1 files changed, 27 insertions, 3 deletions

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 31b2fd75dcba..bb83c0da2071 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -25,8 +25,8 @@
  * pointing to this anon_vma once its vma list is empty.
  */
 struct anon_vma {
-        spinlock_t lock;        /* Serialize access to vma list */
         struct anon_vma *root;  /* Root of this anon_vma tree */
+        spinlock_t lock;        /* Serialize access to vma list */
 #if defined(CONFIG_KSM) || defined(CONFIG_MIGRATION)
 
         /*
@@ -205,9 +205,20 @@ int try_to_unmap_one(struct page *, struct vm_area_struct *,
 /*
  * Called from mm/filemap_xip.c to unmap empty zero page
  */
-pte_t *page_check_address(struct page *, struct mm_struct *,
+pte_t *__page_check_address(struct page *, struct mm_struct *,
                                 unsigned long, spinlock_t **, int);
 
+static inline pte_t *page_check_address(struct page *page, struct mm_struct *mm,
+                                        unsigned long address,
+                                        spinlock_t **ptlp, int sync)
+{
+        pte_t *ptep;
+
+        __cond_lock(*ptlp, ptep = __page_check_address(page, mm, address,
+                                                       ptlp, sync));
+        return ptep;
+}
+
 /*
  * Used by swapoff to help locate where page is expected in vma.
  */
@@ -230,7 +241,20 @@ int try_to_munlock(struct page *);
 /*
  * Called by memory-failure.c to kill processes.
  */
-struct anon_vma *page_lock_anon_vma(struct page *page);
+struct anon_vma *__page_lock_anon_vma(struct page *page);
+
+static inline struct anon_vma *page_lock_anon_vma(struct page *page)
+{
+        struct anon_vma *anon_vma;
+
+        __cond_lock(RCU, anon_vma = __page_lock_anon_vma(page));
+
+        /* (void) is needed to make gcc happy */
+        (void) __cond_lock(&anon_vma->root->lock, anon_vma);
+
+        return anon_vma;
+}
+
 void page_unlock_anon_vma(struct anon_vma *anon_vma);
 int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma);