On Tue, 13 Jul 2010, Avi Kivity wrote:

quoted text
> Well, current upstream uses "m":
>
>>         case 8:                                                         \
>>                 asm volatile(lock "cmpxchgq %1,%2"                      \
>>                              : "=a"(__ret)                              \
>>                              : "r"(__new), "m"(*__xg(ptr)), "0"(__old)  \
>>                              : "memory");                               \
>>                 break;                                                  \
>
> and works; I also failed to reproduce with 2.6.32.16.  So I expect some  
> toolchain involvement.
>
> Peter, what gcc are you using?

gcc (Debian 4.3.2-1.1) 4.3.2

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