mm, writeback: prevent race when calculating dirty limits

Setting vm_dirty_bytes and dirty_background_bytes is not protected by
any serialization.

Therefore, it's possible for either variable to change value after the
test in global_dirty_limits() to determine whether available_memory
needs to be initialized or not.

Always ensure that available_memory is properly initialized.

Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index e0c943014eb74ce3d4cb4c021d6f896740386d6d..91d73ef1744d6fbc5c4bbdf9782beb3b3e22da6b 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -261,14 +261,11 @@ static unsigned long global_dirtyable_memory(void)
  */
 void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty)
 {
+       const unsigned long available_memory = global_dirtyable_memory();
        unsigned long background;
        unsigned long dirty;
-       unsigned long uninitialized_var(available_memory);
        struct task_struct *tsk;
 
-       if (!vm_dirty_bytes || !dirty_background_bytes)
-               available_memory = global_dirtyable_memory();
-
        if (vm_dirty_bytes)
                dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE);
        else