[PATCH RFC] rcu: RCU CPU stall patches backported to 2.6.33-rc8

[Paul E. McKenney]

Hello!

This set backports a couple of RCU CPU stall detection patches from the
earlier series (http://lkml.org/lkml/2010/2/22/384) to 2.6.33-rc8 to
help track down some NMI issues.

These two patches fix an embarrassing deadlock that can affect
TREE_PREEMPT_RCU and add additional per-task output when tasks stall the
RCU grace period.

 b/kernel/rcutree.c        |    2 +
 b/kernel/rcutree.h        |    1 
 b/kernel/rcutree_plugin.h |    4 ---
 b/lib/Kconfig.debug       |   13 ++++++++++-
 kernel/rcutree.c          |    4 +++
 kernel/rcutree_plugin.h   |   52 ++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 71 insertions(+), 5 deletions(-)
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