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

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Message-ID: <Pine.LNX.4.64.0612081136230.3516@woody.osdl.org>
Date:	Fri, 8 Dec 2006 11:37:45 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Russell King <rmk+lkml@....linux.org.uk>
cc:	Christoph Lameter <clameter@....com>,
	David Howells <dhowells@...hat.com>,
	Nick Piggin <nickpiggin@...oo.com.au>, 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 Fri, 8 Dec 2006, Russell King wrote:
> 
> I utterly disagree.  I could code atomic_add() as:

Sure. And Alpha could do that too. If you write the C code a specific way, 
you can make it work. That does NOT mean that you can expose it widely as 
a portable interface - it's still just a very _nonportable_ interface that 
you use internally within one architecture to implement other interfaces.

			Linus
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