Merge branch 'akpm' (patches from Andrew)

Merge even more updates from Andrew Morton:

 - a kernel-wide sweep of show_stack()

 - pagetable cleanups

 - abstract out accesses to mmap_sem - prep for mmap_sem scalability work

 - hch's user acess work

Subsystems affected by this patch series: debug, mm/pagemap, mm/maccess,
mm/documentation.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (93 commits)
  include/linux/cache.h: expand documentation over __read_mostly
  maccess: return -ERANGE when probe_kernel_read() fails
  x86: use non-set_fs based maccess routines
  maccess: allow architectures to provide kernel probing directly
  maccess: move user access routines together
  maccess: always use strict semantics for probe_kernel_read
  maccess: remove strncpy_from_unsafe
  tracing/kprobes: handle mixed kernel/userspace probes better
  bpf: rework the compat kernel probe handling
  bpf:bpf_seq_printf(): handle potentially unsafe format string better
  bpf: handle the compat string in bpf_trace_copy_string better
  bpf: factor out a bpf_trace_copy_string helper
  maccess: unify the probe kernel arch hooks
  maccess: remove probe_read_common and probe_write_common
  maccess: rename strnlen_unsafe_user to strnlen_user_nofault
  maccess: rename strncpy_from_unsafe_strict to strncpy_from_kernel_nofault
  maccess: rename strncpy_from_unsafe_user to strncpy_from_user_nofault
  maccess: update the top of file comment
  maccess: clarify kerneldoc comments
  maccess: remove duplicate kerneldoc comments
  ...

1 files changed, 7 insertions, 6 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9d6042178ca7..dc7b87310c10 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -15,6 +15,7 @@
 #include <linux/atomic.h>
 #include <linux/debug_locks.h>
 #include <linux/mm_types.h>
+#include <linux/mmap_lock.h>
 #include <linux/range.h>
 #include <linux/pfn.h>
 #include <linux/percpu-refcount.h>
@@ -28,6 +29,7 @@
 #include <linux/overflow.h>
 #include <linux/sizes.h>
 #include <linux/sched.h>
+#include <linux/pgtable.h>
 
 struct mempolicy;
 struct anon_vma;
@@ -92,7 +94,6 @@ extern int mmap_rnd_compat_bits __read_mostly;
 #endif
 
 #include <asm/page.h>
-#include <asm/pgtable.h>
 #include <asm/processor.h>
 
 /*
@@ -401,7 +402,7 @@ extern pgprot_t protection_map[16];
  * @FAULT_FLAG_WRITE: Fault was a write fault.
  * @FAULT_FLAG_MKWRITE: Fault was mkwrite of existing PTE.
  * @FAULT_FLAG_ALLOW_RETRY: Allow to retry the fault if blocked.
- * @FAULT_FLAG_RETRY_NOWAIT: Don't drop mmap_sem and wait when retrying.
+ * @FAULT_FLAG_RETRY_NOWAIT: Don't drop mmap_lock and wait when retrying.
  * @FAULT_FLAG_KILLABLE: The fault task is in SIGKILL killable region.
  * @FAULT_FLAG_TRIED: The fault has been tried once.
  * @FAULT_FLAG_USER: The fault originated in userspace.
@@ -451,10 +452,10 @@ extern pgprot_t protection_map[16];
  * fault_flag_allow_retry_first - check ALLOW_RETRY the first time
  *
  * This is mostly used for places where we want to try to avoid taking
- * the mmap_sem for too long a time when waiting for another condition
+ * the mmap_lock for too long a time when waiting for another condition
  * to change, in which case we can try to be polite to release the
- * mmap_sem in the first round to avoid potential starvation of other
- * processes that would also want the mmap_sem.
+ * mmap_lock in the first round to avoid potential starvation of other
+ * processes that would also want the mmap_lock.
  *
  * Return: true if the page fault allows retry and this is the first
  * attempt of the fault handling; false otherwise.
@@ -581,7 +582,7 @@ struct vm_operations_struct {
 	 * (vma,addr) marked as MPOL_SHARED.  The shared policy infrastructure
 	 * in mm/mempolicy.c will do this automatically.
 	 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
-	 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
+	 * marked as MPOL_SHARED. vma policies are protected by the mmap_lock.
 	 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
 	 * must return NULL--i.e., do not "fallback" to task or system default
 	 * policy.