linux-kernel - Re: [1/2] 2.6.22-rc5: known regressions with patches

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Message-ID: <alpine.LFD.0.98.0706201536161.3593@woody.linux-foundation.org>
Date:	Wed, 20 Jun 2007 15:38:06 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ian McDonald <ian.mcdonald@...di.co.nz>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	Ingo Molnar <mingo@...e.hu>,
	"Darrick J. Wong" <djwong@...ibm.com>, Andi Kleen <ak@...e.de>,
	Bj?rn Steinbrink <B.Steinbrink@....de>,
	William Cohen <wcohen@...hat.com>,
	"S. P. Prasanna" <prasanna@...ibm.com>,
	Antonino Daplas <adaplas@...il.com>,
	Olaf Hering <olaf@...fle.de>, Ville Syrj?l? <syrjala@....fi>,
	Jean Delvare <khali@...ux-fr.org>,
	Rudolf Marek <r.marek@...embler.cz>,
	Soeren Sonnenburg <kernel@....de>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Subject: Re: [1/2] 2.6.22-rc5: known regressions with patches



On Thu, 21 Jun 2007, Ian McDonald wrote:
> 
> Can this one be merged so that it makes it into 2.6.22?
> 
> > 
> > Subject    : CONFIG_DEBUG_RODATA prevents kprobes from working on 2.6.22-rc2
> > References : http://lkml.org/lkml/2007/5/23/202
> > Submitter  : William Cohen <wcohen@...hat.com>
> >              Ian McDonald <ian.mcdonald@...di.co.nz>
> > Handled-By : S. P. Prasanna <prasanna@...ibm.com>
> > Patch      : http://lkml.org/lkml/2007/6/7/2
> > Status     : patch available
> > 
> 
> Regards,

Well, for 2.6.22, Kprobes will just be disabled if you use DEBUG_RODATA.

And yes, that patch already got merged. However, the patch to *allow* 
Kprobes with DEBUG_RODATA is not, and will not be. It's not a regression, 
and quite frankly, I don't think I would even want that patch.

Kprobes fundamntally disagrees with DEBUG_RODATA, there's no point in 
"working around it". Better just admit it.

		Linus
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