At least since v4.19, the FQS loop no longer reports quiescent states
for offline CPUs unless it is an emergency.
This commit therefore fixes the comment in rcu_gp_init() to match the
current code.
Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
---
kernel/rcu/tree.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index a49fa3b60faa..2fb66cdbfa25 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1701,9 +1701,11 @@ static bool rcu_gp_init(void)
/*
* 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.
+ * 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 go offline later. Refer to
+ * RCU's Requirements documentation about hotplug requirements as well.
*/
rcu_state.gp_state = RCU_GP_ONOFF;
rcu_for_each_leaf_node(rnp) {
--
2.28.0.236.gb10cc79966-goog
