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

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Message-ID: <Pine.LNX.4.64.0612060918480.3542@woody.osdl.org>
Date:	Wed, 6 Dec 2006 09:21:00 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	David Howells <dhowells@...hat.com>
cc:	akpm@...l.org, linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch
 doesn't support it



On Wed, 6 Dec 2006, David Howells wrote:
> 
> Implement generic UP cmpxchg() where an arch doesn't otherwise support it.
> This assuming that the arch doesn't have support SMP without providing its own
> cmpxchg() implementation.

This is too ugly to live. At least the kernel/workqueue.c part.

The requirement that everybody implement a workable cmpxchg (and falling 
back to spinlocks if required as per the atomic bit operations) looks ok, 
but don't show that in generic code.

		Linus
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