linux-kernel - Re: [git pull] core/percpu for v2.6.27

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Message-ID: <alpine.LFD.1.10.0807141525000.2944@woody.linux-foundation.org>
Date:	Mon, 14 Jul 2008 15:27:06 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [git pull] core/percpu for v2.6.27



On Mon, 14 Jul 2008, Ingo Molnar wrote:
> 
> Please pull the latest core/percpu git tree from:
> 
>    git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git core/percpu

Can you explain what this does and who needs it? The percpu_xchg() looks 
particularly pointless, since it's always a locked SMP-safe instruction on 
x86, so a nonpreemptible load+store will likely be much faster.

			Linus
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