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

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Date:	Fri, 12 Oct 2012 09:53:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, fweisbec@...il.com,
	kirill@...temov.name
Subject: Re: [GIT PULL rcu/urgent] Fixes for RCU regressions


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

> Hello, Ingo,
> 
> This series fixes some RCU regressions in 3.7.
> 
> Kirill A. Shutemov found a case where synchronize_rcu() is invoked
> from a CPU-hotplug notifier, which, with RCU's shiny new kthread-based
> grace-period implementation, results in deadlock.  The first commit
> in this series fixes this deadlock by introducing RCU-specific
> synchronization, so that RCU grace periods exclude only RCU's CPU-hotplug
> notifiers, not the entire CPU-hotplug operation.  Kirill successfully
> tested this commit (as have I), and it has furthermore been exposed to
> -next testing.
> 
> The other commit in this series adds a warning to the new RCU_USER_QS
> and RCU_USER_QS_FORCE Kconfig options, noting that these features,
> though reasonably stable, are probably not ready for millions of users.
> This commit affects only the Kconfig help text.
> 
> These changes are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/urgent
> 
> 							Thanx, Paul
> 
> ------------------>
> Frederic Weisbecker (1):
>       rcu: Advise most users not to enable RCU user mode
> 
> Paul E. McKenney (1):
>       rcu: Grace-period initialization excludes only RCU notifier
> 
>  init/Kconfig     |   12 ++++++++++++
>  kernel/rcutree.c |   21 ++++++++++-----------
>  kernel/rcutree.h |    6 ++++++
>  3 files changed, 28 insertions(+), 11 deletions(-)

Pulled, thanks a lot Paul!

	Ingo
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