mm/memcontrol.c: remove redundant BUG_ON() in mem_cgroup_usage_unregister_event()

In the following code:

	if (type == _MEM)
		thresholds = &memcg->thresholds;
	else if (type == _MEMSWAP)
		thresholds = &memcg->memsw_thresholds;
	else
		BUG();

	BUG_ON(!thresholds);

The BUG_ON() seems redundant.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c200875..4dc9709 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4467,12 +4467,6 @@ static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp,
        else
                BUG();
 
-       /*
-        * Something went wrong if we trying to unregister a threshold
-        * if we don't have thresholds
-        */
-       BUG_ON(!thresholds);
-
        if (!thresholds->primary)
                goto unlock;