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

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Message-ID: <20150203163435.GT19109@linux.vnet.ibm.com>
Date:	Tue, 3 Feb 2015 08:34:35 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	David Hildenbrand <dahi@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...nel.org>, 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

On Tue, Feb 03, 2015 at 03:34:45PM +0100, David Hildenbrand wrote:
> > 
> > * 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.

Good point, though appropriate RCU changes seem to make their way to -stable
without explicit CCs.  Maybe I should be doing them, but doing so in the
past has normally gotten me complaints from the -stable maintainers.

Ingo, how would you like me to be handling this in the future?

							Thanx, Paul

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