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    SubjectRe: Linux 2.6.32-rc1


    On Wed, 30 Sep 2009, Eric Dumazet wrote:
    > > +#define cmpxchg64(ptr, o, n) \
    > > +({ \
    > > + __typeof__(*(ptr)) __ret; \
    > > + __typeof__(*(ptr)) __old = (o); \
    > > + __typeof__(*(ptr)) __new = (n); \
    > > + alternative_io("call cmpxchg8b_emu", \
    > > + "lock; cmpxchg8b (%%esi)" , \
    > > + X86_FEATURE_CX8, \
    > > + "=A" (__ret), \
    > > + "S" ((ptr)), "0" (__old), \
    > > + "b" ((unsigned int)__new), \
    > > + "c" ((unsigned int)(__new>>32))); \
    >
    > probably a "memory" clobber is needed, alternative_io() doesnt provide it.

    Yeah, good catch.

    Linus


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