linux-kernel - Re: [PATCH] sched/core: fix illegal RCU from offline CPUs

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Date:   Mon, 13 Jan 2020 08:42:55 -0500
From:   Qian Cai <cai@....pw>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        bsegall@...gle.com, mgorman@...e.de, paulmck@...nel.org,
        tglx@...utronix.de, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/core: fix illegal RCU from offline CPUs



> On Jan 13, 2020, at 3:22 AM, Tetsuo Handa <penguin-kernel@...ove.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.