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memcg: remove impossible conditional when committing

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No callsite ever passes a NULL pointer for a struct mem_cgroup * to the
committing function.  There is no need to check for it.

Signed-off-by: Johannes Weiner <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Daisuke Nishimura <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Johannes Weiner 2011-03-23 16:42:23 -07:00 • committed by Linus Torvalds
commit c14f35c70e
1 changed files with 0 additions and 4 deletions
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4
mm/memcontrol.c
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@ -2118,10 +2118,6 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *mem,
{
int nr_pages = page_size >> PAGE_SHIFT;
/* try_charge() can return NULL to *memcg, taking care of it. */
if (!mem)
return;
lock_page_cgroup(pc);
if (unlikely(PageCgroupUsed(pc))) {
unlock_page_cgroup(pc);