rcu: Introduce rcu_cpu_online()

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Export the RCU point of view as to when a CPU is considered offline
(ie: when does RCU consider that a CPU is sufficiently down in the
hotplug process to not feature any possible read side).

This will be used by RCU-tasks whose vision of an offline CPU should
reasonably match the one of RCU core.

Fixes: cff9b2332a ("kernel/sched: Modify initial boot task idle setup")
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>

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Frederic Weisbecker 2023-10-27 16:40:47 +02:00

parent 85d68222dd

commit 2be4686d86

2 changed files with 9 additions and 0 deletions

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2

kernel/rcu/rcu.h

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7

kernel/rcu/tree.c

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