Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton:

 - fsnotify fix

 - poll() timeout fix

 - a few scripts/ tweaks

 - debugobjects updates

 - the (small) ocfs2 queue

 - Minor fixes to kernel/padata.c

 - Maybe half of the MM queue

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (117 commits)
  mm, page_alloc: restore the original nodemask if the fast path allocation failed
  mm, page_alloc: uninline the bad page part of check_new_page()
  mm, page_alloc: don't duplicate code in free_pcp_prepare
  mm, page_alloc: defer debugging checks of pages allocated from the PCP
  mm, page_alloc: defer debugging checks of freed pages until a PCP drain
  cpuset: use static key better and convert to new API
  mm, page_alloc: inline pageblock lookup in page free fast paths
  mm, page_alloc: remove unnecessary variable from free_pcppages_bulk
  mm, page_alloc: pull out side effects from free_pages_check
  mm, page_alloc: un-inline the bad part of free_pages_check
  mm, page_alloc: check multiple page fields with a single branch
  mm, page_alloc: remove field from alloc_context
  mm, page_alloc: avoid looking up the first zone in a zonelist twice
  mm, page_alloc: shortcut watermark checks for order-0 pages
  mm, page_alloc: reduce cost of fair zone allocation policy retry
  mm, page_alloc: shorten the page allocator fast path
  mm, page_alloc: check once if a zone has isolated pageblocks
  mm, page_alloc: move __GFP_HARDWALL modifications out of the fastpath
  mm, page_alloc: simplify last cpupid reset
  mm, page_alloc: remove unnecessary initialisation from __alloc_pages_nodemask()
  ...

1 files changed, 24 insertions, 23 deletions

diff --git a/mm/mremap.c b/mm/mremap.c
index 3fa0a467df66..9dc499977924 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -70,6 +70,22 @@ static pmd_t *alloc_new_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
 	return pmd;
 }
 
+static void take_rmap_locks(struct vm_area_struct *vma)
+{
+	if (vma->vm_file)
+		i_mmap_lock_write(vma->vm_file->f_mapping);
+	if (vma->anon_vma)
+		anon_vma_lock_write(vma->anon_vma);
+}
+
+static void drop_rmap_locks(struct vm_area_struct *vma)
+{
+	if (vma->anon_vma)
+		anon_vma_unlock_write(vma->anon_vma);
+	if (vma->vm_file)
+		i_mmap_unlock_write(vma->vm_file->f_mapping);
+}
+
 static pte_t move_soft_dirty_pte(pte_t pte)
 {
 	/*
@@ -90,8 +106,6 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
 		struct vm_area_struct *new_vma, pmd_t *new_pmd,
 		unsigned long new_addr, bool need_rmap_locks)
 {
-	struct address_space *mapping = NULL;
-	struct anon_vma *anon_vma = NULL;
 	struct mm_struct *mm = vma->vm_mm;
 	pte_t *old_pte, *new_pte, pte;
 	spinlock_t *old_ptl, *new_ptl;
@@ -114,16 +128,8 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
 	 *   serialize access to individual ptes, but only rmap traversal
 	 *   order guarantees that we won't miss both the old and new ptes).
 	 */
-	if (need_rmap_locks) {
-		if (vma->vm_file) {
-			mapping = vma->vm_file->f_mapping;
-			i_mmap_lock_write(mapping);
-		}
-		if (vma->anon_vma) {
-			anon_vma = vma->anon_vma;
-			anon_vma_lock_write(anon_vma);
-		}
-	}
+	if (need_rmap_locks)
+		take_rmap_locks(vma);
 
 	/*
 	 * We don't have to worry about the ordering of src and dst
@@ -151,10 +157,8 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
 		spin_unlock(new_ptl);
 	pte_unmap(new_pte - 1);
 	pte_unmap_unlock(old_pte - 1, old_ptl);
-	if (anon_vma)
-		anon_vma_unlock_write(anon_vma);
-	if (mapping)
-		i_mmap_unlock_write(mapping);
+	if (need_rmap_locks)
+		drop_rmap_locks(vma);
 }
 
 #define LATENCY_LIMIT	(64 * PAGE_SIZE)
@@ -193,16 +197,13 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
 		if (pmd_trans_huge(*old_pmd)) {
 			if (extent == HPAGE_PMD_SIZE) {
 				bool moved;
-				VM_BUG_ON_VMA(vma->vm_file || !vma->anon_vma,
-					      vma);
 				/* See comment in move_ptes() */
 				if (need_rmap_locks)
-					anon_vma_lock_write(vma->anon_vma);
-				moved = move_huge_pmd(vma, new_vma, old_addr,
-						    new_addr, old_end,
-						    old_pmd, new_pmd);
+					take_rmap_locks(vma);
+				moved = move_huge_pmd(vma, old_addr, new_addr,
+						    old_end, old_pmd, new_pmd);
 				if (need_rmap_locks)
-					anon_vma_unlock_write(vma->anon_vma);
+					drop_rmap_locks(vma);
 				if (moved) {
 					need_flush = true;
 					continue;