linux-kernel - RCU recursion? (code inspection)

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Message-ID: <5543D184.4070707@redhat.com>
Date:	Fri, 01 May 2015 15:18:28 -0400
From:	Rik van Riel <riel@...hat.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RCU recursion? (code inspection)

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.

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