Date: Fri, 3 Jul 2009 11:10:33 -0700
From: Arjan van de Ven <arjan@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
       Linus Torvalds <torvalds@linux-foundation.org>, mingo@redhat.com,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH -tip] x86: atomic64: inline atomic64_read()
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On Fri, 3 Jul 2009 20:04:50 +0200
Ingo Molnar <mingo@elte.hu> wrote:

> > +static inline u64 atomic64_read(atomic64_t *ptr)
> > +{
> > +	u64 res;
> > +
> > +	asm volatile(
> > +		"mov %%ebx, %%eax\n\t"
> > +		"mov %%ecx, %%edx\n\t"
> > +		LOCK_PREFIX "cmpxchg8b %1\n"

also afaik cmpxchg implies the lock prefix, so no need to make an
explicit one... it just adds code size and alternatives-work
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