Messages in this thread Patch in this message | | | From | Alex Shi <> | Subject | [PATCH next-akpm] mm/memcg: add missed warning in mem_cgroup_lruvec | Date | Fri, 20 Nov 2020 17:30:03 +0800 |
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commit "(mm/memcontrol:rewrite mem_cgroup_page_lruvec())" on mm tree use mem_cgroup_lruvec to rewrite mem_cgroup_page_lruvec, but it missed a DEBUG_VM warning as following, since we always charge a page before return from allocation. Add back this warning is helpful:
VM_WARN_ON_ONCE_PAGE(!memcg, page);
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Shakeel Butt <shakeelb@google.com> Cc: Roman Gushchin <guro@fb.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Yafang Shao <laoar.shao@gmail.com> Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com> Cc: Hui Su <sh_def@163.com> Cc: Wei Yang <richard.weiyang@gmail.com> Cc: linux-kernel@vger.kernel.org --- include/linux/memcontrol.h | 1 + 1 file changed, 1 insertion(+)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 925b09ace986..7809020ef7bd 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -618,6 +618,7 @@ static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg, goto out; } + VM_WARN_ON_ONCE_PAGE(!memcg, page); if (!memcg) memcg = root_mem_cgroup; -- 2.29.GIT
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