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

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Date:	Wed, 9 Dec 2015 15:09:40 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com,
	bobby.prani@...il.com
Subject: [PATCH v2 tip/core/rcu 0/14] Miscellaneous fixes for 4.5

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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