• Vladimir Davydov's avatar
    mm: memcontrol: zap memcg_kmem_online helper · b6ecd2de
    Vladimir Davydov authored
    
    
    As kmem accounting is now either enabled for all cgroups or disabled
    system-wide, there's no point in having memcg_kmem_online() helper -
    instead one can use memcg_kmem_enabled() and mem_cgroup_online(), as
    shrink_slab() now does.
    
    There are only two places left where this helper is used -
    __memcg_kmem_charge() and memcg_create_kmem_cache().  The former can
    only be called if memcg_kmem_enabled() returned true.  Since the cgroup
    it operates on is online, mem_cgroup_is_root() check will be enough.
    
    memcg_create_kmem_cache() can't use mem_cgroup_online() helper instead
    of memcg_kmem_online(), because it relies on the fact that in
    memcg_offline_kmem() memcg->kmem_state is changed before
    memcg_deactivate_kmem_caches() is called, but there we can just
    open-code the check.
    Signed-off-by: default avatarVladimir Davydov <vdavydov@virtuozzo.com>
    Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
    Cc: Michal Hocko <mhocko@kernel.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    b6ecd2de