+
+	if (need_loop)
+		write_seqcount_end(&tsk->mems_allowed_seq);
+
 	task_unlock(tsk);
 }
 
@@ -1399,8 +1372,7 @@ static nodemask_t cpuset_attach_nodemask_from;
 static nodemask_t cpuset_attach_nodemask_to;
 
 /* Called by cgroups to determine if a cpuset is usable; cgroup_mutex held */
-static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
-			     struct cgroup_taskset *tset)
+static int cpuset_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
 {
 	struct cpuset *cs = cgroup_cs(cgrp);
 	struct task_struct *task;
@@ -1436,8 +1408,7 @@ static int cpuset_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
 	return 0;
 }
 
-static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
-			  struct cgroup_taskset *tset)
+static void cpuset_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
 {
 	struct mm_struct *mm;
 	struct task_struct *task;
@@ -1833,8 +1804,7 @@ static int cpuset_populate(struct cgroup_subsys *ss, struct cgroup *cont)
  * (and likewise for mems) to the new cgroup. Called with cgroup_mutex
  * held.
  */
-static void cpuset_post_clone(struct cgroup_subsys *ss,
-			      struct cgroup *cgroup)
+static void cpuset_post_clone(struct cgroup *cgroup)
 {
 	struct cgroup *parent, *child;
 	struct cpuset *cs, *parent_cs;
@@ -1857,13 +1827,10 @@ static void cpuset_post_clone(struct cgroup_subsys *ss,
 
 /*
  *	cpuset_create - create a cpuset
- *	ss:	cpuset cgroup subsystem
  *	cont:	control group that the new cpuset will be part of
  */
 
-static struct cgroup_subsys_state *cpuset_create(
-	struct cgroup_subsys *ss,
-	struct cgroup *cont)
+static struct cgroup_subsys_state *cpuset_create(struct cgroup *cont)
 {
 	struct cpuset *cs;
 	struct cpuset *parent;
@@ -1902,7 +1869,7 @@ static struct cgroup_subsys_state *cpuset_create(
  * will call async_rebuild_sched_domains().
  */
 
-static void cpuset_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
+static void cpuset_destroy(struct cgroup *cont)
 {
 	struct cpuset *cs = cgroup_cs(cont);
 
diff --git a/kernel/cred.c b/kernel/cred.c
index 5791612a4045..97b36eeca4c9 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -16,6 +16,7 @@
 #include <linux/keyctl.h>
 #include <linux/init_task.h>
 #include <linux/security.h>
+#include <linux/binfmts.h>
 #include <linux/cn_proc.h>
 
 #if 0
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 0d7c08784efb..3f88a45e6f0a 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -41,6 +41,7 @@
 #include <linux/delay.h>
 #include <linux/sched.h>
 #include <linux/sysrq.h>
+#include <linux/reboot.h>
 #include <linux/init.h>
 #include <linux/kgdb.h>
 #include <linux/kdb.h>
@@ -75,6 +76,8 @@ static int			exception_level;
 struct kgdb_io		*dbg_io_ops;
 static DEFINE_SPINLOCK(kgdb_registration_lock);
 
+/* Action for the reboot notifiter, a global allow kdb to change it */
+static int kgdbreboot;
 /* kgdb console driver is loaded */
 static int kgdb_con_registered;
 /* determine if kgdb console output should be used */
@@ -96,6 +99,7 @@ static int __init opt_kgdb_con(char *str)
 early_param("kgdbcon", opt_kgdb_con);
 
 module_param(kgdb_use_con, int, 0644);
+module_param(kgdbreboot, int, 0644);
 
 /*
  * Holds information about breakpoints in a kernel. These breakpoints are
@@ -784,6 +788,33 @@ void __init dbg_late_init(void)
 	kdb_init(KDB_INIT_FULL);
 }
 
+static int
+dbg_notify_reboot(struct notifier_block *this, unsigned long code, void *x)
+{
+	/*
+	 * Take the following action on reboot notify depending on value:
+	 *    1 == Enter debugger
+	 *    0 == [the default] detatch debug client
+	 *   -1 == Do nothing... and use this until the board resets
+	 */
+	switch (kgdbreboot) {
+	case 1:
+		kgdb_breakpoint();
+	case -1:
+		goto done;
+	}
+	if (!dbg_kdb_mode)
+		gdbstub_exit(code);
+done:
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block dbg_reboot_notifier = {
+	.notifier_call		= dbg_notify_reboot,
+	.next			= NULL,
+	.priority		= INT_MAX,
+};
+
 static void kgdb_register_callbacks(void)
 {
 	if (!kgdb_io_module_registered) {
@@ -791,6 +822,7 @@ static void kgdb_register_callbacks(void)
 		kgdb_arch_init();
 		if (!dbg_is_early)
 			kgdb_arch_late();
+		register_reboot_notifier(&dbg_reboot_notifier);
 		atomic_notifier_chain_register(&panic_notifier_list,
 					       &kgdb_panic_event_nb);
 #ifdef CONFIG_MAGIC_SYSRQ
@@ -812,6 +844,7 @@ static void kgdb_unregister_callbacks(void)
 	 */
 	if (kgdb_io_module_registered) {
 		kgdb_io_module_registered = 0;
+		unregister_reboot_notifier(&dbg_reboot_notifier);
 		atomic_notifier_chain_unregister(&panic_notifier_list,
 					       &kgdb_panic_event_nb);
 		kgdb_arch_exit();
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index c22d8c28ad84..ce615e064482 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -1111,6 +1111,13 @@ void gdbstub_exit(int status)
 	unsigned char checksum, ch, buffer[3];
 	int loop;
 
+	if (!kgdb_connected)
+		return;
+	kgdb_connected = 0;
+
+	if (!dbg_io_ops || dbg_kdb_mode)
+		return;
+
 	buffer[0] = 'W';
 	buffer[1] = hex_asc_hi(status);
 	buffer[2] = hex_asc_lo(status);
@@ -1129,5 +1136,6 @@ void gdbstub_exit(int status)
 	dbg_io_ops->write_char(hex_asc_lo(checksum));
 
 	/* make sure the output is flushed, lest the bootloader clobber it */
-	dbg_io_ops->flush();
+	if (dbg_io_ops->flush)
+		dbg_io_ops->flush();
 }
diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c
index 20059ef4459a..8418c2f8ec5d 100644
--- a/kernel/debug/kdb/kdb_bp.c
+++ b/kernel/debug/kdb/kdb_bp.c
@@ -153,6 +153,13 @@ static int _kdb_bp_install(struct pt_regs *regs, kdb_bp_t *bp)
 	} else {
 		kdb_printf("%s: failed to set breakpoint at 0x%lx\n",
 			   __func__, bp->bp_addr);
+#ifdef CONFIG_DEBUG_RODATA
+		if (!bp->bp_type) {
+			kdb_printf("Software breakpoints are unavailable.\n"
+				   "  Change the kernel CONFIG_DEBUG_RODATA=n\n"
+				   "  OR use hw breaks: help bph\n");
+		}
+#endif
 		return 1;
 	}
 	return 0;
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 4802eb5840e1..9b5f17da1c56 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -689,7 +689,7 @@ kdb_printit:
 	if (!dbg_kdb_mode && kgdb_connected) {
 		gdbstub_msg_write(kdb_buffer, retlen);
 	} else {
-		if (!dbg_io_ops->is_console) {
+		if (dbg_io_ops && !dbg_io_ops->is_console) {
 			len = strlen(kdb_buffer);
 			cp = kdb_buffer;
 			while (len--) {
diff --git a/kernel/debug/kdb/kdb_keyboard.c b/kernel/debug/kdb/kdb_keyboard.c
index 4bca634975c0..118527aa60ea 100644
--- a/kernel/debug/kdb/kdb_keyboard.c
+++ b/kernel/debug/kdb/kdb_keyboard.c
@@ -25,6 +25,7 @@
 #define KBD_STAT_MOUSE_OBF	0x20	/* Mouse output buffer full */
 
 static int kbd_exists;
+static int kbd_last_ret;
 
 /*
  * Check if the keyboard controller has a keypress for us.
@@ -90,8 +91,11 @@ int kdb_get_kbd_char(void)
 		return -1;
 	}
 
-	if ((scancode & 0x80) != 0)
+	if ((scancode & 0x80) != 0) {
+		if (scancode == 0x9c)
+			kbd_last_ret = 0;
 		return -1;
+	}
 
 	scancode &= 0x7f;
 
@@ -178,35 +182,82 @@ int kdb_get_kbd_char(void)
 		return -1;	/* ignore unprintables */
 	}
 
-	if ((scancode & 0x7f) == 0x1c) {
-		/*
-		 * enter key.  All done.  Absorb the release scancode.
-		 */
+	if (scancode == 0x1c) {
+		kbd_last_ret = 1;
+		return 13;
+	}
+
+	return keychar & 0xff;
+}
+EXPORT_SYMBOL_GPL(kdb_get_kbd_char);
+
+/*
+ * Best effort cleanup of ENTER break codes on leaving KDB. Called on
+ * exiting KDB, when we know we processed an ENTER or KP ENTER scan
+ * code.
+ */
+void kdb_kbd_cleanup_state(void)
+{
+	int scancode, scanstatus;
+
+	/*
+	 * Nothing to clean up, since either
+	 * ENTER was never pressed, or has already
+	 * gotten cleaned up.
+	 */
+	if (!kbd_last_ret)
+		return;
+
+	kbd_last_ret = 0;
+	/*
+	 * Enter key. Need to absorb the break code here, lest it gets
+	 * leaked out if we exit KDB as the result of processing 'g'.
+	 *
+	 * This has several interesting implications:
+	 * + Need to handle KP ENTER, which has break code 0xe0 0x9c.
+	 * + Need to handle repeat ENTER and repeat KP ENTER. Repeats
+	 *   only get a break code at the end of the repeated
+	 *   sequence. This means we can't propagate the repeated key
+	 *   press, and must swallow it away.
+	 * + Need to handle possible PS/2 mouse input.
+	 * + Need to handle mashed keys.
+	 */
+
+	while (1) {
 		while ((inb(KBD_STATUS_REG) & KBD_STAT_OBF) == 0)
-			;
+			cpu_relax();
 
 		/*
-		 * Fetch the scancode
+		 * Fetch the scancode.
 		 */
 		scancode = inb(KBD_DATA_REG);
 		scanstatus = inb(KBD_STATUS_REG);
 
-		while (scanstatus & KBD_STAT_MOUSE_OBF) {
-			scancode = inb(KBD_DATA_REG);
-			scanstatus = inb(KBD_STATUS_REG);
-		}
+		/*
+		 * Skip mouse input.
+		 */
+		if (scanstatus & KBD_STAT_MOUSE_OBF)
+			continue;
 
-		if (scancode != 0x9c) {
-			/*
-			 * Wasn't an enter-release,  why not?
-			 */
-			kdb_printf("kdb: expected enter got 0x%x status 0x%x\n",
-			       scancode, scanstatus);
-		}
+		/*
+		 * If we see 0xe0, this is either a break code for KP
+		 * ENTER, or a repeat make for KP ENTER. Either way,
+		 * since the second byte is equivalent to an ENTER,
+		 * skip the 0xe0 and try again.
+		 *
+		 * If we see 0x1c, this must be a repeat ENTER or KP
+		 * ENTER (and we swallowed 0xe0 before). Try again.
+		 *
+		 * We can also see make and break codes for other keys
+		 * mashed before or after pressing ENTER. Thus, if we
+		 * see anything other than 0x9c, we have to try again.
+		 *
+		 * Note, if you held some key as ENTER was depressed,
+		 * that break code would get leaked out.
+		 */
+		if (scancode != 0x9c)
+			continue;
 
-		return 13;
+		return;
 	}
-
-	return keychar & 0xff;
 }
-EXPORT_SYMBOL_GPL(kdb_get_kbd_char);
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index e2ae7349437f..67b847dfa2bb 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -1400,6 +1400,9 @@ int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
 	if (KDB_STATE(DOING_SS))
 		KDB_STATE_CLEAR(SSBPT);
 
+	/* Clean up any keyboard devices before leaving */
+	kdb_kbd_cleanup_state();
+
 	return result;
 }
 
diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
index e381d105b40b..47c4e56e513b 100644
--- a/kernel/debug/kdb/kdb_private.h
+++ b/kernel/debug/kdb/kdb_private.h
@@ -246,6 +246,13 @@ extern void debug_kusage(void);
 
 extern void kdb_set_current_task(struct task_struct *);
 extern struct task_struct *kdb_current_task;
+
+#ifdef CONFIG_KDB_KEYBOARD
+extern void kdb_kbd_cleanup_state(void);
+#else /* ! CONFIG_KDB_KEYBOARD */
+#define kdb_kbd_cleanup_state()
+#endif /* ! CONFIG_KDB_KEYBOARD */
+
 #ifdef CONFIG_MODULES
 extern struct list_head *kdb_modules;
 #endif /* CONFIG_MODULES */
diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 7d6fb40d2188..d35cc2d3a4cc 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -384,9 +384,9 @@ static int kdb_getphys(void *res, unsigned long addr, size_t size)
 	if (!pfn_valid(pfn))
 		return 1;
 	page = pfn_to_page(pfn);
-	vaddr = kmap_atomic(page, KM_KDB);
+	vaddr = kmap_atomic(page);
 	memcpy(res, vaddr + (addr & (PAGE_SIZE - 1)), size);
-	kunmap_atomic(vaddr, KM_KDB);
+	kunmap_atomic(vaddr);
 
 	return 0;
 }
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 3f92a19aa11e..a6a9ec4cd8f5 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7154,8 +7154,7 @@ unlock:
 device_initcall(perf_event_sysfs_init);
 
 #ifdef CONFIG_CGROUP_PERF
-static struct cgroup_subsys_state *perf_cgroup_create(
-	struct cgroup_subsys *ss, struct cgroup *cont)
+static struct cgroup_subsys_state *perf_cgroup_create(struct cgroup *cont)
 {
 	struct perf_cgroup *jc;
 
@@ -7172,8 +7171,7 @@ static struct cgroup_subsys_state *perf_cgroup_create(
 	return &jc->css;
 }
 
-static void perf_cgroup_destroy(struct cgroup_subsys *ss,
-				struct cgroup *cont)
+static void perf_cgroup_destroy(struct cgroup *cont)
 {
 	struct perf_cgroup *jc;
 	jc = container_of(cgroup_subsys_state(cont, perf_subsys_id),
@@ -7189,8 +7187,7 @@ static int __perf_cgroup_move(void *info)
 	return 0;
 }
 
-static void perf_cgroup_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
-			       struct cgroup_taskset *tset)
+static void perf_cgroup_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
 {
 	struct task_struct *task;
 
@@ -7198,8 +7195,8 @@ static void perf_cgroup_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
 		task_function_call(task, __perf_cgroup_move, task);
 }
 
-static void perf_cgroup_exit(struct cgroup_subsys *ss, struct cgroup *cgrp,
-		struct cgroup *old_cgrp, struct task_struct *task)
+static void perf_cgroup_exit(struct cgroup *cgrp, struct cgroup *old_cgrp,
+			     struct task_struct *task)
 {
 	/*
 	 * cgroup_exit() is called in the copy_process() failure path.
diff --git a/kernel/exit.c b/kernel/exit.c
index 752d2c0abd19..3db1909faed9 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -52,6 +52,7 @@
 #include <linux/hw_breakpoint.h>
 #include <linux/oom.h>
 #include <linux/writeback.h>
+#include <linux/shm.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -424,7 +425,7 @@ void daemonize(const char *name, ...)
 	 */
 	exit_mm(current);
 	/*
-	 * We don't want to have TIF_FREEZE set if the system-wide hibernation
+	 * We don't want to get frozen, in case system-wide hibernation
 	 * or suspend transition begins right now.
 	 */
 	current->flags |= (PF_NOFREEZE | PF_KTHREAD);
@@ -686,11 +687,11 @@ static void exit_mm(struct task_struct * tsk)
 }
 
 /*
- * When we die, we re-parent all our children.
- * Try to give them to another thread in our thread
- * group, and if no such member exists, give it to
- * the child reaper process (ie "init") in our pid
- * space.
+ * When we die, we re-parent all our children, and try to:
+ * 1. give them to another thread in our thread group, if such a member exists
+ * 2. give it to the first ancestor process which prctl'd itself as a
+ *    child_subreaper for its children (like a service manager)
+ * 3. give it to the init process (PID 1) in our pid namespace
  */
 static struct task_struct *find_new_reaper(struct task_struct *father)
 	__releases(&tasklist_lock)
@@ -710,8 +711,11 @@ static struct task_struct *find_new_reaper(struct task_struct *father)
 
 	if (unlikely(pid_ns->child_reaper == father)) {
 		write_unlock_irq(&tasklist_lock);
-		if (unlikely(pid_ns == &init_pid_ns))
-			panic("Attempted to kill init!");
+		if (unlikely(pid_ns == &init_pid_ns)) {
+			panic("Attempted to kill init! exitcode=0x%08x\n",
+				father->signal->group_exit_code ?:
+					father->exit_code);
+		}
 
 		zap_pid_ns_processes(pid_ns);
 		write_lock_irq(&tasklist_lock);
@@ -721,6 +725,29 @@ static struct task_struct *find_new_reaper(struct task_struct *father)
 		 * forget_original_parent() must move them somewhere.
 		 */
 		pid_ns->child_reaper = init_pid_ns.child_reaper;
+	} else if (father->signal->has_child_subreaper) {
+		struct task_struct *reaper;
+
+		/*
+		 * Find the first ancestor marked as child_subreaper.
+		 * Note that the code below checks same_thread_group(reaper,
+		 * pid_ns->child_reaper).  This is what we need to DTRT in a
+		 * PID namespace. However we still need the check above, see
+		 * http://marc.info/?l=linux-kernel&m=131385460420380
+		 */
+		for (reaper = father->real_parent;
+		     reaper != &init_task;
+		     reaper = reaper->real_parent) {
+			if (same_thread_group(reaper, pid_ns->child_reaper))
+				break;
+			if (!reaper->signal->is_child_subreaper)
+				continue;
+			thread = reaper;
+			do {
+				if (!(thread->flags & PF_EXITING))
+					return reaper;
+			} while_each_thread(reaper, thread);
+		}
 	}
 
 	return pid_ns->child_reaper;
@@ -818,25 +845,6 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
 	if (group_dead)
 		kill_orphaned_pgrp(tsk->group_leader, NULL);
 
-	/* Let father know we died
-	 *
-	 * Thread signals are configurable, but you aren't going to use
-	 * that to send signals to arbitrary processes.
-	 * That stops right now.
-	 *
-	 * If the parent exec id doesn't match the exec id we saved
-	 * when we started then we know the parent has changed security
-	 * domain.
-	 *
-	 * If our self_exec id doesn't match our parent_exec_id then
-	 * we have changed execution domain as these two values started
-	 * the same after a fork.
-	 */
-	if (thread_group_leader(tsk) && tsk->exit_signal != SIGCHLD &&
-	    (tsk->parent_exec_id != tsk->real_parent->self_exec_id ||
-	     tsk->self_exec_id != tsk->parent_exec_id))
-		tsk->exit_signal = SIGCHLD;
-
 	if (unlikely(tsk->ptrace)) {
 		int sig = thread_group_leader(tsk) &&
 				thread_group_empty(tsk) &&
@@ -953,7 +961,7 @@ void do_exit(long code)
 	acct_update_integrals(tsk);
 	/* sync mm's RSS info before statistics gathering */
 	if (tsk->mm)
-		sync_mm_rss(tsk, tsk->mm);
+		sync_mm_rss(tsk->mm);
 	group_dead = atomic_dec_and_test(&tsk->signal->live);
 	if (group_dead) {
 		hrtimer_cancel(&tsk->signal->real_timer);
diff --git a/kernel/fork.c b/kernel/fork.c
index 26a7a6707fa7..b9372a0bff18 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -193,6 +193,7 @@ void __put_task_struct(struct task_struct *tsk)
 	WARN_ON(atomic_read(&tsk->usage));
 	WARN_ON(tsk == current);
 
+	security_task_free(tsk);
 	exit_creds(tsk);
 	delayacct_tsk_free(tsk);
 	put_signal_struct(tsk->signal);
@@ -355,7 +356,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
 		charge = 0;
 		if (mpnt->vm_flags & VM_ACCOUNT) {
 			unsigned int len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
-			if (security_vm_enough_memory(len))
+			if (security_vm_enough_memory_mm(oldmm, len)) /* sic */
 				goto fail_nomem;
 			charge = len;
 		}
@@ -511,6 +512,23 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p)
 	return NULL;
 }
 
+static void check_mm(struct mm_struct *mm)
+{
+	int i;
+
+	for (i = 0; i < NR_MM_COUNTERS; i++) {
+		long x = atomic_long_read(&mm->rss_stat.count[i]);
+
+		if (unlikely(x))
+			printk(KERN_ALERT "BUG: Bad rss-counter state "
+					  "mm:%p idx:%d val:%ld\n", mm, i, x);
+	}
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+	VM_BUG_ON(mm->pmd_huge_pte);
+#endif
+}
+
 /*
  * Allocate and initialize an mm_struct.
  */
@@ -538,9 +556,7 @@ void __mmdrop(struct mm_struct *mm)
 	mm_free_pgd(mm);
 	destroy_context(mm);
 	mmu_notifier_mm_destroy(mm);
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	VM_BUG_ON(mm->pmd_huge_pte);
-#endif
+	check_mm(mm);
 	free_mm(mm);
 }
 EXPORT_SYMBOL_GPL(__mmdrop);
@@ -1035,6 +1051,9 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 	sig->oom_score_adj = current->signal->oom_score_adj;
 	sig->oom_score_adj_min = current->signal->oom_score_adj_min;
 
+	sig->has_child_subreaper = current->signal->has_child_subreaper ||
+				   current->signal->is_child_subreaper;
+
 	mutex_init(&sig->cred_guard_mutex);
 
 	return 0;
@@ -1222,6 +1241,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #ifdef CONFIG_CPUSETS
 	p->cpuset_mem_spread_rotor = NUMA_NO_NODE;
 	p->cpuset_slab_spread_rotor = NUMA_NO_NODE;
+	seqcount_init(&p->mems_allowed_seq);
 #endif
 #ifdef CONFIG_TRACE_IRQFLAGS
 	p->irq_events = 0;
@@ -1340,7 +1360,13 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	clear_all_latency_tracing(p);
 
 	/* ok, now we should be set up.. */
-	p->exit_signal = (clone_flags & CLONE_THREAD) ? -1 : (clone_flags & CSIGNAL);
+	if (clone_flags & CLONE_THREAD)
+		p->exit_signal = -1;
+	else if (clone_flags & CLONE_PARENT)
+		p->exit_signal = current->group_leader->exit_signal;
+	else
+		p->exit_signal = (clone_flags & CSIGNAL);
+
 	p->pdeath_signal = 0;
 	p->exit_state = 0;
 
diff --git a/kernel/freezer.c b/kernel/freezer.c
index 9815b8d1eed5..11f82a4d4eae 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -99,9 +99,9 @@ static void fake_signal_wake_up(struct task_struct *p)
  * freeze_task - send a freeze request to given task
  * @p: task to send the request to
  *
- * If @p is freezing, the freeze request is sent by setting %TIF_FREEZE
- * flag and either sending a fake signal to it or waking it up, depending
- * on whether it has %PF_FREEZER_NOSIG set.
+ * If @p is freezing, the freeze request is sent either by sending a fake
+ * signal (if it's not a kernel thread) or waking it up (if it's a kernel
+ * thread).
  *
  * RETURNS:
  * %false, if @p is not freezing or already frozen; %true, otherwise
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 1f9e26526b69..af48e59bc2ff 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1,189 +1,793 @@
+#include <linux/debugfs.h>
+#include <linux/hardirq.h>
+#include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/irqdesc.h>
 #include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/seq_file.h>
 #include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/fs.h>
+
+#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
+				 * ie. legacy 8259, gets irqs 1..15 */
+#define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
+#define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
+#define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
 
 static LIST_HEAD(irq_domain_list);
 static DEFINE_MUTEX(irq_domain_mutex);
 
+static DEFINE_MUTEX(revmap_trees_mutex);
+static unsigned int irq_virq_count = NR_IRQS;
+static struct irq_domain *irq_default_domain;
+
 /**
- * irq_domain_add() - Register an irq_domain
- * @domain: ptr to initialized irq_domain structure
+ * irq_domain_alloc() - Allocate a new irq_domain data structure
+ * @of_node: optional device-tree node of the interrupt controller
+ * @revmap_type: type of reverse mapping to use
+ * @ops: map/unmap domain callbacks
+ * @host_data: Controller private data pointer
  *
- * Registers an irq_domain structure.  The irq_domain must at a minimum be
- * initialized with an ops structure pointer, and either a ->to_irq hook or
- * a valid irq_base value.  Everything else is optional.
+ * Allocates and initialize and irq_domain structure.  Caller is expected to
+ * register allocated irq_domain with irq_domain_register().  Returns pointer
+ * to IRQ domain, or NULL on failure.
  */
-void irq_domain_add(struct irq_domain *domain)
+static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
+					   unsigned int revmap_type,
+					   const struct irq_domain_ops *ops,
+					   void *host_data)
 {
-	struct irq_data *d;
-	int hwirq, irq;
+	struct irq_domain *domain;
 
-	/*
-	 * This assumes that the irq_domain owner has already allocated
-	 * the irq_descs.  This block will be removed when support for dynamic
-	 * allocation of irq_descs is added to irq_domain.
-	 */
-	irq_domain_for_each_irq(domain, hwirq, irq) {
-		d = irq_get_irq_data(irq);
-		if (!d) {
-			WARN(1, "error: assigning domain to non existant irq_desc");
-			return;
-		}
-		if (d->domain) {
-			/* things are broken; just report, don't clean up */
-			WARN(1, "error: irq_desc already assigned to a domain");
-			return;
+	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
+	if (WARN_ON(!domain))
+		return NULL;
+
+	/* Fill structure */
+	domain->revmap_type = revmap_type;
+	domain->ops = ops;
+	domain->host_data = host_data;
+	domain->of_node = of_node_get(of_node);
+
+	return domain;
+}
+
+static void irq_domain_add(struct irq_domain *domain)
+{
+	mutex_lock(&irq_domain_mutex);
+	list_add(&domain->link, &irq_domain_list);
+	mutex_unlock(&irq_domain_mutex);
+	pr_debug("irq: Allocated domain of type %d @0x%p\n",
+		 domain->revmap_type, domain);
+}
+
+static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
+					     irq_hw_number_t hwirq)
+{
+	irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
+	int size = domain->revmap_data.legacy.size;
+
+	if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
+		return 0;
+	return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
+}
+
+/**
+ * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
+ * @of_node: pointer to interrupt controller's device tree node.
+ * @size: total number of irqs in legacy mapping
+ * @first_irq: first number of irq block assigned to the domain
+ * @first_hwirq: first hwirq number to use for the translation. Should normally
+ *               be '0', but a positive integer can be used if the effective
+ *               hwirqs numbering does not begin at zero.
+ * @ops: map/unmap domain callbacks
+ * @host_data: Controller private data pointer
+ *
+ * Note: the map() callback will be called before this function returns
+ * for all legacy interrupts except 0 (which is always the invalid irq for
+ * a legacy controller).
+ */
+struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
+					 unsigned int size,
+					 unsigned int first_irq,
+					 irq_hw_number_t first_hwirq,
+					 const struct irq_domain_ops *ops,
+					 void *host_data)
+{
+	struct irq_domain *domain;
+	unsigned int i;
+
+	domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
+	if (!domain)
+		return NULL;
+
+	domain->revmap_data.legacy.first_irq = first_irq;
+	domain->revmap_data.legacy.first_hwirq = first_hwirq;
+	domain->revmap_data.legacy.size = size;
+
+	mutex_lock(&irq_domain_mutex);
+	/* Verify that all the irqs are available */
+	for (i = 0; i < size; i++) {
+		int irq = first_irq + i;
+		struct irq_data *irq_data = irq_get_irq_data(irq);
+
+		if (WARN_ON(!irq_data || irq_data->domain)) {
+			mutex_unlock(&irq_domain_mutex);
+			of_node_put(domain->of_node);
+			kfree(domain);
+			return NULL;
 		}
-		d->domain = domain;
-		d->hwirq = hwirq;
 	}
 
-	mutex_lock(&irq_domain_mutex);
-	list_add(&domain->list, &irq_domain_list);
+	/* Claim all of the irqs before registering a legacy domain */
+	for (i = 0; i < size; i++) {
+		struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
+		irq_data->hwirq = first_hwirq + i;
+		irq_data->domain = domain;
+	}
 	mutex_unlock(&irq_domain_mutex);
+
+	for (i = 0; i < size; i++) {
+		int irq = first_irq + i;
+		int hwirq = first_hwirq + i;
+
+		/* IRQ0 gets ignored */
+		if (!irq)
+			continue;
+
+		/* Legacy flags are left to default at this point,
+		 * one can then use irq_create_mapping() to
+		 * explicitly change them
+		 */
+		ops->map(domain, irq, hwirq);
+
+		/* Clear norequest flags */
+		irq_clear_status_flags(irq, IRQ_NOREQUEST);
+	}
+
+	irq_domain_add(domain);
+	return domain;
+}
+
+/**
+ * irq_domain_add_linear() - Allocate and register a legacy revmap irq_domain.
+ * @of_node: pointer to interrupt controller's device tree node.
+ * @ops: map/unmap domain callbacks
+ * @host_data: Controller private data pointer
+ */
+struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
+					 unsigned int size,
+					 const struct irq_domain_ops *ops,
+					 void *host_data)
+{
+	struct irq_domain *domain;
+	unsigned int *revmap;
+
+	revmap = kzalloc(sizeof(*revmap) * size, GFP_KERNEL);
+	if (WARN_ON(!revmap))
+		return NULL;
+
+	domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
+	if (!domain) {
+		kfree(revmap);
+		return NULL;
+	}
+	domain->revmap_data.linear.size = size;
+	domain->revmap_data.linear.revmap = revmap;
+	irq_domain_add(domain);
+	return domain;
+}
+
+struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
+					 const struct irq_domain_ops *ops,
+					 void *host_data)
+{
+	struct irq_domain *domain = irq_domain_alloc(of_node,
+					IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
+	if (domain)
+		irq_domain_add(domain);
+	return domain;
+}
+
+/**
+ * irq_domain_add_tree()
+ * @of_node: pointer to interrupt controller's device tree node.
+ * @ops: map/unmap domain callbacks
+ *
+ * Note: The radix tree will be allocated later during boot automatically
+ * (the reverse mapping will use the slow path until that happens).
+ */
+struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
+					 const struct irq_domain_ops *ops,
+					 void *host_data)
+{
+	struct irq_domain *domain = irq_domain_alloc(of_node,
+					IRQ_DOMAIN_MAP_TREE, ops, host_data);
+	if (domain) {
+		INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
+		irq_domain_add(domain);
+	}
+	return domain;
 }
 
 /**
- * irq_domain_del() - Unregister an irq_domain
- * @domain: ptr to registered irq_domain.
+ * irq_find_host() - Locates a domain for a given device node
+ * @node: device-tree node of the interrupt controller
  */
-void irq_domain_del(struct irq_domain *domain)
+struct irq_domain *irq_find_host(struct device_node *node)
 {
-	struct irq_data *d;
-	int hwirq, irq;
+	struct irq_domain *h, *found = NULL;
+	int rc;
 
+	/* We might want to match the legacy controller last since
+	 * it might potentially be set to match all interrupts in
+	 * the absence of a device node. This isn't a problem so far
+	 * yet though...
+	 */
 	mutex_lock(&irq_domain_mutex);
-	list_del(&domain->list);
+	list_for_each_entry(h, &irq_domain_list, link) {
+		if (h->ops->match)
+			rc = h->ops->match(h, node);
+		else
+			rc = (h->of_node != NULL) && (h->of_node == node);
+
+		if (rc) {
+			found = h;
+			break;
+		}
+	}
 	mutex_unlock(&irq_domain_mutex);
+	return found;
+}
+EXPORT_SYMBOL_GPL(irq_find_host);
+
+/**
+ * irq_set_default_host() - Set a "default" irq domain
+ * @domain: default domain pointer
+ *
+ * For convenience, it's possible to set a "default" domain that will be used
+ * whenever NULL is passed to irq_create_mapping(). It makes life easier for
+ * platforms that want to manipulate a few hard coded interrupt numbers that
+ * aren't properly represented in the device-tree.
+ */
+void irq_set_default_host(struct irq_domain *domain)
+{
+	pr_debug("irq: Default domain set to @0x%p\n", domain);
+
+	irq_default_domain = domain;
+}
+
+/**
+ * irq_set_virq_count() - Set the maximum number of linux irqs
+ * @count: number of linux irqs, capped with NR_IRQS
+ *
+ * This is mainly for use by platforms like iSeries who want to program
+ * the virtual irq number in the controller to avoid the reverse mapping
+ */
+void irq_set_virq_count(unsigned int count)
+{
+	pr_debug("irq: Trying to set virq count to %d\n", count);
 
-	/* Clear the irq_domain assignments */
-	irq_domain_for_each_irq(domain, hwirq, irq) {
-		d = irq_get_irq_data(irq);
-		d->domain = NULL;
+	BUG_ON(count < NUM_ISA_INTERRUPTS);
+	if (count < NR_IRQS)
+		irq_virq_count = count;
+}
+
+static int irq_setup_virq(struct irq_domain *domain, unsigned int virq,
+			    irq_hw_number_t hwirq)
+{
+	struct irq_data *irq_data = irq_get_irq_data(virq);
+
+	irq_data->hwirq = hwirq;
+	irq_data->domain = domain;
+	if (domain->ops->map(domain, virq, hwirq)) {
+		pr_debug("irq: -> mapping failed, freeing\n");
+		irq_data->domain = NULL;
+		irq_data->hwirq = 0;
+		return -1;
 	}
+
+	irq_clear_status_flags(virq, IRQ_NOREQUEST);
+
+	return 0;
 }
 
-#if defined(CONFIG_OF_IRQ)
 /**
- * irq_create_of_mapping() - Map a linux irq number from a DT interrupt spec
+ * irq_create_direct_mapping() - Allocate an irq for direct mapping
+ * @domain: domain to allocate the irq for or NULL for default domain
  *
- * Used by the device tree interrupt mapping code to translate a device tree
- * interrupt specifier to a valid linux irq number.  Returns either a valid
- * linux IRQ number or 0.
+ * This routine is used for irq controllers which can choose the hardware
+ * interrupt numbers they generate. In such a case it's simplest to use
+ * the linux irq as the hardware interrupt number.
+ */
+unsigned int irq_create_direct_mapping(struct irq_domain *domain)
+{
+	unsigned int virq;
+
+	if (domain == NULL)
+		domain = irq_default_domain;
+
+	BUG_ON(domain == NULL);
+	WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP);
+
+	virq = irq_alloc_desc_from(1, 0);
+	if (!virq) {
+		pr_debug("irq: create_direct virq allocation failed\n");
+		return 0;
+	}
+	if (virq >= irq_virq_count) {
+		pr_err("ERROR: no free irqs available below %i maximum\n",
+			irq_virq_count);
+		irq_free_desc(virq);
+		return 0;
+	}
+
+	pr_debug("irq: create_direct obtained virq %d\n", virq);
+
+	if (irq_setup_virq(domain, virq, virq)) {
+		irq_free_desc(virq);
+		return 0;
+	}
+
+	return virq;
+}
+
+/**
+ * irq_create_mapping() - Map a hardware interrupt into linux irq space
+ * @domain: domain owning this hardware interrupt or NULL for default domain
+ * @hwirq: hardware irq number in that domain space
  *
- * When the caller no longer need the irq number returned by this function it
- * should arrange to call irq_dispose_mapping().
+ * Only one mapping per hardware interrupt is permitted. Returns a linux
+ * irq number.
+ * If the sense/trigger is to be specified, set_irq_type() should be called
+ * on the number returned from that call.
  */
+unsigned int irq_create_mapping(struct irq_domain *domain,
+				irq_hw_number_t hwirq)
+{
+	unsigned int virq, hint;
+
+	pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
+
+	/* Look for default domain if nececssary */
+	if (domain == NULL)
+		domain = irq_default_domain;
+	if (domain == NULL) {
+		printk(KERN_WARNING "irq_create_mapping called for"
+		       " NULL domain, hwirq=%lx\n", hwirq);
+		WARN_ON(1);
+		return 0;
+	}
+	pr_debug("irq: -> using domain @%p\n", domain);
+
+	/* Check if mapping already exists */
+	virq = irq_find_mapping(domain, hwirq);
+	if (virq) {
+		pr_debug("irq: -> existing mapping on virq %d\n", virq);
+		return virq;
+	}
+
+	/* Get a virtual interrupt number */
+	if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
+		return irq_domain_legacy_revmap(domain, hwirq);
+
+	/* Allocate a virtual interrupt number */
+	hint = hwirq % irq_virq_count;
+	if (hint == 0)
+		hint++;
+	virq = irq_alloc_desc_from(hint, 0);
+	if (!virq)
+		virq = irq_alloc_desc_from(1, 0);
+	if (!virq) {
+		pr_debug("irq: -> virq allocation failed\n");
+		return 0;
+	}
+
+	if (irq_setup_virq(domain, virq, hwirq)) {
+		if (domain->revmap_type != IRQ_DOMAIN_MAP_LEGACY)
+			irq_free_desc(virq);
+		return 0;
+	}
+
+	pr_debug("irq: irq %lu on domain %s mapped to virtual irq %u\n",
+		hwirq, domain->of_node ? domain->of_node->full_name : "null", virq);
+
+	return virq;
+}
+EXPORT_SYMBOL_GPL(irq_create_mapping);
+
 unsigned int irq_create_of_mapping(struct device_node *controller,
 				   const u32 *intspec, unsigned int intsize)
 {
 	struct irq_domain *domain;
-	unsigned long hwirq;
-	unsigned int irq, type;
-	int rc = -EINVAL;
+	irq_hw_number_t hwirq;
+	unsigned int type = IRQ_TYPE_NONE;
+	unsigned int virq;
 
-	/* Find a domain which can translate the irq spec */
-	mutex_lock(&irq_domain_mutex);
-	list_for_each_entry(domain, &irq_domain_list, list) {
-		if (!domain->ops->dt_translate)
-			continue;
-		rc = domain->ops->dt_translate(domain, controller,
-					intspec, intsize, &hwirq, &type);
-		if (rc == 0)
-			break;
+	domain = controller ? irq_find_host(controller) : irq_default_domain;
+	if (!domain) {
+#ifdef CONFIG_MIPS
+		/*
+		 * Workaround to avoid breaking interrupt controller drivers
+		 * that don't yet register an irq_domain.  This is temporary
+		 * code. ~~~gcl, Feb 24, 2012
+		 *
+		 * Scheduled for removal in Linux v3.6.  That should be enough
+		 * time.
+		 */
+		if (intsize > 0)
+			return intspec[0];
+#endif
+		printk(KERN_WARNING "irq: no irq domain found for %s !\n",
+		       controller->full_name);
+		return 0;
 	}
-	mutex_unlock(&irq_domain_mutex);
 
-	if (rc != 0)
-		return 0;
+	/* If domain has no translation, then we assume interrupt line */
+	if (domain->ops->xlate == NULL)
+		hwirq = intspec[0];
+	else {
+		if (domain->ops->xlate(domain, controller, intspec, intsize,
+				     &hwirq, &type))
+			return 0;
+	}
+
+	/* Create mapping */
+	virq = irq_create_mapping(domain, hwirq);
+	if (!virq)
+		return virq;
 
-	irq = irq_domain_to_irq(domain, hwirq);
-	if (type != IRQ_TYPE_NONE)
-		irq_set_irq_type(irq, type);
-	pr_debug("%s: mapped hwirq=%i to irq=%i, flags=%x\n",
-		 controller->full_name, (int)hwirq, irq, type);
-	return irq;
+	/* Set type if specified and different than the current one */
+	if (type != IRQ_TYPE_NONE &&
+	    type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
+		irq_set_irq_type(virq, type);
+	return virq;
 }
 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
 
 /**
- * irq_dispose_mapping() - Discard a mapping created by irq_create_of_mapping()
- * @irq: linux irq number to be discarded
+ * irq_dispose_mapping() - Unmap an interrupt
+ * @virq: linux irq number of the interrupt to unmap
+ */
+void irq_dispose_mapping(unsigned int virq)
+{
+	struct irq_data *irq_data = irq_get_irq_data(virq);
+	struct irq_domain *domain;
+	irq_hw_number_t hwirq;
+
+	if (!virq || !irq_data)
+		return;
+
+	domain = irq_data->domain;
+	if (WARN_ON(domain == NULL))
+		return;
+
+	/* Never unmap legacy interrupts */
+	if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
+		return;
+
+	irq_set_status_flags(virq, IRQ_NOREQUEST);
+
+	/* remove chip and handler */
+	irq_set_chip_and_handler(virq, NULL, NULL);
+
+	/* Make sure it's completed */
+	synchronize_irq(virq);
+
+	/* Tell the PIC about it */
+	if (domain->ops->unmap)
+		domain->ops->unmap(domain, virq);
+	smp_mb();
+
+	/* Clear reverse map */
+	hwirq = irq_data->hwirq;
+	switch(domain->revmap_type) {
+	case IRQ_DOMAIN_MAP_LINEAR:
+		if (hwirq < domain->revmap_data.linear.size)
+			domain->revmap_data.linear.revmap[hwirq] = 0;
+		break;
+	case IRQ_DOMAIN_MAP_TREE:
+		mutex_lock(&revmap_trees_mutex);
+		radix_tree_delete(&domain->revmap_data.tree, hwirq);
+		mutex_unlock(&revmap_trees_mutex);
+		break;
+	}
+
+	irq_free_desc(virq);
+}
+EXPORT_SYMBOL_GPL(irq_dispose_mapping);
+
+/**
+ * irq_find_mapping() - Find a linux irq from an hw irq number.
+ * @domain: domain owning this hardware interrupt
+ * @hwirq: hardware irq number in that domain space
+ *
+ * This is a slow path, for use by generic code. It's expected that an
+ * irq controller implementation directly calls the appropriate low level
+ * mapping function.
+ */
+unsigned int irq_find_mapping(struct irq_domain *domain,
+			      irq_hw_number_t hwirq)
+{
+	unsigned int i;
+	unsigned int hint = hwirq % irq_virq_count;
+
+	/* Look for default domain if nececssary */
+	if (domain == NULL)
+		domain = irq_default_domain;
+	if (domain == NULL)
+		return 0;
+
+	/* legacy -> bail early */
+	if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
+		return irq_domain_legacy_revmap(domain, hwirq);
+
+	/* Slow path does a linear search of the map */
+	if (hint == 0)
+		hint = 1;
+	i = hint;
+	do {
+		struct irq_data *data = irq_get_irq_data(i);
+		if (data && (data->domain == domain) && (data->hwirq == hwirq))
+			return i;
+		i++;
+		if (i >= irq_virq_count)
+			i = 1;
+	} while(i != hint);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(irq_find_mapping);
+
+/**
+ * irq_radix_revmap_lookup() - Find a linux irq from a hw irq number.
+ * @domain: domain owning this hardware interrupt
+ * @hwirq: hardware irq number in that domain space
  *
- * Calling this function indicates the caller no longer needs a reference to
- * the linux irq number returned by a prior call to irq_create_of_mapping().
+ * This is a fast path, for use by irq controller code that uses radix tree
+ * revmaps
  */
-void irq_dispose_mapping(unsigned int irq)
+unsigned int irq_radix_revmap_lookup(struct irq_domain *domain,
+				     irq_hw_number_t hwirq)
 {
+	struct irq_data *irq_data;
+
+	if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
+		return irq_find_mapping(domain, hwirq);
+
+	/*
+	 * Freeing an irq can delete nodes along the path to
+	 * do the lookup via call_rcu.
+	 */
+	rcu_read_lock();
+	irq_data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
+	rcu_read_unlock();
+
 	/*
-	 * nothing yet; will be filled when support for dynamic allocation of
-	 * irq_descs is added to irq_domain
+	 * If found in radix tree, then fine.
+	 * Else fallback to linear lookup - this should not happen in practice
+	 * as it means that we failed to insert the node in the radix tree.
 	 */
+	return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq);
 }
-EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 
-int irq_domain_simple_dt_translate(struct irq_domain *d,
-			    struct device_node *controller,
-			    const u32 *intspec, unsigned int intsize,
-			    unsigned long *out_hwirq, unsigned int *out_type)
+/**
+ * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping.
+ * @domain: domain owning this hardware interrupt
+ * @virq: linux irq number
+ * @hwirq: hardware irq number in that domain space
+ *
+ * This is for use by irq controllers that use a radix tree reverse
+ * mapping for fast lookup.
+ */
+void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq,
+			     irq_hw_number_t hwirq)
 {
-	if (d->of_node != controller)
-		return -EINVAL;
-	if (intsize < 1)
-		return -EINVAL;
-	if (d->nr_irq && ((intspec[0] < d->hwirq_base) ||
-	    (intspec[0] >= d->hwirq_base + d->nr_irq)))
-		return -EINVAL;
+	struct irq_data *irq_data = irq_get_irq_data(virq);
+
+	if (WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
+		return;
+
+	if (virq) {
+		mutex_lock(&revmap_trees_mutex);
+		radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
+		mutex_unlock(&revmap_trees_mutex);
+	}
+}
+
+/**
+ * irq_linear_revmap() - Find a linux irq from a hw irq number.
+ * @domain: domain owning this hardware interrupt
+ * @hwirq: hardware irq number in that domain space
+ *
+ * This is a fast path, for use by irq controller code that uses linear
+ * revmaps. It does fallback to the slow path if the revmap doesn't exist
+ * yet and will create the revmap entry with appropriate locking
+ */
+unsigned int irq_linear_revmap(struct irq_domain *domain,
+			       irq_hw_number_t hwirq)
+{
+	unsigned int *revmap;
+
+	if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR))
+		return irq_find_mapping(domain, hwirq);
+
+	/* Check revmap bounds */
+	if (unlikely(hwirq >= domain->revmap_data.linear.size))
+		return irq_find_mapping(domain, hwirq);
+
+	/* Check if revmap was allocated */
+	revmap = domain->revmap_data.linear.revmap;
+	if (unlikely(revmap == NULL))
+		return irq_find_mapping(domain, hwirq);
+
+	/* Fill up revmap with slow path if no mapping found */
+	if (unlikely(!revmap[hwirq]))
+		revmap[hwirq] = irq_find_mapping(domain, hwirq);
+
+	return revmap[hwirq];
+}
+
+#ifdef CONFIG_VIRQ_DEBUG
+static int virq_debug_show(struct seq_file *m, void *private)
+{
+	unsigned long flags;
+	struct irq_desc *desc;
+	const char *p;
+	static const char none[] = "none";
+	void *data;
+	int i;
+
+	seq_printf(m, "%-5s  %-7s  %-15s  %-18s  %s\n", "virq", "hwirq",
+		      "chip name", "chip data", "domain name");
+
+	for (i = 1; i < nr_irqs; i++) {
+		desc = irq_to_desc(i);
+		if (!desc)
+			continue;
+
+		raw_spin_lock_irqsave(&desc->lock, flags);
+
+		if (desc->action && desc->action->handler) {
+			struct irq_chip *chip;
+
+			seq_printf(m, "%5d  ", i);
+			seq_printf(m, "0x%05lx  ", desc->irq_data.hwirq);
+
+			chip = irq_desc_get_chip(desc);
+			if (chip && chip->name)
+				p = chip->name;
+			else
+				p = none;
+			seq_printf(m, "%-15s  ", p);
+
+			data = irq_desc_get_chip_data(desc);
+			seq_printf(m, "0x%16p  ", data);
+
+			if (desc->irq_data.domain->of_node)
+				p = desc->irq_data.domain->of_node->full_name;
+			else
+				p = none;
+			seq_printf(m, "%s\n", p);
+		}
+
+		raw_spin_unlock_irqrestore(&desc->lock, flags);
+	}
+
+	return 0;
+}
 
+static int virq_debug_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, virq_debug_show, inode->i_private);
+}
+
+static const struct file_operations virq_debug_fops = {
+	.open = virq_debug_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static int __init irq_debugfs_init(void)
+{
+	if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root,
+				 NULL, &virq_debug_fops) == NULL)
+		return -ENOMEM;
+
+	return 0;
+}
+__initcall(irq_debugfs_init);
+#endif /* CONFIG_VIRQ_DEBUG */
+
+int irq_domain_simple_map(struct irq_domain *d, unsigned int irq,
+			  irq_hw_number_t hwirq)
+{
+	return 0;
+}
+
+/**
+ * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
+ *
+ * Device Tree IRQ specifier translation function which works with one cell
+ * bindings where the cell value maps directly to the hwirq number.
+ */
+int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
+			     const u32 *intspec, unsigned int intsize,
+			     unsigned long *out_hwirq, unsigned int *out_type)
+{
+	if (WARN_ON(intsize < 1))
+		return -EINVAL;
 	*out_hwirq = intspec[0];
 	*out_type = IRQ_TYPE_NONE;
-	if (intsize > 1)
-		*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
 	return 0;
 }
+EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
 
 /**
- * irq_domain_create_simple() - Set up a 'simple' translation range
+ * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
+ *
+ * Device Tree IRQ specifier translation function which works with two cell
+ * bindings where the cell values map directly to the hwirq number
+ * and linux irq flags.
  */
-void irq_domain_add_simple(struct device_node *controller, int irq_base)
+int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
+			const u32 *intspec, unsigned int intsize,
+			irq_hw_number_t *out_hwirq, unsigned int *out_type)
 {
-	struct irq_domain *domain;
-
-	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
-	if (!domain) {
-		WARN_ON(1);
-		return;
-	}
+	if (WARN_ON(intsize < 2))
+		return -EINVAL;
+	*out_hwirq = intspec[0];
+	*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
 
-	domain->irq_base = irq_base;
-	domain->of_node = of_node_get(controller);
-	domain->ops = &irq_domain_simple_ops;
-	irq_domain_add(domain);
+/**
+ * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
+ *
+ * Device Tree IRQ specifier translation function which works with either one
+ * or two cell bindings where the cell values map directly to the hwirq number
+ * and linux irq flags.
+ *
+ * Note: don't use this function unless your interrupt controller explicitly
+ * supports both one and two cell bindings.  For the majority of controllers
+ * the _onecell() or _twocell() variants above should be used.
+ */
+int irq_domain_xlate_onetwocell(struct irq_domain *d,
+				struct device_node *ctrlr,
+				const u32 *intspec, unsigned int intsize,
+				unsigned long *out_hwirq, unsigned int *out_type)
+{
+	if (WARN_ON(intsize < 1))
+		return -EINVAL;
+	*out_hwirq = intspec[0];
+	*out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
+	return 0;
 }
-EXPORT_SYMBOL_GPL(irq_domain_add_simple);
+EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
 
+const struct irq_domain_ops irq_domain_simple_ops = {
+	.map = irq_domain_simple_map,
+	.xlate = irq_domain_xlate_onetwocell,
+};
+EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
+
+#ifdef CONFIG_OF_IRQ
 void irq_domain_generate_simple(const struct of_device_id *match,
 				u64 phys_base, unsigned int irq_start)
 {
 	struct device_node *node;
-	pr_info("looking for phys_base=%llx, irq_start=%i\n",
+	pr_debug("looking for phys_base=%llx, irq_start=%i\n",
 		(unsigned long long) phys_base, (int) irq_start);
 	node = of_find_matching_node_by_address(NULL, match, phys_base);
 	if (node)
-		irq_domain_add_simple(node, irq_start);
-	else
-		pr_info("no node found\n");
+		irq_domain_add_legacy(node, 32, irq_start, 0,
+				      &irq_domain_simple_ops, NULL);
 }
 EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
-#endif /* CONFIG_OF_IRQ */
-
-struct irq_domain_ops irq_domain_simple_ops = {
-#ifdef CONFIG_OF_IRQ
-	.dt_translate = irq_domain_simple_dt_translate,
-#endif /* CONFIG_OF_IRQ */
-};
-EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
+#endif
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 7b0886786701..a6a675cb9818 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1546,13 +1546,13 @@ int kernel_kexec(void)
 		if (error)
 			goto Resume_console;
 		/* At this point, dpm_suspend_start() has been called,
-		 * but *not* dpm_suspend_noirq(). We *must* call
-		 * dpm_suspend_noirq() now.  Otherwise, drivers for
+		 * but *not* dpm_suspend_end(). We *must* call
+		 * dpm_suspend_end() now.  Otherwise, drivers for
 		 * some devices (e.g. interrupt controllers) become
 		 * desynchronized with the actual state of the
 		 * hardware at resume time, and evil weirdness ensues.
 		 */
-		error = dpm_suspend_noirq(PMSG_FREEZE);
+		error = dpm_suspend_end(PMSG_FREEZE);
 		if (error)
 			goto Resume_devices;
 		error = disable_nonboot_cpus();
@@ -1579,7 +1579,7 @@ int kernel_kexec(void)
 		local_irq_enable();
  Enable_cpus:
 		enable_nonboot_cpus();
-		dpm_resume_noirq(PMSG_RESTORE);
+		dpm_resume_start(PMSG_RESTORE);
  Resume_devices:
 		dpm_resume_end(PMSG_RESTORE);
  Resume_console:
diff --git a/kernel/kmod.c b/kernel/kmod.c
index a0a88543934e..957a7aab8ebc 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -60,6 +60,43 @@ static DECLARE_RWSEM(umhelper_sem);
 */
 char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
 
+static void free_modprobe_argv(struct subprocess_info *info)
+{
+	kfree(info->argv[3]); /* check call_modprobe() */
+	kfree(info->argv);
+}
+
+static int call_modprobe(char *module_name, int wait)
+{
+	static char *envp[] = {
+		"HOME=/",
+		"TERM=linux",
+		"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
+		NULL
+	};
+
+	char **argv = kmalloc(sizeof(char *[5]), GFP_KERNEL);
+	if (!argv)
+		goto out;
+
+	module_name = kstrdup(module_name, GFP_KERNEL);
+	if (!module_name)
+		goto free_argv;
+
+	argv[0] = modprobe_path;
+	argv[1] = "-q";
+	argv[2] = "--";
+	argv[3] = module_name;	/* check free_modprobe_argv() */
+	argv[4] = NULL;
+
+	return call_usermodehelper_fns(modprobe_path, argv, envp,
+		wait | UMH_KILLABLE, NULL, free_modprobe_argv, NULL);
+free_argv:
+	kfree(argv);
+out:
+	return -ENOMEM;
+}
+
 /**
  * __request_module - try to load a kernel module
  * @wait: wait (or not) for the operation to complete
@@ -81,11 +118,6 @@ int __request_module(bool wait, const char *fmt, ...)
 	char module_name[MODULE_NAME_LEN];
 	unsigned int max_modprobes;
 	int ret;
-	char *argv[] = { modprobe_path, "-q", "--", module_name, NULL };
-	static char *envp[] = { "HOME=/",
-				"TERM=linux",
-				"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
-				NULL };
 	static atomic_t kmod_concurrent = ATOMIC_INIT(0);
 #define MAX_KMOD_CONCURRENT 50	/* Completely arbitrary value - KAO */
 	static int kmod_loop_msg;
@@ -128,9 +160,7 @@ int __request_module(bool wait, const char *fmt, ...)
 
 	trace_module_request(module_name, wait, _RET_IP_);
 
-	ret = call_usermodehelper_fns(modprobe_path, argv, envp,
-			wait ? UMH_WAIT_PROC : UMH_WAIT_EXEC,
-			NULL, NULL, NULL);
+	ret = call_modprobe(module_name, wait ? UMH_WAIT_PROC : UMH_WAIT_EXEC);
 
 	atomic_dec(&kmod_concurrent);
 	return ret;
@@ -188,7 +218,7 @@ static int ____call_usermodehelper(void *data)
 	/* Exec failed? */
 fail:
 	sub_info->retval = retval;
-	do_exit(0);
+	return 0;
 }
 
 void call_usermodehelper_freeinfo(struct subprocess_info *info)
@@ -199,6 +229,19 @@ void call_usermodehelper_freeinfo(struct subprocess_info *info)
 }
 EXPORT_SYMBOL(call_usermodehelper_freeinfo);
 
+static void umh_complete(struct subprocess_info *sub_info)
+{
+	struct completion *comp = xchg(&sub_info->complete, NULL);
+	/*
+	 * See call_usermodehelper_exec(). If xchg() returns NULL
+	 * we own sub_info, the UMH_KILLABLE caller has gone away.
+	 */
+	if (comp)
+		complete(comp);
+	else
+		call_usermodehelper_freeinfo(sub_info);
+}
+
 /* Keventd can't block, but this (a child) can. */
 static int wait_for_helper(void *data)
 {
@@ -235,7 +278,7 @@ static int wait_for_helper(void *data)
 			sub_info->retval = ret;
 	}
 
-	complete(sub_info->complete);
+	umh_complete(sub_info);
 	return 0;
 }
 
@@ -244,7 +287,7 @@ static void __call_usermodehelper(struct work_struct *work)
 {
 	struct subprocess_info *sub_info =
 		container_of(work, struct subprocess_info, work);
-	enum umh_wait wait = sub_info->wait;
+	int wait = sub_info->wait & ~UMH_KILLABLE;
 	pid_t pid;
 
 	/* CLONE_VFORK: wait until the usermode helper has execve'd
@@ -269,7 +312,7 @@ static void __call_usermodehelper(struct work_struct *work)
 	case UMH_WAIT_EXEC:
 		if (pid < 0)
 			sub_info->retval = pid;
-		complete(sub_info->complete);
+		umh_complete(sub_info);
 	}
 }
 
@@ -435,8 +478,7 @@ EXPORT_SYMBOL(call_usermodehelper_setfns);
  * asynchronously if wait is not set, and runs as a child of keventd.
  * (ie. it runs with full root capabilities).
  */
-int call_usermodehelper_exec(struct subprocess_info *sub_info,
-			     enum umh_wait wait)
+int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
 {
 	DECLARE_COMPLETION_ONSTACK(done);
 	int retval = 0;
@@ -456,9 +498,21 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info,
 	queue_work(khelper_wq, &sub_info->work);
 	if (wait == UMH_NO_WAIT)	/* task has freed sub_info */
 		goto unlock;
+
+	if (wait & UMH_KILLABLE) {
+		retval = wait_for_completion_killable(&done);
+		if (!retval)
+			goto wait_done;
+
+		/* umh_complete() will see NULL and free sub_info */
+		if (xchg(&sub_info->complete, NULL))
+			goto unlock;
+		/* fallthrough, umh_complete() was already called */
+	}
+
 	wait_for_completion(&done);
+wait_done:
 	retval = sub_info->retval;
-
 out:
 	call_usermodehelper_freeinfo(sub_info);
 unlock:
diff --git a/kernel/padata.c b/kernel/padata.c
index b45259931512..6f10eb285ece 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -29,7 +29,6 @@
 #include <linux/sysfs.h>
 #include <linux/rcupdate.h>
 
-#define MAX_SEQ_NR (INT_MAX - NR_CPUS)
 #define MAX_OBJ_NUM 1000
 
 static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index)
@@ -43,18 +42,19 @@ static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index)
 	return target_cpu;
 }
 
-static int padata_cpu_hash(struct padata_priv *padata)
+static int padata_cpu_hash(struct parallel_data *pd)
 {
 	int cpu_index;
-	struct parallel_data *pd;
-
-	pd =  padata->pd;
 
 	/*
 	 * Hash the sequence numbers to the cpus by taking
 	 * seq_nr mod. number of cpus in use.
 	 */
-	cpu_index =  padata->seq_nr % cpumask_weight(pd->cpumask.pcpu);
+
+	spin_lock(&pd->seq_lock);
+	cpu_index =  pd->seq_nr % cpumask_weight(pd->cpumask.pcpu);
+	pd->seq_nr++;
+	spin_unlock(&pd->seq_lock);
 
 	return padata_index_to_cpu(pd, cpu_index);
 }
@@ -132,12 +132,7 @@ int padata_do_parallel(struct padata_instance *pinst,
 	padata->pd = pd;
 	padata->cb_cpu = cb_cpu;
 
-	if (unlikely(atomic_read(&pd->seq_nr) == pd->max_seq_nr))
-		atomic_set(&pd->seq_nr, -1);
-
-	padata->seq_nr = atomic_inc_return(&pd->seq_nr);
-
-	target_cpu = padata_cpu_hash(padata);
+	target_cpu = padata_cpu_hash(pd);
 	queue = per_cpu_ptr(pd->pqueue, target_cpu);
 
 	spin_lock(&queue->parallel.lock);
@@ -173,7 +168,7 @@ EXPORT_SYMBOL(padata_do_parallel);
 static struct padata_priv *padata_get_next(struct parallel_data *pd)
 {
 	int cpu, num_cpus;
-	int next_nr, next_index;
+	unsigned int next_nr, next_index;
 	struct padata_parallel_queue *queue, *next_queue;
 	struct padata_priv *padata;
 	struct padata_list *reorder;
@@ -189,14 +184,6 @@ static struct padata_priv *padata_get_next(struct parallel_data *pd)
 	cpu = padata_index_to_cpu(pd, next_index);
 	next_queue = per_cpu_ptr(pd->pqueue, cpu);
 
-	if (unlikely(next_nr > pd->max_seq_nr)) {
-		next_nr = next_nr - pd->max_seq_nr - 1;
-		next_index = next_nr % num_cpus;
-		cpu = padata_index_to_cpu(pd, next_index);
-		next_queue = per_cpu_ptr(pd->pqueue, cpu);
-		pd->processed = 0;
-	}
-
 	padata = NULL;
 
 	reorder = &next_queue->reorder;
@@ -205,8 +192,6 @@ static struct padata_priv *padata_get_next(struct parallel_data *pd)
 		padata = list_entry(reorder->list.next,
 				    struct padata_priv, list);
 
-		BUG_ON(next_nr != padata->seq_nr);
-
 		spin_lock(&reorder->lock);
 		list_del_init(&padata->list);
 		atomic_dec(&pd->reorder_objects);
@@ -230,6 +215,7 @@ out:
 
 static void padata_reorder(struct parallel_data *pd)
 {
+	int cb_cpu;
 	struct padata_priv *padata;
 	struct padata_serial_queue *squeue;
 	struct padata_instance *pinst = pd->pinst;
@@ -270,13 +256,14 @@ static void padata_reorder(struct parallel_data *pd)
 			return;
 		}
 
-		squeue = per_cpu_ptr(pd->squeue, padata->cb_cpu);
+		cb_cpu = padata->cb_cpu;
+		squeue = per_cpu_ptr(pd->squeue, cb_cpu);
 
 		spin_lock(&squeue->serial.lock);
 		list_add_tail(&padata->list, &squeue->serial.list);
 		spin_unlock(&squeue->serial.lock);
 
-		queue_work_on(padata->cb_cpu, pinst->wq, &squeue->work);
+		queue_work_on(cb_cpu, pinst->wq, &squeue->work);
 	}
 
 	spin_unlock_bh(&pd->lock);
@@ -400,7 +387,7 @@ static void padata_init_squeues(struct parallel_data *pd)
 /* Initialize all percpu queues used by parallel workers */
 static void padata_init_pqueues(struct parallel_data *pd)
 {
-	int cpu_index, num_cpus, cpu;
+	int cpu_index, cpu;
 	struct padata_parallel_queue *pqueue;
 
 	cpu_index = 0;
@@ -415,9 +402,6 @@ static void padata_init_pqueues(struct parallel_data *pd)
 		INIT_WORK(&pqueue->work, padata_parallel_worker);
 		atomic_set(&pqueue->num_obj, 0);
 	}
-
-	num_cpus = cpumask_weight(pd->cpumask.pcpu);
-	pd->max_seq_nr = num_cpus ? (MAX_SEQ_NR / num_cpus) * num_cpus - 1 : 0;
 }
 
 /* Allocate and initialize the internal cpumask dependend resources. */
@@ -444,7 +428,7 @@ static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
 	padata_init_pqueues(pd);
 	padata_init_squeues(pd);
 	setup_timer(&pd->timer, padata_reorder_timer, (unsigned long)pd);
-	atomic_set(&pd->seq_nr, -1);
+	pd->seq_nr = 0;
 	atomic_set(&pd->reorder_objects, 0);
 	atomic_set(&pd->refcnt, 0);
 	pd->pinst = pinst;
diff --git a/kernel/params.c b/kernel/params.c
index 4bc965d8a1fe..47f5bf12434a 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -15,7 +15,6 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
-#include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/errno.h>
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index a8968396046d..17b232869a04 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -168,13 +168,9 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 	while (nr > 0) {
 		rcu_read_lock();
 
-		/*
-		 * Any nested-container's init processes won't ignore the
-		 * SEND_SIG_NOINFO signal, see send_signal()->si_fromuser().
-		 */
 		task = pid_task(find_vpid(nr), PIDTYPE_PID);
-		if (task)
-			send_sig_info(SIGKILL, SEND_SIG_NOINFO, task);
+		if (task && !__fatal_signal_pending(task))
+			send_sig_info(SIGKILL, SEND_SIG_FORCED, task);
 
 		rcu_read_unlock();
 
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 07e0e28ffba7..66d808ec5252 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -1,7 +1,8 @@
 
 ccflags-$(CONFIG_PM_DEBUG)	:= -DDEBUG
 
-obj-$(CONFIG_PM)		+= main.o qos.o
+obj-y				+= qos.o
+obj-$(CONFIG_PM)		+= main.o
 obj-$(CONFIG_VT_CONSOLE_SLEEP)	+= console.o
 obj-$(CONFIG_FREEZER)		+= process.o
 obj-$(CONFIG_SUSPEND)		+= suspend.o
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 6d6d28870335..0a186cfde788 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -245,8 +245,8 @@ void swsusp_show_speed(struct timeval *start, struct timeval *stop,
  * create_image - Create a hibernation image.
  * @platform_mode: Whether or not to use the platform driver.
  *
- * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image
- * and execute the drivers' .thaw_noirq() callbacks.
+ * Execute device drivers' "late" and "noirq" freeze callbacks, create a
+ * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
  *
  * Control reappears in this routine after the subsequent restore.
  */
@@ -254,7 +254,7 @@ static int create_image(int platform_mode)
 {
 	int error;
 
-	error = dpm_suspend_noirq(PMSG_FREEZE);
+	error = dpm_suspend_end(PMSG_FREEZE);
 	if (error) {
 		printk(KERN_ERR "PM: Some devices failed to power down, "
 			"aborting hibernation\n");
@@ -306,7 +306,7 @@ static int create_image(int platform_mode)
  Platform_finish:
 	platform_finish(platform_mode);
 
-	dpm_resume_noirq(in_suspend ?
+	dpm_resume_start(in_suspend ?
 		(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
 
 	return error;
@@ -343,13 +343,13 @@ int hibernation_snapshot(int platform_mode)
 		 * successful freezer test.
 		 */
 		freezer_test_done = true;
-		goto Cleanup;
+		goto Thaw;
 	}
 
 	error = dpm_prepare(PMSG_FREEZE);
 	if (error) {
 		dpm_complete(PMSG_RECOVER);
-		goto Cleanup;
+		goto Thaw;
 	}
 
 	suspend_console();
@@ -385,6 +385,8 @@ int hibernation_snapshot(int platform_mode)
 	platform_end(platform_mode);
 	return error;
 
+ Thaw:
+	thaw_kernel_threads();
  Cleanup:
 	swsusp_free();
 	goto Close;
@@ -394,16 +396,16 @@ int hibernation_snapshot(int platform_mode)
  * resume_target_kernel - Restore system state from a hibernation image.
  * @platform_mode: Whether or not to use the platform driver.
  *
- * Execute device drivers' .freeze_noirq() callbacks, restore the contents of
- * highmem that have not been restored yet from the image and run the low-level
- * code that will restore the remaining contents of memory and switch to the
- * just restored target kernel.
+ * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
+ * contents of highmem that have not been restored yet from the image and run
+ * the low-level code that will restore the remaining contents of memory and
+ * switch to the just restored target kernel.
  */
 static int resume_target_kernel(bool platform_mode)
 {
 	int error;
 
-	error = dpm_suspend_noirq(PMSG_QUIESCE);
+	error = dpm_suspend_end(PMSG_QUIESCE);
 	if (error) {
 		printk(KERN_ERR "PM: Some devices failed to power down, "
 			"aborting resume\n");
@@ -460,7 +462,7 @@ static int resume_target_kernel(bool platform_mode)
  Cleanup:
 	platform_restore_cleanup(platform_mode);
 
-	dpm_resume_noirq(PMSG_RECOVER);
+	dpm_resume_start(PMSG_RECOVER);
 
 	return error;
 }
@@ -518,7 +520,7 @@ int hibernation_platform_enter(void)
 		goto Resume_devices;
 	}
 
-	error = dpm_suspend_noirq(PMSG_HIBERNATE);
+	error = dpm_suspend_end(PMSG_HIBERNATE);
 	if (error)
 		goto Resume_devices;
 
@@ -549,7 +551,7 @@ int hibernation_platform_enter(void)
  Platform_finish:
 	hibernation_ops->finish();
 
-	dpm_resume_noirq(PMSG_RESTORE);
+	dpm_resume_start(PMSG_RESTORE);
 
  Resume_devices:
 	entering_platform_hibernation = false;
@@ -616,7 +618,7 @@ int hibernate(void)
 	/* Allocate memory management structures */
 	error = create_basic_memory_bitmaps();
 	if (error)
-		goto Exit;
+		goto Enable_umh;
 
 	printk(KERN_INFO "PM: Syncing filesystems ... ");
 	sys_sync();
@@ -624,15 +626,11 @@ int hibernate(void)
 
 	error = freeze_processes();
 	if (error)
-		goto Finish;
+		goto Free_bitmaps;
 
 	error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
-	if (error)
-		goto Thaw;
-	if (freezer_test_done) {
-		freezer_test_done = false;
+	if (error || freezer_test_done)
 		goto Thaw;
-	}
 
 	if (in_suspend) {
 		unsigned int flags = 0;
@@ -657,8 +655,13 @@ int hibernate(void)
 
  Thaw:
 	thaw_processes();
- Finish:
+
+	/* Don't bother checking whether freezer_test_done is true */
+	freezer_test_done = false;
+
+ Free_bitmaps:
 	free_basic_memory_bitmaps();
+ Enable_umh:
 	usermodehelper_enable();
  Exit:
 	pm_notifier_call_chain(PM_POST_HIBERNATION);
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 9824b41e5a18..1c12581f1c62 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -165,16 +165,20 @@ static int suspend_stats_show(struct seq_file *s, void *unused)
 	last_errno %= REC_FAILED_NUM;
 	last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1;
 	last_step %= REC_FAILED_NUM;
-	seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n"
-			"%s: %d\n%s: %d\n%s: %d\n%s: %d\n",
+	seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n"
+			"%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n",
 			"success", suspend_stats.success,
 			"fail", suspend_stats.fail,
 			"failed_freeze", suspend_stats.failed_freeze,
 			"failed_prepare", suspend_stats.failed_prepare,
 			"failed_suspend", suspend_stats.failed_suspend,
+			"failed_suspend_late",
+				suspend_stats.failed_suspend_late,
 			"failed_suspend_noirq",
 				suspend_stats.failed_suspend_noirq,
 			"failed_resume", suspend_stats.failed_resume,
+			"failed_resume_early",
+				suspend_stats.failed_resume_early,
 			"failed_resume_noirq",
 				suspend_stats.failed_resume_noirq);
 	seq_printf(s,	"failures:\n  last_failed_dev:\t%-s\n",
@@ -287,16 +291,10 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 
 #ifdef CONFIG_SUSPEND
 	for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
-		if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
+		if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) {
+			error = pm_suspend(state);
 			break;
-	}
-	if (state < PM_SUSPEND_MAX && *s) {
-		error = enter_state(state);
-		if (error) {
-			suspend_stats.fail++;
-			dpm_save_failed_errno(error);
-		} else
-			suspend_stats.success++;
+		}
 	}
 #endif
 
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 21724eee5206..98f3622d7407 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -177,13 +177,11 @@ extern const char *const pm_states[];
 
 extern bool valid_state(suspend_state_t state);
 extern int suspend_devices_and_enter(suspend_state_t state);
-extern int enter_state(suspend_state_t state);
 #else /* !CONFIG_SUSPEND */
 static inline int suspend_devices_and_enter(suspend_state_t state)
 {
 	return -ENOSYS;
 }
-static inline int enter_state(suspend_state_t state) { return -ENOSYS; }
 static inline bool valid_state(suspend_state_t state) { return false; }
 #endif /* !CONFIG_SUSPEND */
 
@@ -234,16 +232,14 @@ static inline int suspend_freeze_processes(void)
 	int error;
 
 	error = freeze_processes();
-
 	/*
 	 * freeze_processes() automatically thaws every task if freezing
 	 * fails. So we need not do anything extra upon error.
 	 */
 	if (error)
-		goto Finish;
+		return error;
 
 	error = freeze_kernel_threads();
-
 	/*
 	 * freeze_kernel_threads() thaws only kernel threads upon freezing
 	 * failure. So we have to thaw the userspace tasks ourselves.
@@ -251,7 +247,6 @@ static inline int suspend_freeze_processes(void)
 	if (error)
 		thaw_processes();
 
- Finish:
 	return error;
 }
 
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 7e426459e60a..0d2aeb226108 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -53,11 +53,9 @@ static int try_to_freeze_tasks(bool user_only)
 			 * It is "frozen enough".  If the task does wake
 			 * up, it will immediately call try_to_freeze.
 			 *
-			 * Because freeze_task() goes through p's
-			 * scheduler lock after setting TIF_FREEZE, it's
-			 * guaranteed that either we see TASK_RUNNING or
-			 * try_to_stop() after schedule() in ptrace/signal
-			 * stop sees TIF_FREEZE.
+			 * Because freeze_task() goes through p's scheduler lock, it's
+			 * guaranteed that TASK_STOPPED/TRACED -> TASK_RUNNING
+			 * transition can't race with task state testing here.
 			 */
 			if (!task_is_stopped_or_traced(p) &&
 			    !freezer_should_skip(p))
@@ -98,13 +96,15 @@ static int try_to_freeze_tasks(bool user_only)
 		       elapsed_csecs / 100, elapsed_csecs % 100,
 		       todo - wq_busy, wq_busy);
 
-		read_lock(&tasklist_lock);
-		do_each_thread(g, p) {
-			if (!wakeup && !freezer_should_skip(p) &&
-			    p != current && freezing(p) && !frozen(p))
-				sched_show_task(p);
-		} while_each_thread(g, p);
-		read_unlock(&tasklist_lock);
+		if (!wakeup) {
+			read_lock(&tasklist_lock);
+			do_each_thread(g, p) {
+				if (p != current && !freezer_should_skip(p)
+				    && freezing(p) && !frozen(p))
+					sched_show_task(p);
+			} while_each_thread(g, p);
+			read_unlock(&tasklist_lock);
+		}
 	} else {
 		printk("(elapsed %d.%02d seconds) ", elapsed_csecs / 100,
 			elapsed_csecs % 100);
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 995e3bd3417b..d6d6dbd1ecc0 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -469,21 +469,18 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
 static int __init pm_qos_power_init(void)
 {
 	int ret = 0;
+	int i;
 
-	ret = register_pm_qos_misc(&cpu_dma_pm_qos);
-	if (ret < 0) {
-		printk(KERN_ERR "pm_qos_param: cpu_dma_latency setup failed\n");
-		return ret;
-	}
-	ret = register_pm_qos_misc(&network_lat_pm_qos);
-	if (ret < 0) {
-		printk(KERN_ERR "pm_qos_param: network_latency setup failed\n");
-		return ret;
+	BUILD_BUG_ON(ARRAY_SIZE(pm_qos_array) != PM_QOS_NUM_CLASSES);
+
+	for (i = 1; i < PM_QOS_NUM_CLASSES; i++) {
+		ret = register_pm_qos_misc(pm_qos_array[i]);
+		if (ret < 0) {
+			printk(KERN_ERR "pm_qos_param: %s setup failed\n",
+			       pm_qos_array[i]->name);
+			return ret;
+		}
 	}
-	ret = register_pm_qos_misc(&network_throughput_pm_qos);
-	if (ret < 0)
-		printk(KERN_ERR
-			"pm_qos_param: network_throughput setup failed\n");
 
 	return ret;
 }
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 6a768e537001..0de28576807d 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -711,9 +711,10 @@ static void mark_nosave_pages(struct memory_bitmap *bm)
 	list_for_each_entry(region, &nosave_regions, list) {
 		unsigned long pfn;
 
-		pr_debug("PM: Marking nosave pages: %016lx - %016lx\n",
-				region->start_pfn << PAGE_SHIFT,
-				region->end_pfn << PAGE_SHIFT);
+		pr_debug("PM: Marking nosave pages: [mem %#010llx-%#010llx]\n",
+			 (unsigned long long) region->start_pfn << PAGE_SHIFT,
+			 ((unsigned long long) region->end_pfn << PAGE_SHIFT)
+				- 1);
 
 		for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++)
 			if (pfn_valid(pfn)) {
@@ -1000,20 +1001,20 @@ static void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
 	s_page = pfn_to_page(src_pfn);
 	d_page = pfn_to_page(dst_pfn);
 	if (PageHighMem(s_page)) {
-		src = kmap_atomic(s_page, KM_USER0);
-		dst = kmap_atomic(d_page, KM_USER1);
+		src = kmap_atomic(s_page);
+		dst = kmap_atomic(d_page);
 		do_copy_page(dst, src);
-		kunmap_atomic(dst, KM_USER1);
-		kunmap_atomic(src, KM_USER0);
+		kunmap_atomic(dst);
+		kunmap_atomic(src);
 	} else {
 		if (PageHighMem(d_page)) {
 			/* Page pointed to by src may contain some kernel
 			 * data modified by kmap_atomic()
 			 */
 			safe_copy_page(buffer, s_page);
-			dst = kmap_atomic(d_page, KM_USER0);
+			dst = kmap_atomic(d_page);
 			copy_page(dst, buffer);
-			kunmap_atomic(dst, KM_USER0);
+			kunmap_atomic(dst);
 		} else {
 			safe_copy_page(page_address(d_page), s_page);
 		}
@@ -1728,9 +1729,9 @@ int snapshot_read_next(struct snapshot_handle *handle)
 			 */
 			void *kaddr;
 
-			kaddr = kmap_atomic(page, KM_USER0);
+			kaddr = kmap_atomic(page);
 			copy_page(buffer, kaddr);
-			kunmap_atomic(kaddr, KM_USER0);
+			kunmap_atomic(kaddr);
 			handle->buffer = buffer;
 		} else {
 			handle->buffer = page_address(page);
@@ -2014,9 +2015,9 @@ static void copy_last_highmem_page(void)
 	if (last_highmem_page) {
 		void *dst;
 
-		dst = kmap_atomic(last_highmem_page, KM_USER0);
+		dst = kmap_atomic(last_highmem_page);
 		copy_page(dst, buffer);
-		kunmap_atomic(dst, KM_USER0);
+		kunmap_atomic(dst);
 		last_highmem_page = NULL;
 	}
 }
@@ -2309,13 +2310,13 @@ swap_two_pages_data(struct page *p1, struct page *p2, void *buf)
 {
 	void *kaddr1, *kaddr2;
 
-	kaddr1 = kmap_atomic(p1, KM_USER0);
-	kaddr2 = kmap_atomic(p2, KM_USER1);
+	kaddr1 = kmap_atomic(p1);
+	kaddr2 = kmap_atomic(p2);
 	copy_page(buf, kaddr1);
 	copy_page(kaddr1, kaddr2);
 	copy_page(kaddr2, buf);
-	kunmap_atomic(kaddr2, KM_USER1);
-	kunmap_atomic(kaddr1, KM_USER0);
+	kunmap_atomic(kaddr2);
+	kunmap_atomic(kaddr1);
 }
 
 /**
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 4fd51beed879..88e5c967370d 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -37,8 +37,8 @@ const char *const pm_states[PM_SUSPEND_MAX] = {
 static const struct platform_suspend_ops *suspend_ops;
 
 /**
- *	suspend_set_ops - Set the global suspend method table.
- *	@ops:	Pointer to ops structure.
+ * suspend_set_ops - Set the global suspend method table.
+ * @ops: Suspend operations to use.
  */
 void suspend_set_ops(const struct platform_suspend_ops *ops)
 {
@@ -58,11 +58,11 @@ bool valid_state(suspend_state_t state)
 }
 
 /**
- * suspend_valid_only_mem - generic memory-only valid callback
+ * suspend_valid_only_mem - Generic memory-only valid callback.
  *
- * Platform drivers that implement mem suspend only and only need
- * to check for that in their .valid callback can use this instead
- * of rolling their own .valid callback.
+ * Platform drivers that implement mem suspend only and only need to check for
+ * that in their .valid() callback can use this instead of rolling their own
+ * .valid() callback.
  */
 int suspend_valid_only_mem(suspend_state_t state)
 {
@@ -83,10 +83,11 @@ static int suspend_test(int level)
 }
 
 /**
- *	suspend_prepare - Do prep work before entering low-power state.
+ * suspend_prepare - Prepare for entering system sleep state.
  *
- *	This is common code that is called for each state that we're entering.
- *	Run suspend notifiers, allocate a console and stop all processes.
+ * Common code run for every system sleep state that can be entered (except for
+ * hibernation).  Run suspend notifiers, allocate the "suspend" console and
+ * freeze processes.
  */
 static int suspend_prepare(void)
 {
@@ -131,9 +132,9 @@ void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
 }
 
 /**
- * suspend_enter - enter the desired system sleep state.
- * @state: State to enter
- * @wakeup: Returns information that suspend should not be entered again.
+ * suspend_enter - Make the system enter the given sleep state.
+ * @state: System sleep state to enter.
+ * @wakeup: Returns information that the sleep state should not be re-entered.
  *
  * This function should be called after devices have been suspended.
  */
@@ -147,7 +148,7 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
 			goto Platform_finish;
 	}
 
-	error = dpm_suspend_noirq(PMSG_SUSPEND);
+	error = dpm_suspend_end(PMSG_SUSPEND);
 	if (error) {
 		printk(KERN_ERR "PM: Some devices failed to power down\n");
 		goto Platform_finish;
@@ -189,7 +190,7 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
 	if (suspend_ops->wake)
 		suspend_ops->wake();
 
-	dpm_resume_noirq(PMSG_RESUME);
+	dpm_resume_start(PMSG_RESUME);
 
  Platform_finish:
 	if (suspend_ops->finish)
@@ -199,9 +200,8 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
 }
 
 /**
- *	suspend_devices_and_enter - suspend devices and enter the desired system
- *				    sleep state.
- *	@state:		  state to enter
+ * suspend_devices_and_enter - Suspend devices and enter system sleep state.
+ * @state: System sleep state to enter.
  */
 int suspend_devices_and_enter(suspend_state_t state)
 {
@@ -251,10 +251,10 @@ int suspend_devices_and_enter(suspend_state_t state)
 }
 
 /**
- *	suspend_finish - Do final work before exiting suspend sequence.
+ * suspend_finish - Clean up before finishing the suspend sequence.
  *
- *	Call platform code to clean up, restart processes, and free the
- *	console that we've allocated. This is not called for suspend-to-disk.
+ * Call platform code to clean up, restart processes, and free the console that
+ * we've allocated. This routine is not called for hibernation.
  */
 static void suspend_finish(void)
 {
@@ -265,16 +265,14 @@ static void suspend_finish(void)
 }
 
 /**
- *	enter_state - Do common work of entering low-power state.
- *	@state:		pm_state structure for state we're entering.
+ * enter_state - Do common work needed to enter system sleep state.
+ * @state: System sleep state to enter.
  *
- *	Make sure we're the only ones trying to enter a sleep state. Fail
- *	if someone has beat us to it, since we don't want anything weird to
- *	happen when we wake up.
- *	Then, do the setup for suspend, enter the state, and cleaup (after
- *	we've woken up).
+ * Make sure that no one else is trying to put the system into a sleep state.
+ * Fail if that's not the case.  Otherwise, prepare for system suspend, make the
+ * system enter the given sleep state and clean up after wakeup.
  */
-int enter_state(suspend_state_t state)
+static int enter_state(suspend_state_t state)
 {
 	int error;
 
@@ -310,24 +308,26 @@ int enter_state(suspend_state_t state)
 }
 
 /**
- *	pm_suspend - Externally visible function for suspending system.
- *	@state:		Enumerated value of state to enter.
+ * pm_suspend - Externally visible function for suspending the system.
+ * @state: System sleep state to enter.
  *
- *	Determine whether or not value is within range, get state
- *	structure, and enter (above).
+ * Check if the value of @state represents one of the supported states,
+ * execute enter_state() and update system suspend statistics.
  */
 int pm_suspend(suspend_state_t state)
 {
-	int ret;
-	if (state > PM_SUSPEND_ON && state < PM_SUSPEND_MAX) {
-		ret = enter_state(state);
-		if (ret) {
-			suspend_stats.fail++;
-			dpm_save_failed_errno(ret);
-		} else
-			suspend_stats.success++;
-		return ret;
+	int error;
+
+	if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
+		return -EINVAL;
+
+	error = enter_state(state);
+	if (error) {
+		suspend_stats.fail++;
+		dpm_save_failed_errno(error);
+	} else {
+		suspend_stats.success++;
 	}
-	return -EINVAL;
+	return error;
 }
 EXPORT_SYMBOL(pm_suspend);
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 3e100075b13c..33c4329205af 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -249,16 +249,10 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 		}
 		pm_restore_gfp_mask();
 		error = hibernation_snapshot(data->platform_support);
-		if (error) {
-			thaw_kernel_threads();
-		} else {
+		if (!error) {
 			error = put_user(in_suspend, (int __user *)arg);
-			if (!error && !freezer_test_done)
-				data->ready = 1;
-			if (freezer_test_done) {
-				freezer_test_done = false;
-				thaw_kernel_threads();
-			}
+			data->ready = !freezer_test_done && !error;
+			freezer_test_done = false;
 		}
 		break;
 
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 00ab2ca5ed11..ee8d49b9c309 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -231,26 +231,22 @@ bool ptrace_may_access(struct task_struct *task, unsigned int mode)
 }
 
 static int ptrace_attach(struct task_struct *task, long request,
+			 unsigned long addr,
 			 unsigned long flags)
 {
 	bool seize = (request == PTRACE_SEIZE);
 	int retval;
 
-	/*
-	 * SEIZE will enable new ptrace behaviors which will be implemented
-	 * gradually.  SEIZE_DEVEL is used to prevent applications
-	 * expecting full SEIZE behaviors trapping on kernel commits which
-	 * are still in the process of implementing them.
-	 *
-	 * Only test programs for new ptrace behaviors being implemented
-	 * should set SEIZE_DEVEL.  If unset, SEIZE will fail with -EIO.
-	 *
-	 * Once SEIZE behaviors are completely implemented, this flag and
-	 * the following test will be removed.
-	 */
 	retval = -EIO;
-	if (seize && !(flags & PTRACE_SEIZE_DEVEL))
-		goto out;
+	if (seize) {
+		if (addr != 0)
+			goto out;
+		if (flags & ~(unsigned long)PTRACE_O_MASK)
+			goto out;
+		flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT);
+	} else {
+		flags = PT_PTRACED;
+	}
 
 	audit_ptrace(task);
 
@@ -262,7 +258,7 @@ static int ptrace_attach(struct task_struct *task, long request,
 
 	/*
 	 * Protect exec's credential calculations against our interference;
-	 * interference; SUID, SGID and LSM creds get determined differently
+	 * SUID, SGID and LSM creds get determined differently
 	 * under ptrace.
 	 */
 	retval = -ERESTARTNOINTR;
@@ -282,11 +278,11 @@ static int ptrace_attach(struct task_struct *task, long request,
 	if (task->ptrace)
 		goto unlock_tasklist;
 
-	task->ptrace = PT_PTRACED;
 	if (seize)
-		task->ptrace |= PT_SEIZED;
+		flags |= PT_SEIZED;
 	if (ns_capable(task_user_ns(task), CAP_SYS_PTRACE))
-		task->ptrace |= PT_PTRACE_CAP;
+		flags |= PT_PTRACE_CAP;
+	task->ptrace = flags;
 
 	__ptrace_link(task, current);
 
@@ -528,30 +524,18 @@ int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long ds
 
 static int ptrace_setoptions(struct task_struct *child, unsigned long data)
 {
-	child->ptrace &= ~PT_TRACE_MASK;
+	unsigned flags;
 
-	if (data & PTRACE_O_TRACESYSGOOD)
-		child->ptrace |= PT_TRACESYSGOOD;
-
-	if (data & PTRACE_O_TRACEFORK)
-		child->ptrace |= PT_TRACE_FORK;
-
-	if (data & PTRACE_O_TRACEVFORK)
-		child->ptrace |= PT_TRACE_VFORK;
-
-	if (data & PTRACE_O_TRACECLONE)
-		child->ptrace |= PT_TRACE_CLONE;
-
-	if (data & PTRACE_O_TRACEEXEC)
-		child->ptrace |= PT_TRACE_EXEC;
-
-	if (data & PTRACE_O_TRACEVFORKDONE)
-		child->ptrace |= PT_TRACE_VFORK_DONE;
+	if (data & ~(unsigned long)PTRACE_O_MASK)
+		return -EINVAL;
 
-	if (data & PTRACE_O_TRACEEXIT)
-		child->ptrace |= PT_TRACE_EXIT;
+	/* Avoid intermediate state when all opts are cleared */
+	flags = child->ptrace;
+	flags &= ~(PTRACE_O_MASK << PT_OPT_FLAG_SHIFT);
+	flags |= (data << PT_OPT_FLAG_SHIFT);
+	child->ptrace = flags;
 
-	return (data & ~PTRACE_O_MASK) ? -EINVAL : 0;
+	return 0;
 }
 
 static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
@@ -891,7 +875,7 @@ SYSCALL_DEFINE4(ptrace, long, request, long, pid, unsigned long, addr,
 	}
 
 	if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) {
-		ret = ptrace_attach(child, request, data);
+		ret = ptrace_attach(child, request, addr, data);
 		/*
 		 * Some architectures need to do book-keeping after
 		 * a ptrace attach.
@@ -1034,7 +1018,7 @@ asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 	}
 
 	if (request == PTRACE_ATTACH || request == PTRACE_SEIZE) {
-		ret = ptrace_attach(child, request, data);
+		ret = ptrace_attach(child, request, addr, data);
 		/*
 		 * Some architectures need to do book-keeping after
 		 * a ptrace attach.
diff --git a/kernel/resource.c b/kernel/resource.c
index 7640b3a947d0..7e8ea66a8c01 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -749,6 +749,7 @@ int adjust_resource(struct resource *res, resource_size_t start, resource_size_t
 	write_unlock(&resource_lock);
 	return result;
 }
+EXPORT_SYMBOL(adjust_resource);
 
 static void __init __reserve_region_with_split(struct resource *root,
 		resource_size_t start, resource_size_t end,
@@ -792,8 +793,6 @@ void __init reserve_region_with_split(struct resource *root,
 	write_unlock(&resource_lock);
 }
 
-EXPORT_SYMBOL(adjust_resource);
-
 /**
  * resource_alignment - calculate resource's alignment
  * @res: resource pointer
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index d2bd4647586c..503d6426126d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -71,6 +71,7 @@
 #include <linux/ftrace.h>
 #include <linux/slab.h>
 #include <linux/init_task.h>
+#include <linux/binfmts.h>
 
 #include <asm/tlb.h>
 #include <asm/irq_regs.h>
@@ -7571,8 +7572,7 @@ static inline struct task_group *cgroup_tg(struct cgroup *cgrp)
 			    struct task_group, css);
 }
 
-static struct cgroup_subsys_state *
-cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
+static struct cgroup_subsys_state *cpu_cgroup_create(struct cgroup *cgrp)
 {
 	struct task_group *tg, *parent;
 
@@ -7589,15 +7589,14 @@ cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
 	return &tg->css;
 }
 
-static void
-cpu_cgroup_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
+static void cpu_cgroup_destroy(struct cgroup *cgrp)
 {
 	struct task_group *tg = cgroup_tg(cgrp);
 
 	sched_destroy_group(tg);
 }
 
-static int cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
+static int cpu_cgroup_can_attach(struct cgroup *cgrp,
 				 struct cgroup_taskset *tset)
 {
 	struct task_struct *task;
@@ -7615,7 +7614,7 @@ static int cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
 	return 0;
 }
 
-static void cpu_cgroup_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
+static void cpu_cgroup_attach(struct cgroup *cgrp,
 			      struct cgroup_taskset *tset)
 {
 	struct task_struct *task;
@@ -7625,8 +7624,8 @@ static void cpu_cgroup_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
 }
 
 static void
-cpu_cgroup_exit(struct cgroup_subsys *ss, struct cgroup *cgrp,
-		struct cgroup *old_cgrp, struct task_struct *task)
+cpu_cgroup_exit(struct cgroup *cgrp, struct cgroup *old_cgrp,
+		struct task_struct *task)
 {
 	/*
 	 * cgroup_exit() is called in the copy_process() failure path.
@@ -7976,8 +7975,7 @@ struct cgroup_subsys cpu_cgroup_subsys = {
  */
 
 /* create a new cpu accounting group */
-static struct cgroup_subsys_state *cpuacct_create(
-	struct cgroup_subsys *ss, struct cgroup *cgrp)
+static struct cgroup_subsys_state *cpuacct_create(struct cgroup *cgrp)
 {
 	struct cpuacct *ca;
 
@@ -8007,8 +8005,7 @@ out:
 }
 
 /* destroy an existing cpu accounting group */
-static void
-cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
+static void cpuacct_destroy(struct cgroup *cgrp)
 {
 	struct cpuacct *ca = cgroup_ca(cgrp);
 
diff --git a/kernel/signal.c b/kernel/signal.c
index 8511e39813c7..d523da02dd14 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -58,21 +58,20 @@ static int sig_handler_ignored(void __user *handler, int sig)
 		(handler == SIG_DFL && sig_kernel_ignore(sig));
 }
 
-static int sig_task_ignored(struct task_struct *t, int sig,
-		int from_ancestor_ns)
+static int sig_task_ignored(struct task_struct *t, int sig, bool force)
 {
 	void __user *handler;
 
 	handler = sig_handler(t, sig);
 
 	if (unlikely(t->signal->flags & SIGNAL_UNKILLABLE) &&
-			handler == SIG_DFL && !from_ancestor_ns)
+			handler == SIG_DFL && !force)
 		return 1;
 
 	return sig_handler_ignored(handler, sig);
 }
 
-static int sig_ignored(struct task_struct *t, int sig, int from_ancestor_ns)
+static int sig_ignored(struct task_struct *t, int sig, bool force)
 {
 	/*
 	 * Blocked signals are never ignored, since the
@@ -82,7 +81,7 @@ static int sig_ignored(struct task_struct *t, int sig, int from_ancestor_ns)
 	if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig))
 		return 0;
 
-	if (!sig_task_ignored(t, sig, from_ancestor_ns))
+	if (!sig_task_ignored(t, sig, force))
 		return 0;
 
 	/*
@@ -855,7 +854,7 @@ static void ptrace_trap_notify(struct task_struct *t)
  * Returns true if the signal should be actually delivered, otherwise
  * it should be dropped.
  */
-static int prepare_signal(int sig, struct task_struct *p, int from_ancestor_ns)
+static int prepare_signal(int sig, struct task_struct *p, bool force)
 {
 	struct signal_struct *signal = p->signal;
 	struct task_struct *t;
@@ -915,7 +914,7 @@ static int prepare_signal(int sig, struct task_struct *p, int from_ancestor_ns)
 		}
 	}
 
-	return !sig_ignored(p, sig, from_ancestor_ns);
+	return !sig_ignored(p, sig, force);
 }
 
 /*
@@ -1059,7 +1058,8 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
 	assert_spin_locked(&t->sighand->siglock);
 
 	result = TRACE_SIGNAL_IGNORED;
-	if (!prepare_signal(sig, t, from_ancestor_ns))
+	if (!prepare_signal(sig, t,
+			from_ancestor_ns || (info == SEND_SIG_FORCED)))
 		goto ret;
 
 	pending = group ? &t->signal->shared_pending : &t->pending;
@@ -1601,7 +1601,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
 
 	ret = 1; /* the signal is ignored */
 	result = TRACE_SIGNAL_IGNORED;
-	if (!prepare_signal(sig, t, 0))
+	if (!prepare_signal(sig, t, false))
 		goto out;
 
 	ret = 0;
@@ -1652,6 +1652,15 @@ bool do_notify_parent(struct task_struct *tsk, int sig)
 	BUG_ON(!tsk->ptrace &&
 	       (tsk->group_leader != tsk || !thread_group_empty(tsk)));
 
+	if (sig != SIGCHLD) {
+		/*
+		 * This is only possible if parent == real_parent.
+		 * Check if it has changed security domain.
+		 */
+		if (tsk->parent_exec_id != tsk->parent->self_exec_id)
+			sig = SIGCHLD;
+	}
+
 	info.si_signo = sig;
 	info.si_errno = 0;
 	/*
diff --git a/kernel/sys.c b/kernel/sys.c
index 888d227fd195..9eb7fcab8df6 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1962,6 +1962,14 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
 		case PR_SET_MM:
 			error = prctl_set_mm(arg2, arg3, arg4, arg5);
 			break;
+		case PR_SET_CHILD_SUBREAPER:
+			me->signal->is_child_subreaper = !!arg2;
+			error = 0;
+			break;
+		case PR_GET_CHILD_SUBREAPER:
+			error = put_user(me->signal->is_child_subreaper,
+					 (int __user *) arg2);
+			break;
 		default:
 			error = -EINVAL;
 			break;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index f487f257e05e..d48ff4fd44c3 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -58,6 +58,7 @@
 #include <linux/oom.h>
 #include <linux/kmod.h>
 #include <linux/capability.h>
+#include <linux/binfmts.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -192,20 +193,6 @@ static int sysrq_sysctl_handler(ctl_table *table, int write,
 
 #endif
 
-static struct ctl_table root_table[];
-static struct ctl_table_root sysctl_table_root;
-static struct ctl_table_header root_table_header = {
-	{{.count = 1,
-	.ctl_table = root_table,
-	.ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}},
-	.root = &sysctl_table_root,
-	.set = &sysctl_table_root.default_set,
-};
-static struct ctl_table_root sysctl_table_root = {
-	.root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
-	.default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
-};
-
 static struct ctl_table kern_table[];
 static struct ctl_table vm_table[];
 static struct ctl_table fs_table[];
@@ -222,7 +209,7 @@ int sysctl_legacy_va_layout;
 
 /* The default sysctl tables: */
 
-static struct ctl_table root_table[] = {
+static struct ctl_table sysctl_base_table[] = {
 	{
 		.procname	= "kernel",
 		.mode		= 0555,
@@ -1559,490 +1546,12 @@ static struct ctl_table dev_table[] = {
 	{ }
 };
 
-static DEFINE_SPINLOCK(sysctl_lock);
-
-/* called under sysctl_lock */
-static int use_table(struct ctl_table_header *p)
-{
-	if (unlikely(p->unregistering))
-		return 0;
-	p->used++;
-	return 1;
-}
-
-/* called under sysctl_lock */
-static void unuse_table(struct ctl_table_header *p)
-{
-	if (!--p->used)
-		if (unlikely(p->unregistering))
-			complete(p->unregistering);
-}
-
-/* called under sysctl_lock, will reacquire if has to wait */
-static void start_unregistering(struct ctl_table_header *p)
-{
-	/*
-	 * if p->used is 0, nobody will ever touch that entry again;
-	 * we'll eliminate all paths to it before dropping sysctl_lock
-	 */
-	if (unlikely(p->used)) {
-		struct completion wait;
-		init_completion(&wait);
-		p->unregistering = &wait;
-		spin_unlock(&sysctl_lock);
-		wait_for_completion(&wait);
-		spin_lock(&sysctl_lock);
-	} else {
-		/* anything non-NULL; we'll never dereference it */
-		p->unregistering = ERR_PTR(-EINVAL);
-	}
-	/*
-	 * do not remove from the list until nobody holds it; walking the
-	 * list in do_sysctl() relies on that.
-	 */
-	list_del_init(&p->ctl_entry);
-}
-
-void sysctl_head_get(struct ctl_table_header *head)
-{
-	spin_lock(&sysctl_lock);
-	head->count++;
-	spin_unlock(&sysctl_lock);
-}
-
-void sysctl_head_put(struct ctl_table_header *head)
-{
-	spin_lock(&sysctl_lock);
-	if (!--head->count)
-		kfree_rcu(head, rcu);
-	spin_unlock(&sysctl_lock);
-}
-
-struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
-{
-	if (!head)
-		BUG();
-	spin_lock(&sysctl_lock);
-	if (!use_table(head))
-		head = ERR_PTR(-ENOENT);
-	spin_unlock(&sysctl_lock);
-	return head;
-}
-
-void sysctl_head_finish(struct ctl_table_header *head)
-{
-	if (!head)
-		return;
-	spin_lock(&sysctl_lock);
-	unuse_table(head);
-	spin_unlock(&sysctl_lock);
-}
-
-static struct ctl_table_set *
-lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
-{
-	struct ctl_table_set *set = &root->default_set;
-	if (root->lookup)
-		set = root->lookup(root, namespaces);
-	return set;
-}
-
-static struct list_head *
-lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
-{
-	struct ctl_table_set *set = lookup_header_set(root, namespaces);
-	return &set->list;
-}
-
-struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
-					    struct ctl_table_header *prev)
-{
-	struct ctl_table_root *root;
-	struct list_head *header_list;
-	struct ctl_table_header *head;
-	struct list_head *tmp;
-
-	spin_lock(&sysctl_lock);
-	if (prev) {
-		head = prev;
-		tmp = &prev->ctl_entry;
-		unuse_table(prev);
-		goto next;
-	}
-	tmp = &root_table_header.ctl_entry;
-	for (;;) {
-		head = list_entry(tmp, struct ctl_table_header, ctl_entry);
-
-		if (!use_table(head))
-			goto next;
-		spin_unlock(&sysctl_lock);
-		return head;
-	next:
-		root = head->root;
-		tmp = tmp->next;
-		header_list = lookup_header_list(root, namespaces);
-		if (tmp != header_list)
-			continue;
-
-		do {
-			root = list_entry(root->root_list.next,
-					struct ctl_table_root, root_list);
-			if (root == &sysctl_table_root)
-				goto out;
-			header_list = lookup_header_list(root, namespaces);
-		} while (list_empty(header_list));
-		tmp = header_list->next;
-	}
-out:
-	spin_unlock(&sysctl_lock);
-	return NULL;
-}
-
-struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
-{
-	return __sysctl_head_next(current->nsproxy, prev);
-}
-
-void register_sysctl_root(struct ctl_table_root *root)
-{
-	spin_lock(&sysctl_lock);
-	list_add_tail(&root->root_list, &sysctl_table_root.root_list);
-	spin_unlock(&sysctl_lock);
-}
-
-/*
- * sysctl_perm does NOT grant the superuser all rights automatically, because
- * some sysctl variables are readonly even to root.
- */
-
-static int test_perm(int mode, int op)
-{
-	if (!current_euid())
-		mode >>= 6;
-	else if (in_egroup_p(0))
-		mode >>= 3;
-	if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
-		return 0;
-	return -EACCES;
-}
-
-int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
-{
-	int mode;
-
-	if (root->permissions)
-		mode = root->permissions(root, current->nsproxy, table);
-	else
-		mode = table->mode;
-
-	return test_perm(mode, op);
-}
-
-static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
-{
-	for (; table->procname; table++) {
-		table->parent = parent;
-		if (table->child)
-			sysctl_set_parent(table, table->child);
-	}
-}
-
-static __init int sysctl_init(void)
+int __init sysctl_init(void)
 {
-	sysctl_set_parent(NULL, root_table);
-#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
-	sysctl_check_table(current->nsproxy, root_table);
-#endif
+	register_sysctl_table(sysctl_base_table);
 	return 0;
 }
 
-core_initcall(sysctl_init);
-
-static struct ctl_table *is_branch_in(struct ctl_table *branch,
-				      struct ctl_table *table)
-{
-	struct ctl_table *p;
-	const char *s = branch->procname;
-
-	/* branch should have named subdirectory as its first element */
-	if (!s || !branch->child)
-		return NULL;
-
-	/* ... and nothing else */
-	if (branch[1].procname)
-		return NULL;
-
-	/* table should contain subdirectory with the same name */
-	for (p = table; p->procname; p++) {
-		if (!p->child)
-			continue;
-		if (p->procname && strcmp(p->procname, s) == 0)
-			return p;
-	}
-	return NULL;
-}
-
-/* see if attaching q to p would be an improvement */
-static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
-{
-	struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
-	struct ctl_table *next;
-	int is_better = 0;
-	int not_in_parent = !p->attached_by;
-
-	while ((next = is_branch_in(by, to)) != NULL) {
-		if (by == q->attached_by)
-			is_better = 1;
-		if (to == p->attached_by)
-			not_in_parent = 1;
-		by = by->child;
-		to = next->child;
-	}
-
-	if (is_better && not_in_parent) {
-		q->attached_by = by;
-		q->attached_to = to;
-		q->parent = p;
-	}
-}
-
-/**
- * __register_sysctl_paths - register a sysctl hierarchy
- * @root: List of sysctl headers to register on
- * @namespaces: Data to compute which lists of sysctl entries are visible
- * @path: The path to the directory the sysctl table is in.
- * @table: the top-level table structure
- *
- * Register a sysctl table hierarchy. @table should be a filled in ctl_table
- * array. A completely 0 filled entry terminates the table.
- *
- * The members of the &struct ctl_table structure are used as follows:
- *
- * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
- *            enter a sysctl file
- *
- * data - a pointer to data for use by proc_handler
- *
- * maxlen - the maximum size in bytes of the data
- *
- * mode - the file permissions for the /proc/sys file, and for sysctl(2)
- *
- * child - a pointer to the child sysctl table if this entry is a directory, or
- *         %NULL.
- *
- * proc_handler - the text handler routine (described below)
- *
- * de - for internal use by the sysctl routines
- *
- * extra1, extra2 - extra pointers usable by the proc handler routines
- *
- * Leaf nodes in the sysctl tree will be represented by a single file
- * under /proc; non-leaf nodes will be represented by directories.
- *
- * sysctl(2) can automatically manage read and write requests through
- * the sysctl table.  The data and maxlen fields of the ctl_table
- * struct enable minimal validation of the values being written to be
- * performed, and the mode field allows minimal authentication.
- *
- * There must be a proc_handler routine for any terminal nodes
- * mirrored under /proc/sys (non-terminals are handled by a built-in
- * directory handler).  Several default handlers are available to
- * cover common cases -
- *
- * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
- * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
- * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
- *
- * It is the handler's job to read the input buffer from user memory
- * and process it. The handler should return 0 on success.
- *
- * This routine returns %NULL on a failure to register, and a pointer
- * to the table header on success.
- */
-struct ctl_table_header *__register_sysctl_paths(
-	struct ctl_table_root *root,
-	struct nsproxy *namespaces,
-	const struct ctl_path *path, struct ctl_table *table)
-{
-	struct ctl_table_header *header;
-	struct ctl_table *new, **prevp;
-	unsigned int n, npath;
-	struct ctl_table_set *set;
-
-	/* Count the path components */
-	for (npath = 0; path[npath].procname; ++npath)
-		;
-
-	/*
-	 * For each path component, allocate a 2-element ctl_table array.
-	 * The first array element will be filled with the sysctl entry
-	 * for this, the second will be the sentinel (procname == 0).
-	 *
-	 * We allocate everything in one go so that we don't have to
-	 * worry about freeing additional memory in unregister_sysctl_table.
-	 */
-	header = kzalloc(sizeof(struct ctl_table_header) +
-			 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
-	if (!header)
-		return NULL;
-
-	new = (struct ctl_table *) (header + 1);
-
-	/* Now connect the dots */
-	prevp = &header->ctl_table;
-	for (n = 0; n < npath; ++n, ++path) {
-		/* Copy the procname */
-		new->procname = path->procname;
-		new->mode     = 0555;
-
-		*prevp = new;
-		prevp = &new->child;
-
-		new += 2;
-	}
-	*prevp = table;
-	header->ctl_table_arg = table;
-
-	INIT_LIST_HEAD(&header->ctl_entry);
-	header->used = 0;
-	header->unregistering = NULL;
-	header->root = root;
-	sysctl_set_parent(NULL, header->ctl_table);
-	header->count = 1;
-#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
-	if (sysctl_check_table(namespaces, header->ctl_table)) {
-		kfree(header);
-		return NULL;
-	}
-#endif
-	spin_lock(&sysctl_lock);
-	header->set = lookup_header_set(root, namespaces);
-	header->attached_by = header->ctl_table;
-	header->attached_to = root_table;
-	header->parent = &root_table_header;
-	for (set = header->set; set; set = set->parent) {
-		struct ctl_table_header *p;
-		list_for_each_entry(p, &set->list, ctl_entry) {
-			if (p->unregistering)
-				continue;
-			try_attach(p, header);
-		}
-	}
-	header->parent->count++;
-	list_add_tail(&header->ctl_entry, &header->set->list);
-	spin_unlock(&sysctl_lock);
-
-	return header;
-}
-
-/**
- * register_sysctl_table_path - register a sysctl table hierarchy
- * @path: The path to the directory the sysctl table is in.
- * @table: the top-level table structure
- *
- * Register a sysctl table hierarchy. @table should be a filled in ctl_table
- * array. A completely 0 filled entry terminates the table.
- *
- * See __register_sysctl_paths for more details.
- */
-struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
-						struct ctl_table *table)
-{
-	return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
-					path, table);
-}
-
-/**
- * register_sysctl_table - register a sysctl table hierarchy
- * @table: the top-level table structure
- *
- * Register a sysctl table hierarchy. @table should be a filled in ctl_table
- * array. A completely 0 filled entry terminates the table.
- *
- * See register_sysctl_paths for more details.
- */
-struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
-{
-	static const struct ctl_path null_path[] = { {} };
-
-	return register_sysctl_paths(null_path, table);
-}
-
-/**
- * unregister_sysctl_table - unregister a sysctl table hierarchy
- * @header: the header returned from register_sysctl_table
- *
- * Unregisters the sysctl table and all children. proc entries may not
- * actually be removed until they are no longer used by anyone.
- */
-void unregister_sysctl_table(struct ctl_table_header * header)
-{
-	might_sleep();
-
-	if (header == NULL)
-		return;
-
-	spin_lock(&sysctl_lock);
-	start_unregistering(header);
-	if (!--header->parent->count) {
-		WARN_ON(1);
-		kfree_rcu(header->parent, rcu);
-	}
-	if (!--header->count)
-		kfree_rcu(header, rcu);
-	spin_unlock(&sysctl_lock);
-}
-
-int sysctl_is_seen(struct ctl_table_header *p)
-{
-	struct ctl_table_set *set = p->set;
-	int res;
-	spin_lock(&sysctl_lock);
-	if (p->unregistering)
-		res = 0;
-	else if (!set->is_seen)
-		res = 1;
-	else
-		res = set->is_seen(set);
-	spin_unlock(&sysctl_lock);
-	return res;
-}
-
-void setup_sysctl_set(struct ctl_table_set *p,
-	struct ctl_table_set *parent,
-	int (*is_seen)(struct ctl_table_set *))
-{
-	INIT_LIST_HEAD(&p->list);
-	p->parent = parent ? parent : &sysctl_table_root.default_set;
-	p->is_seen = is_seen;
-}
-
-#else /* !CONFIG_SYSCTL */
-struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
-{
-	return NULL;
-}
-
-struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
-						    struct ctl_table *table)
-{
-	return NULL;
-}
-
-void unregister_sysctl_table(struct ctl_table_header * table)
-{
-}
-
-void setup_sysctl_set(struct ctl_table_set *p,
-	struct ctl_table_set *parent,
-	int (*is_seen)(struct ctl_table_set *))
-{
-}
-
-void sysctl_head_put(struct ctl_table_header *head)
-{
-}
-
 #endif /* CONFIG_SYSCTL */
 
 /*
@@ -3008,6 +2517,3 @@ EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
 EXPORT_SYMBOL(proc_dostring);
 EXPORT_SYMBOL(proc_doulongvec_minmax);
 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
-EXPORT_SYMBOL(register_sysctl_table);
-EXPORT_SYMBOL(register_sysctl_paths);
-EXPORT_SYMBOL(unregister_sysctl_table);
diff --git a/kernel/sysctl_check.c b/kernel/sysctl_check.c
deleted file mode 100644
index 362da653813d..000000000000
--- a/kernel/sysctl_check.c
+++ /dev/null
@@ -1,160 +0,0 @@
-#include <linux/stat.h>
-#include <linux/sysctl.h>
-#include "../fs/xfs/xfs_sysctl.h"
-#include <linux/sunrpc/debug.h>
-#include <linux/string.h>
-#include <net/ip_vs.h>
-
-
-static int sysctl_depth(struct ctl_table *table)
-{
-	struct ctl_table *tmp;
-	int depth;
-
-	depth = 0;
-	for (tmp = table; tmp->parent; tmp = tmp->parent)
-		depth++;
-
-	return depth;
-}
-
-static struct ctl_table *sysctl_parent(struct ctl_table *table, int n)
-{
-	int i;
-
-	for (i = 0; table && i < n; i++)
-		table = table->parent;
-
-	return table;
-}
-
-
-static void sysctl_print_path(struct ctl_table *table)
-{
-	struct ctl_table *tmp;
-	int depth, i;
-	depth = sysctl_depth(table);
-	if (table->procname) {
-		for (i = depth; i >= 0; i--) {
-			tmp = sysctl_parent(table, i);
-			printk("/%s", tmp->procname?tmp->procname:"");
-		}
-	}
-	printk(" ");
-}
-
-static struct ctl_table *sysctl_check_lookup(struct nsproxy *namespaces,
-						struct ctl_table *table)
-{
-	struct ctl_table_header *head;
-	struct ctl_table *ref, *test;
-	int depth, cur_depth;
-
-	depth = sysctl_depth(table);
-
-	for (head = __sysctl_head_next(namespaces, NULL); head;
-	     head = __sysctl_head_next(namespaces, head)) {
-		cur_depth = depth;
-		ref = head->ctl_table;
-repeat:
-		test = sysctl_parent(table, cur_depth);
-		for (; ref->procname; ref++) {
-			int match = 0;
-			if (cur_depth && !ref->child)
-				continue;
-
-			if (test->procname && ref->procname &&
-			    (strcmp(test->procname, ref->procname) == 0))
-					match++;
-
-			if (match) {
-				if (cur_depth != 0) {
-					cur_depth--;
-					ref = ref->child;
-					goto repeat;
-				}
-				goto out;
-			}
-		}
-	}
-	ref = NULL;
-out:
-	sysctl_head_finish(head);
-	return ref;
-}
-
-static void set_fail(const char **fail, struct ctl_table *table, const char *str)
-{
-	if (*fail) {
-		printk(KERN_ERR "sysctl table check failed: ");
-		sysctl_print_path(table);
-		printk(" %s\n", *fail);
-		dump_stack();
-	}
-	*fail = str;
-}
-
-static void sysctl_check_leaf(struct nsproxy *namespaces,
-				struct ctl_table *table, const char **fail)
-{
-	struct ctl_table *ref;
-
-	ref = sysctl_check_lookup(namespaces, table);
-	if (ref && (ref != table))
-		set_fail(fail, table, "Sysctl already exists");
-}
-
-int sysctl_check_table(struct nsproxy *namespaces, struct ctl_table *table)
-{
-	int error = 0;
-	for (; table->procname; table++) {
-		const char *fail = NULL;
-
-		if (table->parent) {
-			if (!table->parent->procname)
-				set_fail(&fail, table, "Parent without procname");
-		}
-		if (table->child) {
-			if (table->data)
-				set_fail(&fail, table, "Directory with data?");
-			if (table->maxlen)
-				set_fail(&fail, table, "Directory with maxlen?");
-			if ((table->mode & (S_IRUGO|S_IXUGO)) != table->mode)
-				set_fail(&fail, table, "Writable sysctl directory");
-			if (table->proc_handler)
-				set_fail(&fail, table, "Directory with proc_handler");
-			if (table->extra1)
-				set_fail(&fail, table, "Directory with extra1");
-			if (table->extra2)
-				set_fail(&fail, table, "Directory with extra2");
-		} else {
-			if ((table->proc_handler == proc_dostring) ||
-			    (table->proc_handler == proc_dointvec) ||
-			    (table->proc_handler == proc_dointvec_minmax) ||
-			    (table->proc_handler == proc_dointvec_jiffies) ||
-			    (table->proc_handler == proc_dointvec_userhz_jiffies) ||
-			    (table->proc_handler == proc_dointvec_ms_jiffies) ||
-			    (table->proc_handler == proc_doulongvec_minmax) ||
-			    (table->proc_handler == proc_doulongvec_ms_jiffies_minmax)) {
-				if (!table->data)
-					set_fail(&fail, table, "No data");
-				if (!table->maxlen)
-					set_fail(&fail, table, "No maxlen");
-			}
-#ifdef CONFIG_PROC_SYSCTL
-			if (!table->proc_handler)
-				set_fail(&fail, table, "No proc_handler");
-#endif
-			sysctl_check_leaf(namespaces, table, &fail);
-		}
-		if (table->mode > 0777)
-			set_fail(&fail, table, "bogus .mode");
-		if (fail) {
-			set_fail(&fail, table, NULL);
-			error = -EINVAL;
-		}
-		if (table->child)
-			error |= sysctl_check_table(namespaces, table->child);
-	}
-	return error;
-}
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 403c2a092830..15be32e19c6e 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1260,6 +1260,8 @@ ktime_t ktime_get_monotonic_offset(void)
 
 	return timespec_to_ktime(wtom);
 }
+EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset);
+
 
 /**
  * xtime_update() - advances the timekeeping infrastructure
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index c5a01873567d..859fae6b1825 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -264,7 +264,7 @@ void *trace_seq_reserve(struct trace_seq *s, size_t len)
 	return ret;
 }
 
-int trace_seq_path(struct trace_seq *s, struct path *path)
+int trace_seq_path(struct trace_seq *s, const struct path *path)
 {
 	unsigned char *p;
 
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 14bc092fb12c..df30ee08bdd4 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -9,6 +9,8 @@
  * to those contributors as well.
  */
 
+#define pr_fmt(fmt) "NMI watchdog: " fmt
+
 #include <linux/mm.h>
 #include <linux/cpu.h>
 #include <linux/nmi.h>
@@ -319,11 +321,9 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
  */
 static int watchdog(void *unused)
 {
-	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
+	struct sched_param param = { .sched_priority = 0 };
 	struct hrtimer *hrtimer = &__raw_get_cpu_var(watchdog_hrtimer);
 
-	sched_setscheduler(current, SCHED_FIFO, &param);
-
 	/* initialize timestamp */
 	__touch_watchdog();
 
@@ -349,8 +349,11 @@ static int watchdog(void *unused)
 
 		set_current_state(TASK_INTERRUPTIBLE);
 	}
+	/*
+	 * Drop the policy/priority elevation during thread exit to avoid a
+	 * scheduling latency spike.
+	 */
 	__set_current_state(TASK_RUNNING);
-	param.sched_priority = 0;
 	sched_setscheduler(current, SCHED_NORMAL, &param);
 	return 0;
 }
@@ -376,18 +379,20 @@ static int watchdog_nmi_enable(int cpu)
 	/* Try to register using hardware perf events */
 	event = perf_event_create_kernel_counter(wd_attr, cpu, NULL, watchdog_overflow_callback, NULL);
 	if (!IS_ERR(event)) {
-		printk(KERN_INFO "NMI watchdog enabled, takes one hw-pmu counter.\n");
+		pr_info("enabled, takes one hw-pmu counter.\n");
 		goto out_save;
 	}
 
 
 	/* vary the KERN level based on the returned errno */
 	if (PTR_ERR(event) == -EOPNOTSUPP)
-		printk(KERN_INFO "NMI watchdog disabled (cpu%i): not supported (no LAPIC?)\n", cpu);
+		pr_info("disabled (cpu%i): not supported (no LAPIC?)\n", cpu);
 	else if (PTR_ERR(event) == -ENOENT)
-		printk(KERN_WARNING "NMI watchdog disabled (cpu%i): hardware events not enabled\n", cpu);
+		pr_warning("disabled (cpu%i): hardware events not enabled\n",
+			 cpu);
 	else
-		printk(KERN_ERR "NMI watchdog disabled (cpu%i): unable to create perf event: %ld\n", cpu, PTR_ERR(event));
+		pr_err("disabled (cpu%i): unable to create perf event: %ld\n",
+			cpu, PTR_ERR(event));
 	return PTR_ERR(event);
 
 	/* success path */
@@ -439,9 +444,10 @@ static int watchdog_enable(int cpu)
 
 	/* create the watchdog thread */
 	if (!p) {
+		struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
 		p = kthread_create_on_node(watchdog, NULL, cpu_to_node(cpu), "watchdog/%d", cpu);
 		if (IS_ERR(p)) {
-			printk(KERN_ERR "softlockup watchdog for %i failed\n", cpu);
+			pr_err("softlockup watchdog for %i failed\n", cpu);
 			if (!err) {
 				/* if hardlockup hasn't already set this */
 				err = PTR_ERR(p);
@@ -450,6 +456,7 @@ static int watchdog_enable(int cpu)
 			}
 			goto out;
 		}
+		sched_setscheduler(p, SCHED_FIFO, &param);
 		kthread_bind(p, cpu);
 		per_cpu(watchdog_touch_ts, cpu) = 0;
 		per_cpu(softlockup_watchdog, cpu) = p;
@@ -496,7 +503,7 @@ static void watchdog_enable_all_cpus(void)
 			watchdog_enabled = 1;
 
 	if (!watchdog_enabled)
-		printk(KERN_ERR "watchdog: failed to be enabled on some cpus\n");
+		pr_err("failed to be enabled on some cpus\n");
 
 }
 
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index f2c5638bb5ab..5abf42f63c08 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -476,13 +476,8 @@ static struct cpu_workqueue_struct *get_cwq(unsigned int cpu,
 					    struct workqueue_struct *wq)
 {
 	if (!(wq->flags & WQ_UNBOUND)) {
-		if (likely(cpu < nr_cpu_ids)) {
-#ifdef CONFIG_SMP
+		if (likely(cpu < nr_cpu_ids))
 			return per_cpu_ptr(wq->cpu_wq.pcpu, cpu);
-#else
-			return wq->cpu_wq.single;
-#endif
-		}
 	} else if (likely(cpu == WORK_CPU_UNBOUND))
 		return wq->cpu_wq.single;
 	return NULL;
@@ -2899,13 +2894,8 @@ static int alloc_cwqs(struct workqueue_struct *wq)
 	const size_t size = sizeof(struct cpu_workqueue_struct);
 	const size_t align = max_t(size_t, 1 << WORK_STRUCT_FLAG_BITS,
 				   __alignof__(unsigned long long));
-#ifdef CONFIG_SMP
-	bool percpu = !(wq->flags & WQ_UNBOUND);
-#else
-	bool percpu = false;
-#endif
 
-	if (percpu)
+	if (!(wq->flags & WQ_UNBOUND))
 		wq->cpu_wq.pcpu = __alloc_percpu(size, align);
 	else {
 		void *ptr;
@@ -2929,13 +2919,7 @@ static int alloc_cwqs(struct workqueue_struct *wq)
 
 static void free_cwqs(struct workqueue_struct *wq)
 {
-#ifdef CONFIG_SMP
-	bool percpu = !(wq->flags & WQ_UNBOUND);
-#else
-	bool percpu = false;
-#endif
-
-	if (percpu)
+	if (!(wq->flags & WQ_UNBOUND))
 		free_percpu(wq->cpu_wq.pcpu);
 	else if (wq->cpu_wq.single) {
 		/* the pointer to free is stored right after the cwq */