rcu: Comment why callbacks migration can't wait for CPUHP_RCUTREE_PREP

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The callbacks migration is performed through an explicit call from
the hotplug control CPU right after the death of the target CPU and
before proceeding with the CPUHP_ teardown functions.

This is unusual but necessary and yet uncommented. Summarize the reason
as explained in the changelog of:

	a58163d8ca (rcu: Migrate callbacks earlier in the CPU-offline timeline)

Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>

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Frederic Weisbecker 2023-09-08 22:36:03 +02:00

parent 448e9f34d9

commit a28ab03b49

1 changed files with 7 additions and 0 deletions

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kernel/cpu.c

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