Merge branch 'linus' into cpus4096

Conflicts:
	kernel/trace/ring_buffer.c

11 files changed, 76 insertions, 35 deletions

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 5a732c5ef08b..8ea32e8d68b0 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -462,7 +462,7 @@ out:
  * It must be called by the arch code on the new cpu, before the new cpu
  * enables interrupts and before the "boot" cpu returns from __cpu_up().
  */
-void notify_cpu_starting(unsigned int cpu)
+void __cpuinit notify_cpu_starting(unsigned int cpu)
 {
 	unsigned long val = CPU_STARTING;
 
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index da7ff6137f37..96c0ba13b8cd 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -585,7 +585,7 @@ static int generate_sched_domains(cpumask_t **domains,
 	int i, j, k;		/* indices for partition finding loops */
 	cpumask_t *doms;	/* resulting partition; i.e. sched domains */
 	struct sched_domain_attr *dattr;  /* attributes for custom domains */
-	int ndoms;		/* number of sched domains in result */
+	int ndoms = 0;		/* number of sched domains in result */
 	int nslot;		/* next empty doms[] cpumask_t slot */
 
 	doms = NULL;
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index c9767e641980..64c1c7253dae 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -25,6 +25,8 @@ static inline void unregister_handler_proc(unsigned int irq,
 					   struct irqaction *action) { }
 #endif
 
+extern int irq_select_affinity_usr(unsigned int irq);
+
 /*
  * Debugging printout:
  */
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index c498a1b8c621..801addda3c43 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -82,24 +82,27 @@ int irq_can_set_affinity(unsigned int irq)
 int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
 {
 	struct irq_desc *desc = irq_to_desc(irq);
+	unsigned long flags;
 
 	if (!desc->chip->set_affinity)
 		return -EINVAL;
 
+	spin_lock_irqsave(&desc->lock, flags);
+
 #ifdef CONFIG_GENERIC_PENDING_IRQ
 	if (desc->status & IRQ_MOVE_PCNTXT || desc->status & IRQ_DISABLED) {
-		unsigned long flags;
-
-		spin_lock_irqsave(&desc->lock, flags);
 		desc->affinity = cpumask;
 		desc->chip->set_affinity(irq, cpumask);
-		spin_unlock_irqrestore(&desc->lock, flags);
-	} else
-		set_pending_irq(irq, cpumask);
+	} else {
+		desc->status |= IRQ_MOVE_PENDING;
+		desc->pending_mask = cpumask;
+	}
 #else
 	desc->affinity = cpumask;
 	desc->chip->set_affinity(irq, cpumask);
 #endif
+	desc->status |= IRQ_AFFINITY_SET;
+	spin_unlock_irqrestore(&desc->lock, flags);
 	return 0;
 }
 
@@ -107,24 +110,59 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
 /*
  * Generic version of the affinity autoselector.
  */
-int irq_select_affinity(unsigned int irq)
+int do_irq_select_affinity(unsigned int irq, struct irq_desc *desc)
 {
 	cpumask_t mask;
-	struct irq_desc *desc;
 
 	if (!irq_can_set_affinity(irq))
 		return 0;
 
 	cpus_and(mask, cpu_online_map, irq_default_affinity);
 
-	desc = irq_to_desc(irq);
+	/*
+	 * Preserve an userspace affinity setup, but make sure that
+	 * one of the targets is online.
+	 */
+	if (desc->status & (IRQ_AFFINITY_SET | IRQ_NO_BALANCING)) {
+		if (cpus_intersects(desc->affinity, cpu_online_map))
+			mask = desc->affinity;
+		else
+			desc->status &= ~IRQ_AFFINITY_SET;
+	}
+
 	desc->affinity = mask;
 	desc->chip->set_affinity(irq, mask);
 
 	return 0;
 }
+#else
+static inline int do_irq_select_affinity(unsigned int irq, struct irq_desc *d)
+{
+	return irq_select_affinity(irq);
+}
 #endif
 
+/*
+ * Called when affinity is set via /proc/irq
+ */
+int irq_select_affinity_usr(unsigned int irq)
+{
+	struct irq_desc *desc = irq_to_desc(irq);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&desc->lock, flags);
+	ret = do_irq_select_affinity(irq, desc);
+	spin_unlock_irqrestore(&desc->lock, flags);
+
+	return ret;
+}
+
+#else
+static inline int do_irq_select_affinity(int irq, struct irq_desc *desc)
+{
+	return 0;
+}
 #endif
 
 /**
@@ -327,7 +365,7 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
 		 * IRQF_TRIGGER_* but the PIC does not support multiple
 		 * flow-types?
 		 */
-		pr_warning("No set_type function for IRQ %d (%s)\n", irq,
+		pr_debug("No set_type function for IRQ %d (%s)\n", irq,
 				chip ? (chip->name ? : "unknown") : "unknown");
 		return 0;
 	}
@@ -445,8 +483,12 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
 			/* Undo nested disables: */
 			desc->depth = 1;
 
+		/* Exclude IRQ from balancing if requested */
+		if (new->flags & IRQF_NOBALANCING)
+			desc->status |= IRQ_NO_BALANCING;
+
 		/* Set default affinity mask once everything is setup */
-		irq_select_affinity(irq);
+		do_irq_select_affinity(irq, desc);
 
 	} else if ((new->flags & IRQF_TRIGGER_MASK)
 			&& (new->flags & IRQF_TRIGGER_MASK)
@@ -459,10 +501,6 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
 
 	*p = new;
 
-	/* Exclude IRQ from balancing */
-	if (new->flags & IRQF_NOBALANCING)
-		desc->status |= IRQ_NO_BALANCING;
-
 	/* Reset broken irq detection when installing new handler */
 	desc->irq_count = 0;
 	desc->irqs_unhandled = 0;
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 90b920d3f52b..9db681d95814 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -1,17 +1,6 @@
 
 #include <linux/irq.h>
 
-void set_pending_irq(unsigned int irq, cpumask_t mask)
-{
-	struct irq_desc *desc = irq_to_desc(irq);
-	unsigned long flags;
-
-	spin_lock_irqsave(&desc->lock, flags);
-	desc->status |= IRQ_MOVE_PENDING;
-	desc->pending_mask = mask;
-	spin_unlock_irqrestore(&desc->lock, flags);
-}
-
 void move_masked_irq(int irq)
 {
 	struct irq_desc *desc = irq_to_desc(irq);
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 4d161c70ba55..d257e7d6a8a4 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -62,7 +62,7 @@ static ssize_t irq_affinity_proc_write(struct file *file,
 	if (!cpus_intersects(new_value, cpu_online_map))
 		/* Special case for empty set - allow the architecture
 		   code to set default SMP affinity. */
-		return irq_select_affinity(irq) ? -EINVAL : count;
+		return irq_select_affinity_usr(irq) ? -EINVAL : count;
 
 	irq_set_affinity(irq, new_value);
 
diff --git a/kernel/panic.c b/kernel/panic.c
index 6513aac8e992..4d5088355bfe 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -167,6 +167,7 @@ static const struct tnt tnts[] = {
  *  'M' - System experienced a machine check exception.
  *  'B' - System has hit bad_page.
  *  'U' - Userspace-defined naughtiness.
+ *  'D' - Kernel has oopsed before
  *  'A' - ACPI table overridden.
  *  'W' - Taint on warning.
  *  'C' - modules from drivers/staging are loaded.
diff --git a/kernel/profile.c b/kernel/profile.c
index 7f93a5042d3b..60adefb59b5e 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -351,7 +351,7 @@ out:
 	put_cpu();
 }
 
-static int __devinit profile_cpu_callback(struct notifier_block *info,
+static int __cpuinit profile_cpu_callback(struct notifier_block *info,
 					unsigned long action, void *__cpu)
 {
 	int node, cpu = (unsigned long)__cpu;
@@ -596,7 +596,7 @@ out_cleanup:
 #define create_hash_tables()			({ 0; })
 #endif
 
-int create_proc_profile(void)
+int __ref create_proc_profile(void) /* false positive from hotcpu_notifier */
 {
 	struct proc_dir_entry *entry;
 
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 1e68e4c39e2c..4c8bcd7dd8e0 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -612,7 +612,7 @@ int generic_ptrace_pokedata(struct task_struct *tsk, long addr, long data)
 	return (copied == sizeof(data)) ? 0 : -EIO;
 }
 
-#if defined CONFIG_COMPAT && defined __ARCH_WANT_COMPAT_SYS_PTRACE
+#if defined CONFIG_COMPAT
 #include <linux/compat.h>
 
 int compat_ptrace_request(struct task_struct *child, compat_long_t request,
@@ -709,4 +709,4 @@ asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 	unlock_kernel();
 	return ret;
 }
-#endif	/* CONFIG_COMPAT && __ARCH_WANT_COMPAT_SYS_PTRACE */
+#endif	/* CONFIG_COMPAT */
diff --git a/kernel/sched.c b/kernel/sched.c
index 3f5bfdc3d94d..8050a61a7adb 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1439,9 +1439,10 @@ static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
 static unsigned long cpu_avg_load_per_task(int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
+	unsigned long nr_running = ACCESS_ONCE(rq->nr_running);
 
-	if (rq->nr_running)
-		rq->avg_load_per_task = rq->load.weight / rq->nr_running;
+	if (nr_running)
+		rq->avg_load_per_task = rq->load.weight / nr_running;
 	else
 		rq->avg_load_per_task = 0;
 
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 65d4a9ba79e4..c83f566e940a 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -176,6 +176,9 @@ extern struct ctl_table random_table[];
 #ifdef CONFIG_INOTIFY_USER
 extern struct ctl_table inotify_table[];
 #endif
+#ifdef CONFIG_EPOLL
+extern struct ctl_table epoll_table[];
+#endif
 
 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 int sysctl_legacy_va_layout;
@@ -1335,6 +1338,13 @@ static struct ctl_table fs_table[] = {
 		.child		= inotify_table,
 	},
 #endif	
+#ifdef CONFIG_EPOLL
+	{
+		.procname	= "epoll",
+		.mode		= 0555,
+		.child		= epoll_table,
+	},
+#endif
 #endif
 	{
 		.ctl_name	= KERN_SETUID_DUMPABLE,