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

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Message-ID: <20120531012450.GA8506@mudshark.cambridge.arm.com>
Date:	Thu, 31 May 2012 02:24:50 +0100
From:	Will Deacon <will.deacon@....com>
To:	Yong Zhang <yong.zhang0@...il.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

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:

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

Will
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