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[71.184.117.43]) by smtp.gmail.com with ESMTPSA id s27sm4943171qkm.97.2020.01.13.05.42.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Jan 2020 05:42:56 -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] sched/core: fix illegal RCU from offline CPUs Date: Mon, 13 Jan 2020 08:42:55 -0500 Message-Id: <58C3C45A-1C05-4900-B82D-5AAF7538B9C8@lca.pw> References: <66e33eb5-e958-6dc8-2327-4168afdd9e1e@i-love.sakura.ne.jp> Cc: Peter Zijlstra , Ingo Molnar , juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, "Steven Rostedt (VMware)" , bsegall@google.com, mgorman@suse.de, paulmck@kernel.org, tglx@linutronix.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org In-Reply-To: <66e33eb5-e958-6dc8-2327-4168afdd9e1e@i-love.sakura.ne.jp> To: Tetsuo Handa 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 Jan 13, 2020, at 3:22 AM, Tetsuo Handa wrote: >=20 > Is commit 7283094ec3db318e ("kernel, oom: fix potential pgd_lock deadlock f= rom > __mmdrop") about only softirq? Is it guaranteed that smp_call_function_sin= gle() > does not hit such race? Then just my overcareful... That commit looks like a different issue. We are not call mmdrop() from soft= irq here.=