rcu: Mark loads from rcu_state.n_online_cpus

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The rcu_state.n_online_cpus value is only ever updated by CPU-hotplug
operations, which are serialized.  However, this value is read locklessly.
This commit therefore marks those reads.  While in the area, it also
adds ASSERT_EXCLUSIVE_WRITER() calls just in case parallel CPU hotplug
becomes a thing.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>

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Paul E. McKenney 2024-03-07 20:14:55 -08:00 • committed by Uladzislau Rezki (Sony)

parent a542d116ba

commit 09e077cf22

2 changed files with 7 additions and 3 deletions

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4

kernel/rcu/tree.c

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6

kernel/rcu/tree_stall.h

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