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

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Message-ID: <20061207162050.A5009@jurassic.park.msu.ru>
Date:	Thu, 7 Dec 2006 16:20:50 +0300
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Russell King <rmk+lkml@....linux.org.uk>,
	Christoph Lameter <clameter@....com>,
	David Howells <dhowells@...hat.com>, torvalds@...l.org,
	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 Thu, Dec 07, 2006 at 08:31:08PM +1100, Nick Piggin wrote:
> It might be reasonable to implement this watered down version, but:
> don't some architectures have restrictions on what instructions can
> be issued between the ll and the sc?

Yes. On Alpha you cannot execute other load/stores, taken branches etc.
So in general case the code between ll and sc cannot be written in C...

Ivan.
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