[PATCH v2 tip/core/rcu 0/14] Miscellaneous fixes for 4.5

From: Paul E. McKenney
Date: Wed Dec 09 2015 - 18:09:48 EST


Hello!

This series contains miscellaneous fixes for 4.5:

1. Move lock_class_key to local scope within rcu_init_one().

2. Make rcu/tree_trace.c explicitly non-modular, courtesy of
Paul Gortmaker.

3. Save a line of code by streamlining rcu_sched_qs() control flow.

4. Remove lock-acquisition loop from rcu_read_unlock_special(),
but leave WARN_ON_ONCE().

5. Fix obsolete rcu_bootup_announce_oddness() comment.

6. Avoid tick_nohz_active checks on NOCBs CPUs, thus reducing
to/from-idle latency.

7. Stop disabling interrupts in scheduler fastpaths.

8. Eliminate unused rcu_init_one() "rda" argument.

9. Make cpu_needs_another_gp() be bool.

10. Don't redundantly disable irqs in rcu_irq_{enter,exit}(),
thus improving interrupt latency slightly.

11. Fix comment for rcu_dereference_raw_notrace(), courtesy of
Alexey Kardashevskiy.

12. Move wakeup out from under rnp->lock, courtesy of Peter Zijlstra.

13. Make rcu_gp_init() be bool.

14. Add lockless list traversal primitives, courtesy of
Alexey Kardashevskiy.

Changes since v1:

o Add commit 14, the lockless traversal primitives.

o Wire up to correct cover letter. :-/

Thanx, Paul

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

include/linux/rculist.h | 36 ++++++++++++
include/linux/rcupdate.h | 6 +-
include/linux/rcutiny.h | 8 ++
include/linux/rcutree.h | 4 +
include/linux/tracepoint.h | 4 -
kernel/rcu/tree.c | 128 ++++++++++++++++++++++++---------------------
kernel/rcu/tree_plugin.h | 44 +++++----------
kernel/rcu/tree_trace.c | 19 +-----
kernel/sched/core.c | 6 +-
9 files changed, 146 insertions(+), 109 deletions(-)

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