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

["Paul E. McKenney" <paulmck@linux.vnet.ibm.com>]

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(-)