diff mbox series

[6/6] rcu: Add comment to rcu_do_batch() identifying rcuoc code path

Message ID 20230315193851.8598-6-joel@joelfernandes.org (mailing list archive)
State Accepted
Commit 90ebe42f2b5b4558be5fc7513bb6b67edd6db38d
Headers show
Series [1/6] srcu: Add comments for srcu_size_state | expand

Commit Message

Joel Fernandes March 15, 2023, 7:38 p.m. UTC 
From: "Paul E. McKenney" <paulmck@kernel.org>

This commit adds a comment to help explain why the "else" clause of the
in_serving_softirq() "if" statement does not need to enforce a time limit.
The reason is that this "else" clause handles rcuoc kthreads that do not
block handlers for other softirq vectors.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
 kernel/rcu/tree.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 8e880c09ab59..06cc6a6ad819 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2131,6 +2131,8 @@  static void rcu_do_batch(struct rcu_data *rdp)
 				break;
 			}
 		} else {
+			// In rcuoc context, so no worries about depriving
+			// other softirq vectors of CPU cycles.
 			local_bh_enable();
 			lockdep_assert_irqs_enabled();
 			cond_resched_tasks_rcu_qs();