Hello!
The following series improves RCU's handling of CPU hotplug. It also
contains a couple of ARM placeholder patches in case someone gets caught
out by tighter diagnostics.
1. Eliminate a HOTPLUG_CPU #ifdef in favor of IS_ENABLED()
2. Adjust rcu_read_unlock_special()'s acquisition of the
task's lock to start allowing for the fact that blocked
tasks are no longer migrated to the root rcu_node structure.
If the warning does not trigger, a later patch will eliminate
the loop.
3. Rmove dead code from force_qs_rnp().
4. Remove redundant offline check.
5. Correctly initialize ->rcu_qs_ctr_snap at online time to get the
code out of its current "working by accident" state.
6. Move smpboot_unpark_threads() handling into a notifier for
uniformity.
7. [Placeholder for ARM64] Use common code for ARM64 CPU-offline
notification.
8. [Placeholder for ARM] Use common code for ARM CPU-offline
notification.
9. Remove extraneous __cpuinit, courtesy of Paul Gortmaker.
Thanx, Paul
------------------------------------------------------------------------
b/arch/arm/kernel/smp.c | 6 +----
b/arch/arm64/kernel/smp.c | 6 +----
b/kernel/cpu.c | 4 +--
b/kernel/rcu/tree.c | 47 ++++++++++++++-------------------------------
b/kernel/rcu/tree_plugin.h | 9 +++++---
5 files changed, 27 insertions(+), 45 deletions(-)
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