linux-kernel - Re: [PATCH -tip] x86: atomic64: inline atomic64

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Message-ID: <87k52paaja.fsf@basil.nowhere.org>
Date:	Fri, 03 Jul 2009 20:25:45 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip] x86: atomic64: inline atomic64_read()

Ingo Molnar <mingo@...e.hu> writes:
>
> Is the same true of XADD as well? If yes then we can remove the lock 
> prefix from those as well - there's a few uses of that on 32-bit and 
> 64-bit as well.

XADD also has no implicit LOCK. AFAIK the implicit semantics are 
only true for XCHG.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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