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

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Date:	Thu, 28 Apr 2016 18:21:43 +0800
From:	Pan Xinhui <xinhui@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 2016年04月28日 15:59, Peter Zijlstra wrote:
> 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>
> 
> 
thanks!