linux-kernel - Re: [PATCH] x86: make SMP locks handling interact properly with CONFIG_DEBUG

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Date:	Wed, 04 Jul 2007 11:09:04 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Dave Jones <davej@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jan Beulich <jbeulich@...ell.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org,
	patches@...-64.org
Subject: Re: [PATCH] x86: make SMP locks handling interact properly with	CONFIG_DEBUG_RODATA
 (2nd try)

Dave Jones wrote:
> On Wed, Jul 04, 2007 at 08:41:39AM -0700, Jeremy Fitzhardinge wrote:
>  
>  > I'd already posted a patch to remove smp alternatives.  I thought it had 
>  > been merged already, but I guess it's in Andi's queue.
>
> What was the rationale behind that?  Given many distros have now
> moved to shipping just an SMP kernel, this seems like a step backwards?
>   

No, there's two mechanisms.  There's the clobber the lock prefix thing, 
which is unaffected.  And there's smp_alternatives, which was a more 
ambitious mechanism to completely replace instructions in the SMP vs 
non-SMP cases, which is completely unused and therefore removed.

    J
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