Set SEGCBLIST_SOFTIRQ_ONLY once everything is settled. After that, the
callbacks are handled locklessly and locally.
Inspired-by: Paul E. McKenney <paul...@kernel.org>
Signed-off-by: Frederic Weisbecker <frede...@kernel.org>
Cc: Paul E. McKenney <paul...@kernel.org>
Cc: Josh Triplett <j...@joshtriplett.org>
Cc: Steven Rostedt <rost...@goodmis.org>
Cc: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
Cc: Lai Jiangshan <jiangshan...@gmail.com>
Cc: Joel Fernandes <j...@joelfernandes.org>
Cc: Neeraj Upadhyay <neer...@codeaurora.org>
---
kernel/rcu/tree_plugin.h | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 49bd42995ae7..2f083beab9d9 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2353,7 +2353,14 @@ static int __rcu_nocb_rdp_deoffload(struct rcu_data *rdp)
* enqueued on bypass.
*/
rcu_nocb_flush_bypass(rdp, NULL, jiffies);
- rcu_nocb_unlock_irqrestore(rdp, flags);
+ rcu_segcblist_set_flags(cblist, SEGCBLIST_SOFTIRQ_ONLY);
+ /*
+ * With SEGCBLIST_SOFTIRQ_ONLY, we can't use
+ * rcu_nocb_unlock_irqrestore() anymore. Theoretically we
+ * could set SEGCBLIST_SOFTIRQ_ONLY with cb unlocked and IRQs
+ * disabled now, but let's be paranoid.
+ */
+ raw_spin_unlock_irqrestore(&rdp->nocb_lock, flags);
return ret;
}
--
2.25.1
