Revert "cpusets: randomize node rotor used in cpuset_mem_spread_node()"

[pandora-kernel.git] / include / linux / rmap.h

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index d25bd22..7721674 100644 (file)
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -26,8 +26,17 @@
  */
 struct anon_vma {
        spinlock_t lock;        /* Serialize access to vma list */
-#ifdef CONFIG_KSM
-       atomic_t ksm_refcount;
+#if defined(CONFIG_KSM) || defined(CONFIG_MIGRATION)
+
+       /*
+        * The external_refcount is taken by either KSM or page migration
+        * to take a reference to an anon_vma when there is no
+        * guarantee that the vma of page tables will exist for
+        * the duration of the operation. A caller that takes
+        * the reference is responsible for clearing up the
+        * anon_vma if they are the last user on release
+        */
+       atomic_t external_refcount;
 #endif
        /*
         * NOTE: the LSB of the head.next is set by
@@ -61,22 +70,22 @@ struct anon_vma_chain {
 };
 
 #ifdef CONFIG_MMU
-#ifdef CONFIG_KSM
-static inline void ksm_refcount_init(struct anon_vma *anon_vma)
+#if defined(CONFIG_KSM) || defined(CONFIG_MIGRATION)
+static inline void anonvma_external_refcount_init(struct anon_vma *anon_vma)
 {
-       atomic_set(&anon_vma->ksm_refcount, 0);
+       atomic_set(&anon_vma->external_refcount, 0);
 }
 
-static inline int ksm_refcount(struct anon_vma *anon_vma)
+static inline int anonvma_external_refcount(struct anon_vma *anon_vma)
 {
-       return atomic_read(&anon_vma->ksm_refcount);
+       return atomic_read(&anon_vma->external_refcount);
 }
 #else
-static inline void ksm_refcount_init(struct anon_vma *anon_vma)
+static inline void anonvma_external_refcount_init(struct anon_vma *anon_vma)
 {
 }
 
-static inline int ksm_refcount(struct anon_vma *anon_vma)
+static inline int anonvma_external_refcount(struct anon_vma *anon_vma)
 {
        return 0;
 }