memcg: don't check mm in __memcg_kmem_{get_cache,newpage_charge}

We already assured the current task has mm in memcg_kmem_should_charge,
no need to double check.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e8bf0fc..37f345e 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2856,7 +2856,7 @@ struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep,
        VM_BUG_ON(!cachep->memcg_params);
        VM_BUG_ON(!cachep->memcg_params->is_root_cache);
 
-       if (!current->mm || current->memcg_kmem_skip_account)
+       if (current->memcg_kmem_skip_account)
                return cachep;
 
        rcu_read_lock();
@@ -2942,7 +2942,7 @@ __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **_memcg, int order)
         * allocations are extremely rare but can happen, for instance, for the
         * cache arrays. We bring this test here.
         */
-       if (!current->mm || current->memcg_kmem_skip_account)
+       if (current->memcg_kmem_skip_account)
                return true;
 
        memcg = get_mem_cgroup_from_mm(current->mm);