Re: [PATCH V4] powerpc: Implement {cmp}xchg for u8 and u16
From: Peter Zijlstra
Date: Thu Apr 28 2016 - 03:59:26 EST
On Wed, Apr 27, 2016 at 05:16:45PM +0800, Pan Xinhui wrote:
> From: Pan Xinhui <xinhui.pan@xxxxxxxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxx>
> Signed-off-by: Pan Xinhui <xinhui.pan@xxxxxxxxxxxxxxxxxx>
Generally has the right shape; and I trust others to double check the
ppc-asm minutia.
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>