linux-kernel - Re: [PATCH] kernel: fix data race in put

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Date:	Fri, 18 Sep 2015 15:31:34 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Dmitry Vyukov <dvyukov@...gle.com>, ebiederm@...ssion.com,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>, mhocko@...e.cz,
	LKML <linux-kernel@...r.kernel.org>, ktsan@...glegroups.com,
	Kostya Serebryany <kcc@...gle.com>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Hans Boehm <hboehm@...gle.com>
Subject: Re: [PATCH] kernel: fix data race in put_pid

Damn, sorry for noise,

On 09/18, Oleg Nesterov wrote:
>
> Now. In theory this this code is wrong:
>
> 	if (Y) {
> 		BUG_ON(X == 0);
> 	}

Of course without READ_ONCE() or barrier() in between this code
is buggy in any case. But I hope you understand what I tried to
say...

Oleg.

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