Commit 09853fb8 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Joel Fernandes (Google)
Browse files

rcu: Add comment to rcu_do_batch() identifying rcuoc code path 



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.

Acked-by: default avatarJoel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Signed-off-by: default avatarJoel Fernandes (Google) <joel@joelfernandes.org>
parent 81573694

kernel/rcu/tree.c

+2 −0
Original line number Diff line number Diff line
@@ -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();