linux-kernel - [PATCH tip/core/rcu 0/3] rcu: fixes for lockdep RCU and accelerated dyntick GPs

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Date:	Fri, 26 Feb 2010 16:38:31 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com
Subject: [PATCH tip/core/rcu 0/3] rcu: fixes for lockdep RCU and
	accelerated dyntick GPs

Hello!

This patchset includes three fixes for problems in tip/core/rcu:

1.	Convert grace-period acceleration for the last non-dynticked
	RCU to a trivial state machine in order to avoid illegally
	invoking __rcu_process_callbacks() with irqs disabled.

2.	Make the non-PROVE_RCU variant of rcu_read_lock_sched_held()
	understand that preemption is disabled during boot before
	the scheduler starts.  (The earlier patch did the PROVE_RCU
	variant, but missed the non-PROVE_RCU variant.)

3.	Add some irq-disabling to the grace-period acceleration
	in #1 above and also enforce a hold-off period so that the
	last non-dynticked CPU doesn't softirq itself to death when
	there are multiple RCU callbacks in flight.

							Thanx, Paul

 b/include/linux/rcupdate.h |    3 -
 b/kernel/rcutree.c         |    3 +
 b/kernel/rcutree.h         |    1 
 b/kernel/rcutree_plugin.h  |   74 ++++++++++++++++++++++++++++++++-------------
 kernel/rcutree_plugin.h    |   11 +++++-
 5 files changed, 67 insertions(+), 25 deletions(-)
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