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[71.184.117.43]) by smtp.gmail.com with ESMTPSA id t7sm7120087qkm.136.2019.12.17.07.17.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Dec 2019 07:17:11 -0800 (PST) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [PATCH] mm: memcontrol.c: move mem_cgroup_id_get_many under CONFIG_MMU Date: Tue, 17 Dec 2019 10:17:10 -0500 Message-Id: References: <20191217151343.GC7272@dhcp22.suse.cz> Cc: Chris Down , Kuninori Morimoto , Johannes Weiner , Vladimir Davydov , Andrew Morton , cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org In-Reply-To: <20191217151343.GC7272@dhcp22.suse.cz> To: Michal Hocko X-Mailer: iPhone Mail (17C54) 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: > On Dec 17, 2019, at 10:13 AM, Michal Hocko wrote: >=20 > I do understand the general purpose of the warning. I am simply not sure > the kernel tree is a good candidate with a huge number of different > config combinations that might easily result in warnings which would > tend to result in even more ifdeferry than we have. Yes, compiling test without real-world use case is evil. Once we ignore the e= vil, it becomes much more manageable.=