linux-kernel - Re: RCU recursion? (code inspection)

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Message-ID: <20150501194102.GH5381@linux.vnet.ibm.com>
Date:	Fri, 1 May 2015 12:41:02 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Linux kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: RCU recursion? (code inspection)

On Fri, May 01, 2015 at 03:18:28PM -0400, Rik van Riel wrote:
> Hi Paul,
> 
> While looking at synchronize_rcu(), I noticed that
> synchronize_rcu_expedited() calls synchronize_sched_expedited(),
> which can call synchronize_sched() when it is worried about
> the counter wrapping, which can call synchronize_sched_expedited()
> 
> The code is sufficiently convoluted that I am unsure whether this
> recursion can actually happen in practice, but I also did not spot
> anything that would stop it.

Hmmm...  Sounds like I should take a look!

							Thanx, Paul

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