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

[Michael Ellerman]

On Wed, 2016-04-27 at 09:16:45 UTC, xinhui wrote:
> From: Pan Xinhui <xinhui.pan at linux.vnet.ibm.com>
> 
> Implement xchg{u8,u16}{local,relaxed}, and
> cmpxchg{u8,u16}{,local,acquire,relaxed}.
> 
> It works on all ppc.
> 
> remove volatile of first parameter in __cmpxchg_local and __cmpxchg
> 
> Suggested-by: Peter Zijlstra (Intel) <peterz at infradead.org>
> Signed-off-by: Pan Xinhui <xinhui.pan at linux.vnet.ibm.com>
> Acked-by: Boqun Feng <boqun.feng at gmail.com>
> Acked-by: Peter Zijlstra (Intel) <peterz at infradead.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/d0563a1297e234ed37f6b51c2e9321

cheers