linux-kernel - Re: [PATCH 3/7] sched: Use dl_bw

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Message-ID: <20140920185705.GU2832@worktop.localdomain>
Date:	Sat, 20 Sep 2014 20:57:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kirill Tkhai <tkhai@...dex.ru>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Kirill Tkhai <ktkhai@...allels.com>
Subject: Re: [PATCH 3/7] sched: Use dl_bw_of() under RCU read lock

On Sat, Sep 20, 2014 at 08:51:28PM +0400, Kirill Tkhai wrote:
> From: Kirill Tkhai <ktkhai@...allels.com>
> 
> dl_bw_of() dereferences rq->rd which has to have RCU read lock held.
> Probability of use-after-free and memory corruption aren't zero here.
> 

Additionally we might want to add something like:
lockdep_assert_held_rcu() and put that in dl_bw_of() and other such
places.
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