linux-kernel - Re: [PATCH 1/8] stop_machine: cpu_stopper

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Message-ID: <20151116185221.GK18894@mtj.duckdns.org>
Date:	Mon, 16 Nov 2015 13:52:21 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Milos Vyletel <milos@...hat.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] stop_machine: cpu_stopper_thread() must check done
 != NULL

On Sun, Nov 15, 2015 at 08:33:11PM +0100, Oleg Nesterov wrote:
> stop_one_cpu_nowait(fn) will crash the kernel if the callback returns
> nonzero, work->done == NULL in this case.
> 
> This needs more cleanups, cpu_stop_signal_done() is called right after
> we check done != NULL and it does the same check.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Tejun Heo <tj@...nel.org>

cc stable?

Thanks.

-- 
tejun
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