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

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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: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
This commit is contained in:
Paul E. McKenney 2023-03-04 13:40:55 -08:00 committed by Joel Fernandes (Google)
parent 81573694a4
commit 09853fb89f
1 changed files with 2 additions and 0 deletions
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kernel/rcu/tree.c
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@ -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();