linux-kernel - Re: [PATCH] Fix array overflow in CFQ

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Message-ID: <4CBD9BCA.2060200@linux.intel.com>
Date:	Tue, 19 Oct 2010 15:23:22 +0200
From:	Andi Kleen <ak@...ux.intel.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	Jens Axboe <axboe@...nel.dk>, Andi Kleen <andi@...stfloor.org>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix array overflow in CFQ


>          slice = group_slice * count /
>                  max_t(unsigned, cfqg->busy_queues_avg[cfqd->serving_prio],
>                        cfq_group_busy_queues_wl(cfqd->serving_prio, cfqd,
> cfqg));
>
> So for IDLE class, we return immediately from the function and never
> execute cfqg->busy_queues_avg[IDLE].

Hmm that's true. But why do you put this into a global variable anyways, 
can't it
just be a local?
> Now to remove the gcc warning we can increase the size of busy_queues_avg[]
> array but third field should always remain unused.
>
It's better to increase the field still I think.

-Andi

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