sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any

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Currently the user can set up isolcpus and nohz_full in such a way that
leaves no housekeeping CPU (i.e. no CPU that is neither domain isolated
nor nohz full). This can be a problem for other subsystems (e.g. the
timer wheel imgration).

Prevent this configuration by invalidating the last setting in case the
union of isolcpus (domain) and nohz_full covers all CPUs.

Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Waiman Long <longman@redhat.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://patch.msgid.link/20251120145653.296659-6-gmonaco@redhat.com

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Gabriele Monaco 2025-11-20 15:56:51 +01:00 • committed by Thomas Gleixner

parent 22f8e41680

commit 185bccc797

1 changed files with 23 additions and 0 deletions

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kernel/sched/isolation.c

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