linux-kernel - Re: [PATCH 37/40] alpha: Replace __get_cpu

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Message-ID: <CAMo8BfJY0rGLyeOwjmrzRw4h2AedF33D3iPXDe+umHDXt5=nQw@mail.gmail.com>
Date:	Fri, 20 Dec 2013 01:47:11 +0400
From:	Max Filippov <jcmvbkbc@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Tejun Heo <tj@...nel.org>, akpm@...uxfoundation.org,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>
Subject: Re: [PATCH 37/40] alpha: Replace __get_cpu_var

Hi,

On Thu, Dec 19, 2013 at 7:50 PM, Christoph Lameter <cl@...ux.com> wrote:

[...]

> 5. Assignment to a per cpu variable
>
>         DEFINE_PER_CPU(int, y)
>         __get_cpu_var(y) = x;
>
>    Converts to
>
>         this_cpu_write(y, x);

Doesn't it actually convert to __this_cpu_write(y, x); as there were
no atomicity in the original assignment?

-- 
Thanks.
-- Max
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