tracepoints: use modules notifiers

[deliverable/linux.git] / include / linux / rmap.h

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 1383692ac5bd8c8dc5c06498a38795a256f56c93..89f0564b10c8f7c81951b571e98dbd5ef88a40a4 100644 (file)
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -26,23 +26,19 @@
  */
 struct anon_vma {
        spinlock_t lock;        /* Serialize access to vma list */
+       /*
+        * NOTE: the LSB of the head.next is set by
+        * mm_take_all_locks() _after_ taking the above lock. So the
+        * head must only be read/written after taking the above lock
+        * to be sure to see a valid next pointer. The LSB bit itself
+        * is serialized by a system wide lock only visible to
+        * mm_take_all_locks() (mm_all_locks_mutex).
+        */
        struct list_head head;  /* List of private "related" vmas */
 };
 
 #ifdef CONFIG_MMU
 
-extern struct kmem_cache *anon_vma_cachep;
-
-static inline struct anon_vma *anon_vma_alloc(void)
-{
-       return kmem_cache_alloc(anon_vma_cachep, GFP_KERNEL);
-}
-
-static inline void anon_vma_free(struct anon_vma *anon_vma)
-{
-       kmem_cache_free(anon_vma_cachep, anon_vma);
-}
-
 static inline void anon_vma_lock(struct vm_area_struct *vma)
 {
        struct anon_vma *anon_vma = vma->anon_vma;
@@ -67,6 +63,9 @@ void anon_vma_unlink(struct vm_area_struct *);
 void anon_vma_link(struct vm_area_struct *);
 void __anon_vma_link(struct vm_area_struct *);
 
+extern struct anon_vma *page_lock_anon_vma(struct page *page);
+extern void page_unlock_anon_vma(struct anon_vma *anon_vma);
+
 /*
  * rmap interfaces called when adding or removing pte of page
  */
@@ -94,7 +93,7 @@ int try_to_unmap(struct page *, int ignore_refs);
  * Called from mm/filemap_xip.c to unmap empty zero page
  */
 pte_t *page_check_address(struct page *, struct mm_struct *,
-                               unsigned long, spinlock_t **);
+                               unsigned long, spinlock_t **, int);
 
 /*
  * Used by swapoff to help locate where page is expected in vma.
@@ -109,6 +108,19 @@ unsigned long page_address_in_vma(struct page *, struct vm_area_struct *);
  */
 int page_mkclean(struct page *);
 
+#ifdef CONFIG_UNEVICTABLE_LRU
+/*
+ * called in munlock()/munmap() path to check for other vmas holding
+ * the page mlocked.
+ */
+int try_to_munlock(struct page *);
+#else
+static inline int try_to_munlock(struct page *page)
+{
+       return 0;       /* a.k.a. SWAP_SUCCESS */
+}
+#endif
+
 #else  /* !CONFIG_MMU */
 
 #define anon_vma_init()                do {} while (0)
@@ -132,5 +144,6 @@ static inline int page_mkclean(struct page *page)
 #define SWAP_SUCCESS   0
 #define SWAP_AGAIN     1
 #define SWAP_FAIL      2
+#define SWAP_MLOCK     3
 
 #endif /* _LINUX_RMAP_H */