RE: [PATCH 1/2] x86: add user_atomic_cmpxchg_inatomic at uaccess.h

[Ren, Qiaowei]

Qiaowei Ren wrote: 
> This patch adds user_atomic_cmpxchg_inatomic() to use CMPXCHG instruction
> against a user space address.
> 
> This generalizes the already existing futex_atomic_cmpxchg_inatomic() so it
> can be used in other contexts.  This will be used in the upcoming support for
> Intel MPX (Memory Protection Extensions.)
> 
Peter, do you have any other comments for this version?

Thanks,
Qiaowei
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