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

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Date:	Wed, 04 Jul 2007 17:29:54 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"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)

>>> Jeremy Fitzhardinge <jeremy@...p.org> 04.07.07 17:41 >>>
>Jan Beulich wrote:
>> Instead of suppressing the change of .text to become readonly, make
>> the SMP locks patching code properly adjust/restore the page access
>> rights.
>>   
>
>I guess we'll need to do the same thing for paravirt_ops patching?

No, the patch already does this (as long as there no code to do that other
than in alternatives.c).

>> On x86-64 additionally remove all mappings past the kernel image, and
>> remove leftovers from the removal of the more general (but abandoned)
>> SMP alternatives.
>>   
>
>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.

Oh, sorry, I forgot to remove that part of the comment after merging up to
2.6..22-rcX.

Jan

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