Add unlikely() to indicate that underflow of per-cpu counter
sum is not expected.
The underflow is already handled, but should have been
marked unlikely.
Reported-by: Wu Fengguang <[email protected]>
Signed-off-by: Greg Thelen <[email protected]>
---
mm/memcontrol.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ed070d0..e8fbade 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1393,7 +1393,7 @@ unsigned long mem_cgroup_page_stat(struct mem_cgroup *mem,
* value. This function returns an unsigned value, so round it up to
* zero to avoid returning a very large value.
*/
- if (value < 0)
+ if (unlikely(value < 0))
value = 0;
put_online_cpus();
--
1.7.3.1