cgroup, memcg, writeback: drop spurious rcu locking around mem_cgroup_css_from_page()

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In earlier versions, mem_cgroup_css_from_page() could return non-root
css on a legacy hierarchy which can go away and required rcu locking;
however, the eventual version simply returns the root cgroup if memcg is
on a legacy hierarchy and thus doesn't need rcu locking around or in it.
Remove spurious rcu lockings.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Tejun Heo 2016-01-15 16:57:16 -08:00 • committed by Linus Torvalds

parent 6f8d2b8a26

commit 654a0dd095

2 changed files with 0 additions and 5 deletions

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fs/fs-writeback.c

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