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[108.176.24.99]) by smtp.gmail.com with ESMTPSA id o8sm3924052qkg.60.2019.01.31.20.57.12 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 31 Jan 2019 20:57:12 -0800 (PST) Date: Thu, 31 Jan 2019 23:57:11 -0500 From: Chris Down To: Andrew Morton Cc: Tetsuo Handa , Johannes Weiner , Tejun Heo , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH] mm, memcg: Handle cgroup_disable=memory when getting memcg protection Message-ID: <20190201045711.GA18302@chrisdown.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.11.2 (2019-01-07) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: memcg is NULL if we have CONFIG_MEMCG set, but cgroup_disable=memory on the kernel command line. Fixes: 8a907cdf0177ab40 ("mm, memcg: proportional memory.{low,min} reclaim") Reported-by: Tetsuo Handa Signed-off-by: Chris Down Cc: Andrew Morton Cc: Johannes Weiner Cc: Tejun Heo Cc: linux-kernel@vger.kernel.org Cc: cgroups@vger.kernel.org Cc: linux-mm@kvack.org --- include/linux/memcontrol.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 290cfbfd60cd..49742489aa56 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -335,6 +335,9 @@ static inline bool mem_cgroup_disabled(void) static inline unsigned long mem_cgroup_protection(struct mem_cgroup *memcg) { + if (mem_cgroup_disabled()) + return 0; + return max(READ_ONCE(memcg->memory.emin), READ_ONCE(memcg->memory.elow)); } -- 2.20.1