rcu/tree: Add comments explaining now-offline-CPU QS reports
This a confusing piece of code (rightfully so as the issue it deals with
is complex). Recent discussions brought up a question -- what prevents the
rcu_implicit_dyntick_qs() from warning about QS reports for offline
CPUs.
QS reporting for now-offline CPUs should only happen from:
- gp_init()
- rcutree_cpu_report_dead()
Add some comments to this code explaining how QS reporting is not
missed when these functions are concurrently running.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
1 file changed
