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rcu: Clarify comments about FQS loop reporting quiescent states

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Since at least v4.19, the FQS loop no longer reports quiescent states
for offline CPUs except in emergency situations.

This commit therefore fixes the comment in rcu_gp_init() to match the
current code.

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Joel Fernandes (Google) 2020-08-07 13:07:19 -04:00 committed by Paul E. McKenney
parent 4569c5ee95
commit f37599e6f0
1 changed files with 7 additions and 4 deletions
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11
kernel/rcu/tree.c
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@ -1706,10 +1706,13 @@ static bool rcu_gp_init(void)
raw_spin_unlock_irq_rcu_node(rnp);
/*
* Apply per-leaf buffered online and offline operations to the
* rcu_node tree. Note that this new grace period need not wait
* for subsequent online CPUs, and that quiescent-state forcing
* will handle subsequent offline CPUs.
* Apply per-leaf buffered online and offline operations to
* the rcu_node tree. Note that this new grace period need not
* wait for subsequent online CPUs, and that RCU hooks in the CPU
* offlining path, when combined with checks in this function,
* will handle CPUs that are currently going offline or that will
* go offline later. Please also refer to "Hotplug CPU" section
* of RCU's Requirements documentation.
*/
rcu_state.gp_state = RCU_GP_ONOFF;
rcu_for_each_leaf_node(rnp) {