Quick review of RCU-related patches in v5.10.8-rt23

From: Paul E. McKenney
Date: Thu Jan 28 2021 - 15:04:53 EST


Hello, Sebastian,

Just doing my periodic (but decidedly non-real-time) scan of RCU-related
patches in -rt, in this case v5.10.8-rt23:

db93e2f1b4b0 ("rcu: Prevent false positive softirq warning on RT")
Looks ready for mainline, given CONFIG_PREEMPT_RT.
f3541b467fbb ("sched: Do not account rcu_preempt_depth on RT in might_sleep()")
If the scheduler maintainers are OK with their part of this patch,
looks good to me, given CONFIG_PREEMPT_RT. Feel free to add:
Acked-by: Paul E. McKenney <paulmck@xxxxxxxxxxx>
d8c5a7d75e08 ("rcutorture: Avoid problematic critical section nesting on RT")
This one I need to understand better. I do like the use of local
variables to make the "if" conditions less unruly.

The rest are in -rcu already:

a163ef8687a1 ("rcu: make RCU_BOOST default on RT")
Commit 2341bc4a0311 in -rcu. In yesterday's pull request.
5ffd75a96828 ("rcu: Use rcuc threads on PREEMPT_RT as we did")
Commit 8b9a0ecc7ef5 in -rcu. In yesterday's pull request.
e0b671bca2e7 ("rcu: enable rcu_normal_after_boot by default for RT")
Commit 36221e109eb2 in -rcu. In yesterday's pull request.
e27ef68731a1 ("rcu: Don't invoke try_invoke_on_locked_down_task() with irqs disabled")
This one is in v5.10 mainline.

Any reason I shouldn't pull in db93e2f1b4b0 ("rcu: Prevent false positive
softirq warning on RT") for v5.13?

Thanx, Paul