v2 RCU fixes for 3.9

Hello!

The following fixes are intended for 3.9:

1. Fix int/long type confusion in trace_rcu_start_batch().
2. Declare rcu_is_cpu_rrupt_from_idle() static, courtesy of
Josh Triplett.
3. Make rcu_eqs_enter_common() trace the new nesting value instead
of zero, courtesy of Li Zhong.
4. Silence a gcc array-out-of-bounds false positive in rcu_init_one().
5. Code style fix in rcu_torture_barrier_init(), courtesy of Sasha Levin.
6. Grammar fix to rcu_scheduler_active comment, courtesy of Cody
Schafer.
7. Consolidate RCU's debugging Kconfig options, courtesy of Dave Hansen.
8. Remove unused context-tracker functions, courtesy of Li Zhong.
9. Remove obsolete Kconfig option from header comment.
10. Add comments to new context-tracking functions and internals,
courtesy of Frederic Weisbecker.

Changes since v1:

o Added #7-#10.

Thanx, Paul

 b/include/linux/rcupdate.h   |    2 
 b/include/trace/events/rcu.h |    6 +-
 b/kernel/context_tracking.c  |   75 ++++++++++++++++++++++++----
 b/kernel/rcutiny.c           |    2 
 b/kernel/rcutorture.c        |    2 
 b/kernel/rcutree.c           |   13 ++--
 b/kernel/rcutree.h           |    4 -
 b/lib/Kconfig.debug          |  114 ++++++++++++++++++++++---------------------
 8 files changed, 137 insertions(+), 81 deletions(-)