Re: [slubllv5 07/25] x86: Add support for cmpxchg_double

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On Thu, 26 May 2011, Eric Dumazet wrote:

> > +#define cmpxchg16b(ptr, o1, o2, n1, n2)				\
> > +({								\
> > +	char __ret;						\
> > +	__typeof__(o2) __junk;					\
> > +	__typeof__(*(ptr)) __old1 = (o1);			\
> > +	__typeof__(o2) __old2 = (o2);				\
> > +	__typeof__(*(ptr)) __new1 = (n1);			\
> > +	__typeof__(o2) __new2 = (n2);				\
> > +	asm volatile(LOCK_PREFIX_HERE "lock; cmpxchg16b (%%rsi);setz %1" \
>
> If there is no emulation, why do you force rsi here ?
>
> It could be something else, like "=m" (*ptr) ?
>
> (same remark for other functions)

Well I ran into trouble with =m. Maybe +m will do. Will try again.

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