On Mon, 31 Oct 2005, Nick Piggin wrote:
> Zwane Mwaikambo wrote:
> > Hi Nick,
> >
> > On Sun, 30 Oct 2005, Nick Piggin wrote:
> >
> > +#define cmpxchg(ptr,o,n) \
> > +({ \
> > + __typeof__(*(ptr)) __ret; \
> > + if (likely(boot_cpu_data.x86 > 3)) \
> > + __ret = __cmpxchg((ptr), (unsigned long)(o), \
> > + (unsigned long)(n), sizeof(*(ptr))); \
> > + else \
> > + __ret = cmpxchg_386((ptr), (unsigned long)(o), \
> > + (unsigned long)(n), sizeof(*(ptr))); \
> > + __ret; \
> > +})
> > +#endif
> >
> > How about something similar to the following to remove the branch on
> > optimised kernels?
> >
>
> This is only in the !CONFIG_X86_CMPXCHG case, though, so the branch would
> only be there on a 386 kernel, I think?
Ah yes you are right, i missed the #else.
Thanks,
Zwane
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