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

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Message-ID: <20150918121920.GE11639@twins.programming.kicks-ass.net>
Date:	Fri, 18 Sep 2015 14:19:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Will Deacon <will.deacon@....com>, Oleg Nesterov <oleg@...hat.com>,
	"ebiederm@...ssion.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" <mhocko@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	"ktsan@...glegroups.com" <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

On Fri, Sep 18, 2015 at 01:56:37PM +0200, Peter Zijlstra wrote:
> +#ifndef atomic64_read_ctrl
> +static inline int atomic64_read_ctrl(atomic64_t *v)
> +{
> +	int val = atomic64_read(v);

Duh

	long long...

> +	smp_read_barrier_depends(); /* Enforce control dependency. */
> +	return val;
> +}
> +#endif
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