linux-kernel - Re: [PATCH V4] powerpc: Implement {cmp}xchg for u8 and u16

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Date:	Thu, 28 Apr 2016 09:59:13 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Pan Xinhui <xinhui@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
	boqun.feng@...il.com, paulmck@...ux.vnet.ibm.com,
	tglx@...utronix.de
Subject: Re: [PATCH V4] powerpc: Implement {cmp}xchg for u8 and u16

On Wed, Apr 27, 2016 at 05:16:45PM +0800, Pan Xinhui wrote:
> From: Pan Xinhui <xinhui.pan@...ux.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@...radead.org>
> Signed-off-by: Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>

Generally has the right shape; and I trust others to double check the
ppc-asm minutia.

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>