linux-kernel - [PATCH tip/core/rcu 0/7] Early-boot RCU callbacks for v4.1

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Date:	Tue, 3 Mar 2015 08:45:28 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, laijs@...fujitsu.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 tip/core/rcu 0/7] Early-boot RCU callbacks for v4.1

Hello!

This series allows RCU callbacks to be posted very early at boot time,
even before rcu_init() is called.

1.	Abstract initialization of the default (non-no-CB) callbacks list
	from the init_callback_list() function into a new
	init_default_callback_list() function.

2.	Initialize rcu_state structures' ->rda pointers to per-CPU
	rcu_data structures at compile time, so that this linkage
	is established for early-boot usage.

3.	Remove diagnostics that currently splat in the presence of
	early-boot RCU callbacks.

4.	Update no-CBs diagnostics to allow for early-boot RCU callbacks.

5.	Make RCU's CPU-hotplug online code avoid initializing non-empty
	RCU callback lists in order to avoid leaking early-boot callbacks.

6.	When a given CPU is determined to be a no-CBs CPU, move any
	early-boot callbacks to its no-CBs callback list.

7.	Move the early-boot callback tests to precede rcu_init()'s
	initialization code, the better to test all the above.

							Thanx, Paul

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

 b/kernel/rcu/tree.c        |   52 ++++++++++++++++++++++++++++++++-------------
 b/kernel/rcu/tree_plugin.h |   27 ++++++++++++-----------
 2 files changed, 51 insertions(+), 28 deletions(-)

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