context_tracking: Invoke Tasks-RCU enter/exit for NMI context
rcu_task_enter() and rcu_task_exit() are not called on NMI
entry and exit. So, Tasks-RCU-Rude grace period wait is required to
ensure that NMI handlers have entered/exited into Tasks-RCU eqs.
For architectures which do not require Tasks-RCU-Rude (as the code
sections where RCU is not watching are marked as noinstr), when
those architectures switch to not using Tasks-RCU-Rude, NMI handlers
task exit to eqs will need to be handled correctly for Tasks-RCU holdout
tasks running on nohz_full CPUs. As it is safe to call these two
functions from NMI context, remove the in_nmi() check to ensure that
Tasks-RCU entry/exit is marked correctly for NMI handlers.
Reported-by: Frederic Weisbecker <frederic@kernel.org>
Suggested-by: Frederic Weisbecker <frederic@kernel.org>
Suggested-by: "Paul E. McKenney" <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
1 file changed
