linux-kernel - Re: [GIT PULL rcu/next] RCU commits for 3.20

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Date:	Tue, 3 Feb 2015 15:34:45 +0100
From:	David Hildenbrand <dahi@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [GIT PULL rcu/next] RCU commits for 3.20

> 
> * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > Hello, Ingo,
> > 
> > The changes in this series include:
> > 
> > 1.	Documentation updates.  These were posted to LKML at
> > 	https://lkml.org/lkml/2015/1/7/496.
> > 
> > 2.	Miscellaneous fixes.  These were posted to LKML at
> > 	https://lkml.org/lkml/2015/1/7/507.
> > 
> > 3.	Preemptible-RCU fixes, including fixing an old bug in the
> > 	interaction of RCU priority boosting and CPU hotplug.  These were
> > 	posted to LKML at https://lkml.org/lkml/2015/1/7/535.
> > 
> > 4.	SRCU updates.  These were posted to LKML at
> > 	https://lkml.org/lkml/2015/1/7/555.
> > 
> > 5.	RCU CPU stall-warning updates.  These were posted to LKML at
> > 	https://lkml.org/lkml/2015/1/7/565.
> > 
> > 6.	RCU torture-test updates.  These were posted to LKML at
> > 	https://lkml.org/lkml/2015/1/7/591.
> > 
> > These changes are available in the git repository at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for-mingo
> > 
> > for you to fetch changes up to 78e691f4ae2d5edea0199ca802bb505b9cdced88:
> > 
> >   Merge branches 'doc.2015.01.07a', 'fixes.2015.01.15a', 'preempt.2015.01.06a', 'srcu.2015.01.06a', 'stall.2015.01.16a' and 'torture.2015.01.11a' into HEAD (2015-01-15 23:34:34 -0800)
> > 
> > ----------------------------------------------------------------
> > 
> > Alexander Gordeev (1):
> >       rcu: Remove redundant rcu_is_cpu_rrupt_from_idle() from tiny RCU
> > 
> > Calvin Owens (1):
> >       ksoftirqd: Enable IRQs and call cond_resched() before poking RCU
> > 
> > David Hildenbrand (1):
> >       hotplugcpu: Avoid deadlocks by waking active_writer
> > 

Hi Ingo, Paul,

Heiko/Christian seem to have hit the bug (hotplugcpu: Avoid deadlocks by waking
active_writer addresses) in 3.18-rc3.

And as commit b2c4623dcd07 was in linux starting with 3.18-rc3, we should
probably (have done a) cc-stable.

David

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