Messages in this thread | | | Date | Thu, 01 Oct 2009 08:18:37 +0200 | From | Eric Dumazet <> | Subject | Re: [GIT PULL] scheduler fixes |
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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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