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

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Message-ID: <CA+5PVA7q03ZTLtFZH98KvtLbreSx65uGEBJmT02-vCHgogHaMg@mail.gmail.com>
Date:	Wed, 7 Mar 2012 10:49:26 -0500
From:	Josh Boyer <jwboyer@...il.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, Andre@...per.es
Subject: Re: [GIT PULL] RCU changes for v3.3

On Wed, Mar 7, 2012 at 10:27 AM, Paul E. McKenney
<paulmck@...ux.vnet.ibm.com> wrote:
> On Wed, Mar 07, 2012 at 09:09:39AM -0500, Josh Boyer wrote:
>> On Wed, Mar 7, 2012 at 6:44 AM, Sergey Senozhatsky
>> <sergey.senozhatsky@...il.com> wrote:
>> > Hello,
>> > I just hit the same problem.
>> >
>> > Is this patch scheduled for 3.3 until release or will land during 3.4
>> > merge window?
>>
>> There are 3 patches in Paul's 3.4 queue, and another 9 of Steven Rostedt's
>> that fix this.  They'll wind up in 3.4.
>>
>> I looked at reverting the patch that adds this new warning and it doesn't
>> trivially revert.
>
> What are you based on?  I should be able to disable the warning for
> you easily enough.

3.3.  I think I tried reverting 00f49e5729af602deb559b0cf293a00b625e8636 and
it failed.  Then I locally commented out the WARN_ONCE in the functions which
got rid of that, but we still get a 'suspicious RCU usage' warning when
running powertop.  I gave up after that, since it all goes away if we disable
the debugging options and you have fixes queued for 3.4.

josh
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