[PATCH V4] powerpc: Implement {cmp}xchg for u8 and u16

[Boqun Feng]

On Wed, Apr 27, 2016 at 10:50:34PM +0800, Boqun Feng wrote:
> 
> Sorry, my bad, we can't implement cmpxchg like this.. please ignore
> this, I should really go to bed soon...
> 
> But still, we can save the "tmp" for xchg() I think.
> 

No.. we can't. Sorry for all the noise.

This patch looks good to me.

FWIW, you can add

Acked-by: Boqun Feng <boqun.feng at gmail.com>

Regards,
Boqun
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