linux-kernel - Re: [tip:perfcounters/urgent] x86: atomic64: Fix unclean type use in atomic64

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Message-ID: <alpine.LFD.2.01.0907031000590.3210@localhost.localdomain>
Date:	Fri, 3 Jul 2009 10:02:14 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	mingo@...hat.com, hpa@...or.com, paulus@...ba.org, acme@...hat.com,
	linux-kernel@...r.kernel.org, eric.dumazet@...il.com,
	a.p.zijlstra@...llo.nl, efault@....de, arnd@...db.de,
	fweisbec@...il.com, dhowells@...hat.com, akpm@...ux-foundation.org,
	tglx@...utronix.de, mingo@...e.hu
cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/urgent] x86: atomic64: Fix unclean type use
 in atomic64_xchg()



On Fri, 3 Jul 2009, tip-bot for Ingo Molnar wrote:
> 
> Fix atomic64_xchg() to use __atomic64_read() instead.

Hmm. The whole __atomic64_read() thing should be dropped. Are there any 
users? None of them should be valid, as Eric's numbers showed. It's 
apparently better to start out with a random value rather than actually 
trying to read it.

		Linus
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