linux-kernel - [PATCH tip/core/urgent 0/10] v3: Fix RCU lockdep splats

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Date:	Mon, 3 May 2010 11:52:53 -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@...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,
	eric.dumazet@...il.com
Subject: [PATCH tip/core/urgent 0/10] v3: Fix RCU lockdep splats

Hello!

This patchset reposts ten fixes for various lockdep splats.  The only
changes from v2 (http://lkml.org/lkml/2010/4/30/500) is the addition of
relevant maintainers on CC and fixing the last patch to work correctly
from modules.  (Of course, if you would rather take the patch up your
tree, please let me know.)

							Thanx, Paul

o	rcu: v2: optionally leave lockdep enabled after RCU lockdep splat
	This is a repost that makes the one-splat-per-boot the default,
	but allows those who want multiple splats to get this behavior
	via a new CONFIG_PROVE_RCU_REPEATEDLY configuration parameter.
	(Original from Lai Jiangshan.)

o	KEYS: Fix an RCU warning
	KEYS: Fix an RCU warning in the reading of user keys
	Fixes for RCU-lockdep splats from David Howells for
	security/keys.  Repost of http://lkml.org/lkml/2010/4/22/411.

o	cgroup: Fix an RCU warning in cgroup_path()
	cgroup: Fix an RCU warning in alloc_css_id()
	sched: Fix an RCU warning in print_task()
	cgroup: Check task_lock in task_subsys_state()
	Fixes for RCU-lockdep splats in cgroups and sched from
	Li Zefan.

o	memcg: css_id() must be called under rcu_read_lock()
	Fixes for RCU-lockdep splats in memcg from Kamazawa Hiroyuki.

o	blk-cgroup: Fix RCU correctness warning in cfq_init_queue()
	Fix for RCU-lockdep splat in I/O scheduler from Vivek Goyal.

o	vfs: fix RCU-lockdep false positive due to /proc access
	Fix for RCU-lockdep splat from fdtable.h, with much
	debugging assist from Eric Dumazet.  Updated to provide a
	wrapper function for thread_group_empty() to continue to allow
	this to be callable from a module.

 b/block/cfq-iosched.c          |    2 ++
 b/include/linux/cgroup.h       |    1 +
 b/include/linux/fdtable.h      |    3 ++-
 b/include/linux/rcupdate.h     |   15 +++++++++++----
 b/kernel/cgroup.c              |   12 +++++++++---
 b/kernel/lockdep.c             |    2 ++
 b/kernel/rcupdate.c            |   11 +++++++++++
 b/kernel/sched_debug.c         |    2 ++
 b/lib/Kconfig.debug            |   12 ++++++++++++
 b/mm/memcontrol.c              |   21 ++++++++++++++++-----
 b/security/keys/request_key.c  |   13 ++++++++-----
 b/security/keys/user_defined.c |    3 ++-
 include/linux/rcupdate.h       |    2 ++
 kernel/cgroup.c                |    4 ++--
 14 files changed, 82 insertions(+), 21 deletions(-)
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