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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 <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2011-03-23 16:42:23 -07:00 committed by Linus Torvalds
parent 3403968d7a
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);