linux-kernel - Re: [PATCH] sched_groups are expected to be circular linked list, make it so right after allocation

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Date:	Wed, 09 May 2012 13:52:10 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Igor Mammedov <imammedo@...hat.com>
Cc:	Jiang Liu <liuj97@...il.com>, linux-kernel@...r.kernel.org,
	mingo@...nel.org, pjt@...gle.com, tglx@...utronix.de,
	seto.hidetoshi@...fujitsu.com
Subject: Re: [PATCH] sched_groups are expected to be circular linked list,
 make it so right after allocation

On Wed, 2012-05-09 at 13:44 +0200, Igor Mammedov wrote:
> This patch fixes only build_sched_groups path, but there is another fail path
> that results in below OOPS.
> build_overlap_sched_groups() may exit without setting groups and later it will crash
> init_sched_groups_power as well.

if that allocation fails? Or is there another fail path?

>  But I just don't know how to fix it, so I've just
> posted partial fix that reduces crash frequency. 


> And I have to admit that
> cpu_active_mask and siblings map are busted but we either should not exit from builder
> funcs with NULL group or BUG there if it is impossible to come-up with sane group
> for insane domain span. 

I'm perfectly OK with taking the machine down, provided we can output
useful messages as to what is broken first..
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