From: Roman Gushchin <guro@xxxxxx> Subject: mm: kmem: remove redundant checks from get_obj_cgroup_from_current() There are checks for current->mm and current->active_memcg in get_obj_cgroup_from_current(), but these checks are redundant: memcg_kmem_bypass() called just above performs same checks. Link: http://lkml.kernel.org/r/20200827225843.1270629-3-guro@xxxxxx Signed-off-by: Roman Gushchin <guro@xxxxxx> Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/memcontrol.c | 3 --- 1 file changed, 3 deletions(-) --- a/mm/memcontrol.c~mm-kmem-remove-redundant-checks-from-get_obj_cgroup_from_current +++ a/mm/memcontrol.c @@ -2939,9 +2939,6 @@ __always_inline struct obj_cgroup *get_o if (memcg_kmem_bypass()) return NULL; - if (unlikely(!current->mm && !current->active_memcg)) - return NULL; - rcu_read_lock(); if (unlikely(current->active_memcg)) memcg = rcu_dereference(current->active_memcg); _
