linux-kernel - Re: [PATCH] Alternative fix for kprobes&DEBUG_RODATA was Re: [1/2] 2.6.22-rc5: known regressions with patches

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Date:	Thu, 21 Jun 2007 09:03:36 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andi Kleen <ak@...e.de>
cc:	Dave Jones <davej@...hat.com>,
	Ian McDonald <ian.mcdonald@...di.co.nz>,
	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>,
	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: [PATCH] Alternative fix for kprobes&DEBUG_RODATA was Re: [1/2]
 2.6.22-rc5: known regressions with patches



On Thu, 21 Jun 2007, Andi Kleen wrote:

> Ok, here's a patch to do this. With that 55181000cd60334fe920c65ffbcdfe0e3f1de406
> should be reverted because it isn't needed anymore.

This seems buggy:

> +	int notext = 0;
>  
> +#ifdef CONFIG_KPROBES
> +	notext = 1;
> +#endif
>  #ifdef CONFIG_HOTPLUG_CPU
>  	/* It must still be possible to apply SMP alternatives. */
> -	if (num_possible_cpus() <= 1)
> +	notext = (num_possible_cpus() > 1);
>  #endif

The CONFIG_HOTPLUG_CPU case will overwrite the CONFIG_KPROBES, and turn it 
back to zero for a single CPU.

		Linus
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