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memcg: charged pages always have valid per-memcg zone info

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page_cgroup_zoneinfo() will never return NULL for a charged page, remove
the check for it in mem_cgroup_get_reclaim_stat_from_page().

Signed-off-by: Johannes Weiner <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Daisuke Nishimura <[email protected]>
Cc: Balbir Singh <[email protected]>
Reviewed-by: 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 16:42:31 -07:00 • committed by Linus Torvalds
commit 4dc03de1b2
1 changed files with 0 additions and 3 deletions
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3
mm/memcontrol.c
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@ -1043,9 +1043,6 @@ mem_cgroup_get_reclaim_stat_from_page(struct page *page)
/* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
smp_rmb();
mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
if (!mz)
return NULL;
return &mz->reclaim_stat;
}