[PATCH tip/core/urgent 0/10] v2: Fix RCU lockdep splats

[Paul E. McKenney]

Hello!

This patchset contains ten fixes for various lockdep splats.  The first
two sets are repostings/revisions, the rest new.  The new patches have
all been posted to LKML, but this is the first time for inclusion.

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 new RCU-lockdep splats in cgroups and sched from
	Li Zefan.

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

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

o	vfs: fix RCU-lockdep false positive due to /proc access
	Fix for new RCU-lockdep splat from fdtable.h, with much
	debugging assist from Eric Dumazet.


 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/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 ++-
 kernel/cgroup.c                |    4 ++--
 12 files changed, 69 insertions(+), 21 deletions(-)
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