linux-kernel - Re: [RFC PATCH] ARM: cmpxchg: define __HAVE_ARCH

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Date:	Thu, 31 May 2012 20:50:12 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Will Deacon <will.deacon@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Nicolas Pitre <nico@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH] ARM: cmpxchg: define __HAVE_ARCH_CMPXCHG for armv6
 and later

On Thu, May 31, 2012 at 02:24:50AM +0100, Will Deacon wrote:
> Hello,
> 
> On Wed, May 30, 2012 at 08:51:26AM +0100, Yong Zhang wrote:
> > diff --git a/arch/arm/include/asm/cmpxchg.h b/arch/arm/include/asm/cmpxchg.h
> > index 7eb18c1..a91b44e 100644
> > --- a/arch/arm/include/asm/cmpxchg.h
> > +++ b/arch/arm/include/asm/cmpxchg.h
> > @@ -127,6 +127,8 @@ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size
> >  
> >  #else	/* min ARCH >= ARMv6 */
> >  
> > +#define __HAVE_ARCH_CMPXCHG 1
> > +
> >  extern void __bad_cmpxchg(volatile void *ptr, int size);
> 
> As long as this only requires 4-byte cmpxchg support then I think this is
> fine. It looks like that's currently the case, so:

Yes and thanks for review.

Yong

> 
> Acked-by: Will Deacon <will.deacon@....com>
> 
> Will
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