On 2025-07-14 12:34, Paul E. McKenney wrote:
On Fri, Jul 11, 2025 at 10:05:26AM -0700, Paul E. McKenney wrote:
On Fri, Jul 11, 2025 at 09:46:25AM -0400, Mathieu Desnoyers wrote:
[ . . . ]
AFAIU the goal here is to turn the guard(preempt_notrace)() into a
guard(rcu_notrace)() because the preempt-off critical sections don't
agree with BPF.
OK, got it, thank you!
The combination of BPF and CONFIG_PREEMPT_RT certainly has provided at
least its share of entertainment, that is for sure. ;-)
Is there a similar issue with CONFIG_PREEMPT_LAZY, given that in that
case rcu_read_unlock() maps to preempt_enable(), which also can invoke
the scheduler?
I'll have to defer that question to someone who is more familiar than me
with the internals of CONFIG_PREEMPT_LAZY.
Thanks for your vote of confidence though! ;-)
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com
