Users pass either a mm that has been established under task lock, or use a verified current->mm, which means the task can't be exiting.
Signed-off-by: Johannes Weiner <han...@cmpxchg.org> --- mm/memcontrol.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index e1d7f33227e4..689fffdee471 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1075,13 +1075,6 @@ struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) { struct mem_cgroup *memcg = NULL; - if (!mm) - return NULL; - /* - * Because we have no locks, mm->owner's may be being moved to other - * cgroup. We use css_tryget() here even if this looks - * pessimistic (rather than adding locks here). - */ rcu_read_lock(); do { memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); -- 1.8.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/