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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