Miscellaneous fixes for 4.6

Hello!

This series contains miscellaneous fixes for 4.6:

1. rcu: Assign false instead of 0 for ->core_needs_qs

2. Update rcu_report_qs_rsp() comment for RCU's grace-period kthreads.

3. Stop treating in-kernel CPU-bound workloads as errors, and stop
IPIing such CPUs unless it is necessary. (If the loop contains cond_resched_rcu_qs(), then it is not necessary!)

4. Set rdp->gpwrap when CPU is idle instead of doing it backwards.

5. Correct no-expedite console messages.

6. Remove useless rcu_data_p when !PREEMPT_RCU, courtesy of Chen Gang.

7-9. Allow fields to be marked private to allow sparse to complain
about unauthorized access for rcu_node:: lock and irq_common_data::state_use_accessors, courtesy of Boqun Feng.

10. Make rcu/tiny_plugin.h explicitly non-modular, courtesy of
Paul Gortmaker.

11. Document unique-name limitation for DEFINE_STATIC_SRCU(),
which results from the same per-CPU variable limitation.

12. Catch up rcu_report_qs_rdp() comment with reality.

13. Remove rcu_user_hooks_switch, courtesy of Yang Shi.

Thanx, Paul

------------------------------------------------------------------------

 include/linux/compiler.h |   12 ++-
 include/linux/irq.h      |    6 +
 include/linux/rcupdate.h |    2 
 include/linux/srcu.h     |   19 +++++-
 kernel/irq/internals.h   |    4 +
 kernel/rcu/rcutorture.c  |   14 ++--
 kernel/rcu/tiny_plugin.h |   15 ----
 kernel/rcu/tree.c        |  143 +++++++++++++++++++++++------------------------
 kernel/rcu/tree.h        |   42 ++++++++++---
 kernel/rcu/tree_plugin.h |   27 ++++----
 scripts/checkpatch.pl    |    3 
 11 files changed, 159 insertions(+), 128 deletions(-)