Re: [GIT PULL] scheduler fixes

[Eric Dumazet]

Ingo Molnar a écrit :
> 
> That's not enough - the inline assembly code in 
> arch/x86/include/asm/cmpxchg_32.h should also not reference 
> cmpxchg8b_emu in that case.
> 

I believe it is OK as is, since cmpxchg8b_emu is referenced only
once, in a section guarded by :
#ifndef CONFIG_X86_CMPXCHG64

(But I'll re-check in a couple of hours)

extract from arch/x86/include/asm/cmpxchg_32.h :


#ifndef CONFIG_X86_CMPXCHG64


#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))          \
                       : "memory");                             \
        __ret; })


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