linux-kernel - Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it

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Message-ID: <28668.1165434442@redhat.com>
Date:	Wed, 06 Dec 2006 19:47:22 +0000
From:	David Howells <dhowells@...hat.com>
To:	Lennert Buytenhek <buytenh@...tstofly.org>
Cc:	David Howells <dhowells@...hat.com>, torvalds@...l.org,
	akpm@...l.org, linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it 

Lennert Buytenhek <buytenh@...tstofly.org> wrote:

> > Pre-v6 ARM doesn't support SMP according to ARM's atomic.h,
> 
> That's not quite true, there exist ARMv5 processors that in theory
> can support SMP.

I meant that the Linux ARM arch doesn't support it:

	#else /* ARM_ARCH_6 */

	#include <asm/system.h>

	#ifdef CONFIG_SMP
	#error SMP not supported on pre-ARMv6 CPUs
	#endif

David
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