rcu: Upgrade header comment for poll_state_synchronize_rcu()

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This commit emphasizes the possibility of concurrent calls to
synchronize_rcu() and synchronize_rcu_expedited() causing one or
the other of the two grace periods being lost from the viewpoint of
poll_state_synchronize_rcu().

If you cannot afford to lose grace periods this way, you should
instead use the _full() variants of the polled RCU API, for
example, poll_state_synchronize_rcu_full().

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Paul E. McKenney 2022-11-25 08:43:10 -08:00

parent 253cbbff62

commit 95ff24ee7b

1 changed files with 9 additions and 1 deletions

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kernel/rcu/tree.c

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