linux-kernel - Re: [tip:core/rcu] rcu: Make task_subsys_state() RCU-lockdep checks handle boot-time use

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Message-ID: <6599ad831003011147y41a34db4o2a5e78961b0be87b@mail.gmail.com>
Date:	Mon, 1 Mar 2010 11:47:22 -0800
From:	Paul Menage <menage@...gle.com>
To:	mingo@...hat.com, hpa@...or.com, paulmck@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/rcu] rcu: Make task_subsys_state() RCU-lockdep checks 
	handle boot-time use

On Sun, Feb 28, 2010 at 12:59 AM, tip-bot for Paul E. McKenney
<paulmck@...ux.vnet.ibm.com> wrote:
> Commit-ID:  1883c79a57a5fe25309007590cccb1b2782c41b2
> Gitweb:     http://git.kernel.org/tip/1883c79a57a5fe25309007590cccb1b2782c41b2
> Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> AuthorDate: Sat, 27 Feb 2010 14:53:08 -0800
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Sun, 28 Feb 2010 09:17:42 +0100
>
> rcu: Make task_subsys_state() RCU-lockdep checks handle boot-time use
>
> It is apparently legal to invoke task_subsys_state() without RCU
> protection during early boot time.  After all, there are no
> concurrent tasks, so there can be no grace periods completing
> concurrently.
>
> But this does need an Acked-by from the cgroups folks.
>
> Located-by: Ingo Molnar <mingo@...e.hu>
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Acked-by: Paul Menage <menage@...gle.com>

Thanks.

Paul
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