linux-kernel - Re: [GIT PULL rcu/urgent] Fixes for RCU regressions in 3.8

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Message-ID: <20130124122849.GC3104@gmail.com>
Date:	Thu, 24 Jan 2013 13:28:49 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	mingo@...e.hu, paul.gortmaker@...driver.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [GIT PULL rcu/urgent] Fixes for RCU regressions in 3.8


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> Hello, Ingo,
> 
> Paul Gortmaker found some problems with no-CBs-CPU support in 3.8
> mainline, and kindly supplied fixes.  The first problem is soft-lockup
> complaints that can occur on systems running with no-CBs CPUs that have
> long periods of time where RCU is completely idle, which can happen on
> some embedded systems.  The second problem is a documentation error
> for the "rcutree.rcu_nocb_poll" boot parameter.  In this case, Paul Gortmaker
> (rightly) noted that the need for "rcutree." was inconsistent with the
> "rcu_nocbs=<cpumap>" boot parameter.  The fix therefore to make the boot
> parameter named "rcu_nocb_poll".
> 
> These problems only affect kernels built with the new CONFIG_RCU_NOCB_CPU
> kernel parameter, but still should be fixed.
> 
> These fixes are available in the git repository at:
>   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/urgent
> 
> 							Thanx, Paul
> 
> ------------------>
> Paul Gortmaker (2):
>       rcu: Prevent soft-lockup complaints about no-CBs CPUs
>       rcu: Make rcu_nocb_poll an early_param instead of module_param
> 
>  Documentation/kernel-parameters.txt |    2 +-
>  kernel/rcutree_plugin.h             |   13 ++++++++++---
>  2 files changed, 11 insertions(+), 4 deletions(-)

Pulled, thanks a lot Paul!

	Ingo
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