Re: [PATCH -tip] x86: atomic64: inline atomic64_read()

[Arjan van de Ven]

On Fri, 3 Jul 2009 20:04:50 +0200
Ingo Molnar <mingo@xxxxxxx> 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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