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From: Qian Cai <cai@lca.pw>
To: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	juri.lelli@redhat.com, vincent.guittot@linaro.org,
	dietmar.eggemann@arm.com,
	"Steven Rostedt (VMware)" <rostedt@goodmis.org>,
	bsegall@google.com, mgorman@suse.de, paulmck@kernel.org,
	tglx@linutronix.de, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sched/core: fix illegal RCU from offline CPUs
Date: Mon, 13 Jan 2020 08:42:55 -0500	[thread overview]
Message-ID: <58C3C45A-1C05-4900-B82D-5AAF7538B9C8@lca.pw> (raw)
In-Reply-To: <66e33eb5-e958-6dc8-2327-4168afdd9e1e@i-love.sakura.ne.jp>



> On Jan 13, 2020, at 3:22 AM, Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> wrote:
> 
> Is commit 7283094ec3db318e ("kernel, oom: fix potential pgd_lock deadlock from
> __mmdrop") about only softirq? Is it guaranteed that smp_call_function_single()
> does not hit such race? Then just my overcareful...

That commit looks like a different issue. We are not call mmdrop() from softirq here.

      reply	other threads:[~2020-01-13 13:43 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-12 16:17 [PATCH] sched/core: fix illegal RCU from offline CPUs Qian Cai
2020-01-13  0:33 ` Tetsuo Handa
2020-01-13  6:30   ` Qian Cai
2020-01-13  8:20     ` Tetsuo Handa
2020-01-13 13:42       ` Qian Cai [this message]

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