memcg: remove activate_kmem_mutex
The activate_kmem_mutex is used to serialize memcg.kmem.limit updates, but we already serialize them with memcg_limit_mutex so let's remove the former. Signed-off-by: NVladimir Davydov <vdavydov@parallels.com> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Acked-by: NMichal Hocko <mhocko@suse.cz> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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