Re: [Xen-devel] [PATCH v6 02/18] Add cmpxchg16b support for x86-64

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.09.15 at 09:37, <feng.wu@xxxxxxxxx> wrote:
> Thanks for your suggestion. How about this?
> 
> #define cmpxchg16b(ptr,o,n)                                            \
>     ( ({ ASSERT(((unsigned long)ptr & 0xF) == 0); }),                  \
>       BUILD_BUG_ON(sizeof(*o) != sizeof(__uint128_t)),                 \
>       BUILD_BUG_ON(sizeof(*n) != sizeof(__uint128_t)),                 \
>       __cmpxchg16b((ptr), (__uint128_t *)(o), (__uint128_t *)(n)) )

Yes (properly parenthesized and the ({ }) either removed or extended
to the whole expression).

Jan


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