linux-kernel - Re: [GIT PULL] RCU changes for v3.3

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Date:	Wed, 25 Jan 2012 11:59:06 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] RCU changes for v3.3

On Tue, Jan 24, 2012 at 05:36:04PM -0800, Paul E. McKenney wrote:
> On Tue, Jan 24, 2012 at 11:51:24PM +0000, Mark Brown wrote:

> > Well, that depends.  Anything you're actually accomplishing when you're
> > optimising at that level is at the less than a milliwatt level.

> OK, good point.

> In the meantime, here are some alleged fixes for the corresponding bug in
> the ARM tree.  Some of these are "interesting" in the sense that RCU can
> be used more deeply in the idle loop than I would believe to be safe,
> for example, via locking->lockdep->RCU after some interesting pieces
> of hardware have been shut off.  I took my best guess and commented the
> ones that I am least sure of.

> Thoughts?  Other than I need to CC a cast of thousands?  (I cannot break
> this up without having git bisect points with busted RCU on ARM.)

Not really - I don't know ARM CPU side stuff in any detail, I mostly
work on things external to the SoCs.

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