linux-kernel - Re: [patch] add optimized generic percpu accessors

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Date:	Sat, 31 Jan 2009 17:00:24 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Tejun Heo <tj@...nel.org>,
	Brian Gerst <brgerst@...il.com>, ebiederm@...ssion.com,
	cl@...ux-foundation.org, rusty@...tcorp.com.au, travis@....com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	steiner@....com, hugh@...itas.com
Subject: Re: [patch] add optimized generic percpu accessors


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> So, upshot, I think the default versions should be wrapped in 
> preempt_disable/enable to preserve this interface invariant.

The default ones already are:

#define __percpu_generic_to_op(var, val, op)                            \
do {                                                                    \
        get_cpu_var(var) op val;                                        \
        put_cpu_var(var);                                               \
} while (0)

	Ingo
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