linux-kernel - Re: [PATCH tip/core/rcu 38/55] rcu: Prohibit grace periods during early boot

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Message-ID: <20111017015101.GF19421@leaf>
Date:	Sun, 16 Oct 2011 18:51:02 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org, "Paul E. McKenney" <paul.mckenney@...aro.org>
Subject: Re: [PATCH tip/core/rcu 38/55] rcu: Prohibit grace periods during
 early boot

On Tue, Sep 06, 2011 at 11:00:32AM -0700, Paul E. McKenney wrote:
> From: Paul E. McKenney <paul.mckenney@...aro.org>
> 
> Greater use of RCU during early boot (before the scheduler is operating)
> is causing RCU to attempt to start grace periods during that time, which
> in turn is resulting in both RCU and the callback functions attempting
> to use the scheduler before it is ready.
> 
> This commit prevents these problems by prohibiting RCU grace periods
> until after the scheduler has spawned the first non-idle task.

As with patch 36, this seems like a good candidate for jump labels.

- Josh Triplett
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