Hello!
This series, probably for v3.21, contains changes that allow RCU callbacks
to be posted at very early boot, as in before rcu_init() is called.
This was requested by the tracing folks. This series applies against
tip/core/rcu, and probably not against current mainline.
The patches in this series are as follows:
1. Abstract initialization of callback lists.
2. Wire up the rcu_state structures' ->rda pointers at compile time.
3. Prevent early boot callbacks from splatting.
4. Refine diagnostics for lacking an rcuo kthread for no-CBs
CPUs that have callbacks posted.
5. Avoid clobbering lists of early boot callbacks.
6. Move early boot callbacks as needed by no-CBs CPUs.
7. Move early boot callbacks tests to beginning of rcu_init().
This passes modest rcutorture testing, but is probably missing a corner
case or two.
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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