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authorPaul E. McKenney <paulmck@kernel.org>2023-03-04 13:40:55 -0800
committerJoel Fernandes (Google) <joel@joelfernandes.org>2023-04-05 13:47:18 +0000
commit09853fb89f6bc46727ccd325c0f6f266df51d155 (patch)
tree9c84f7bb1e3931bff9a6d2a078a157d5c15ec5b7 /kernel/rcu
parent81573694a48599f1edf928f390c6dcab5cbb6f49 (diff)
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: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c2
1 files changed, 2 insertions, 0 deletions
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();