linux-kernel - Re: [PATCH 0/2] cpustat: use atomic operations to read/update stats

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Message-ID: <1361540926.26780.56.camel@laptop>
Date:	Fri, 22 Feb 2013 14:48:46 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Kevin Hilman <khilman@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 0/2] cpustat: use atomic operations to read/update stats

On Fri, 2013-02-22 at 13:50 +0100, Frederic Weisbecker wrote:
> atomic64_read() and atomic64_set() are supposed to take care of that,
> without
> even the need for _inc() or _add() parts that use LOCK.

Are you sure? Generally atomic*_set() is not actually an atomic
operation.

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