Remove the deprecated cli() sti() functions

[linux-2.6] / include / linux / rmap.h

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 1383692ac5bd8c8dc5c06498a38795a256f56c93..69407f85e10b32daa4bd8ac82f88d43e36b82f78 100644 (file)
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -26,6 +26,14 @@
  */
 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 */
 };