cgroup: remove unnecessary 0 check from css_from_id()
authorJohannes Weiner <hannes@cmpxchg.org>
Tue, 26 Jul 2016 22:27:01 +0000 (15:27 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 26 Jul 2016 23:19:19 +0000 (16:19 -0700)
commitcb773df88a737d7d7e05ca7ca516414d3fcdcab8
treec5115d320c993dbfb26f3948460df3c6d4720e27
parent1fe4d021acbc356723818a633fe0a10c59c2a4c1
cgroup: remove unnecessary 0 check from css_from_id()

css_idr allocation starts at 1, so index 0 will never point to an item.
css_from_id() currently filters that before asking idr_find(), but
idr_find() would also just return NULL, so this is not needed.

Link: http://lkml.kernel.org/r/20160617162427.GC19084@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/cgroup.c