Merge branch 'next' (accumulated 3.16 merge window patches) into master

Now that 3.15 is released, this merges the 'next' branch into 'master',
bringing us to the normal situation where my 'master' branch is the
merge window.

* accumulated work in next: (6809 commits)
  ufs: sb mutex merge + mutex_destroy
  powerpc: update comments for generic idle conversion
  cris: update comments for generic idle conversion
  idle: remove cpu_idle() forward declarations
  nbd: zero from and len fields in NBD_CMD_DISCONNECT.
  mm: convert some level-less printks to pr_*
  MAINTAINERS: adi-buildroot-devel is moderated
  MAINTAINERS: add linux-api for review of API/ABI changes
  mm/kmemleak-test.c: use pr_fmt for logging
  fs/dlm/debug_fs.c: replace seq_printf by seq_puts
  fs/dlm/lockspace.c: convert simple_str to kstr
  fs/dlm/config.c: convert simple_str to kstr
  mm: mark remap_file_pages() syscall as deprecated
  mm: memcontrol: remove unnecessary memcg argument from soft limit functions
  mm: memcontrol: clean up memcg zoneinfo lookup
  mm/memblock.c: call kmemleak directly from memblock_(alloc|free)
  mm/mempool.c: update the kmemleak stack trace for mempool allocations
  lib/radix-tree.c: update the kmemleak stack trace for radix tree allocations
  mm: introduce kmemleak_update_trace()
  mm/kmemleak.c: use %u to print ->checksum
  ...

1 files changed, 26 insertions, 13 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index d6777060449..e03dd29145a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -239,6 +239,12 @@ struct vm_operations_struct {
 	 */
 	int (*access)(struct vm_area_struct *vma, unsigned long addr,
 		      void *buf, int len, int write);
+
+	/* Called by the /proc/PID/maps code to ask the vma whether it
+	 * has a special name.  Returning non-NULL will also cause this
+	 * vma to be dumped unconditionally. */
+	const char *(*name)(struct vm_area_struct *vma);
+
 #ifdef CONFIG_NUMA
 	/*
 	 * set_policy() op must add a reference to any non-NULL @new mempolicy
@@ -407,20 +413,25 @@ static inline void compound_unlock_irqrestore(struct page *page,
 #endif
 }
 
+static inline struct page *compound_head_by_tail(struct page *tail)
+{
+	struct page *head = tail->first_page;
+
+	/*
+	 * page->first_page may be a dangling pointer to an old
+	 * compound page, so recheck that it is still a tail
+	 * page before returning.
+	 */
+	smp_rmb();
+	if (likely(PageTail(tail)))
+		return head;
+	return tail;
+}
+
 static inline struct page *compound_head(struct page *page)
 {
-	if (unlikely(PageTail(page))) {
-		struct page *head = page->first_page;
-
-		/*
-		 * page->first_page may be a dangling pointer to an old
-		 * compound page, so recheck that it is still a tail
-		 * page before returning.
-		 */
-		smp_rmb();
-		if (likely(PageTail(page)))
-			return head;
-	}
+	if (unlikely(PageTail(page)))
+		return compound_head_by_tail(page);
 	return page;
 }
 
@@ -1778,7 +1789,9 @@ extern struct file *get_mm_exe_file(struct mm_struct *mm);
 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
 				   unsigned long addr, unsigned long len,
-				   unsigned long flags, struct page **pages);
+				   unsigned long flags,
+				   const struct vm_special_mapping *spec);
+/* This is an obsolete alternative to _install_special_mapping. */
 extern int install_special_mapping(struct mm_struct *mm,
 				   unsigned long addr, unsigned long len,
 				   unsigned long flags, struct page **pages);