linux-kernel - [PATCH next-akpm] mm/memcg: add missed warning in mem_cgroup

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Message-Id: <1605864603-49118-1-git-send-email-alex.shi@linux.alibaba.com>
Date:   Fri, 20 Nov 2020 17:30:03 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...e.com>,
        Yafang Shao <laoar.shao@...il.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Hui Su <sh_def@....com>, Wei Yang <richard.weiyang@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH next-akpm] mm/memcg: add missed warning in mem_cgroup_lruvec

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@...ux.alibaba.com>
Cc: Andrew Morton <akpm@...ux-foundation.org> 
Cc: Johannes Weiner <hannes@...xchg.org> 
Cc: Shakeel Butt <shakeelb@...gle.com> 
Cc: Roman Gushchin <guro@...com> 
Cc: Michal Hocko <mhocko@...e.com> 
Cc: Yafang Shao <laoar.shao@...il.com> 
Cc: Alexander Duyck <alexander.h.duyck@...ux.intel.com> 
Cc: Hui Su <sh_def@....com>
Cc: Wei Yang <richard.weiyang@...il.com> 
Cc: linux-kernel@...r.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