linux-kernel - [PATCH tip/core/rcu 0/17] v2 Fixups for 3.6

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Date:	Fri, 22 Jun 2012 08:35:01 -0700
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@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu, patches@...aro.org
Subject: [PATCH tip/core/rcu 0/17] v2 Fixups for 3.6

Hello!

This patch series has general fixups and improvements.  This is version 2,
the prior version may be found at: https://lkml.org/lkml/2012/6/15/388.
The individual patches are as follows:

1.	Get rid of the false positives from the code that recognizes
	a CPU stall that ends just as it is detected.
2.	Consolidate open-coded initializations of RCU callback lists.
3.	Protect unsynchronized accesses to ->qlen with ACCESS_ONCE()
	to document the unsynchronized access and to prevent compiler
	mischief.
4.	Add RCU_POINTER_INITIALIZER() for static initialization to allow
	do-while formulation of the existing RCU_INIT_POINTER().
5.	Convert clever use of RCU_INIT_POINTER() for gcc-style
	initialization to RCU_POINTER_INITIALIZER().
6.	Wrap RCU_INIT_POINTER() macro in obligatory do-while.
7.	Remove extraneous parentheses from rcu_assign_keypointer()
	to allow rcu_assign_pointer() to be wrapped in do-while.
8.	Wrap rcu_assign_pointer() macro in obligatory do-while.
9.	Consolidate the identical CONFIG_TREE_PREEMPT_RCU and
	CONFIG_TINY_PREEMPT_RCU versions of __rcu_read_lock() and
	__rcu_read_unlock().
10.	Remove the old inline-function version of __kfree_rcu() and
	__is_kfree_rcu_offset().
11.	Make __call_rcu() correctly handle calls from the idle loop.
12.	Make __call_rcu() correctly handle calls from a CPU that is
	in the process of going offline.
13.	Split __call_rcu() into the part that actually deals with
	enqueueing the callback and the part that kicks RCU's
	grace-period machinery.
14.	Make RCU_TINY's rcu_is_cpu_idle() function safe for "make
	randconfig".
15.	Properly initialize the preemptible-RCU string in kernels built
	without CONFIG_RCU_FAST_NO_HZ (courtesy of Carsten Emde).
16.	Disable preemption in rcu_blocking_is_gp() to allow future
	optimization of preemptible-RCU synchronize_rcu() for single-CPU
	systems.
17.	Add a warning for CPUs going offline with RCU callbacks queued.

Changes since version 1:

o	Applied Josh Triplett review comments.
o	Added patches 15-17.

							Thanx, Paul

 b/include/linux/init_task.h |    4 -
 b/include/linux/key.h       |    2 
 b/include/linux/rcupdate.h  |    8 ++
 b/kernel/rcupdate.c         |   44 +++++++++++
 b/kernel/rcutiny.c          |    4 -
 b/kernel/rcutiny_plugin.h   |   47 ------------
 b/kernel/rcutree.c          |    4 -
 b/kernel/rcutree_plugin.h   |   47 ------------
 include/linux/rcupdate.h    |   42 ++---------
 kernel/rcutree.c            |  164 ++++++++++++++++++++++----------------------
 kernel/rcutree_plugin.h     |    1 
 11 files changed, 157 insertions(+), 210 deletions(-)

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