When migrating callbacks from a newly offlined CPU, we are already
holding the root rcu_node structure's lock, so it costs almost nothing
to advance and accelerate the newly migrated callbacks. This patch
therefore makes this advancing and acceleration happen.
Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
---
kernel/rcu/tree.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 58ab489eca66..f9f01aeb5add 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3935,6 +3935,7 @@ static void rcu_migrate_callbacks(int cpu, struct
rcu_state *rsp)
rcu_advance_cbs(rsp, rnp_root, rdp); /* Leverage recent GPs. */
rcu_send_cbs_to_orphanage(cpu, rsp, rnp, rdp);
rcu_adopt_orphan_cbs(rsp, flags);
+ rcu_advance_cbs(rsp, rnp_root, my_rdp); /* Assign GP to pending CBs. */
raw_spin_unlock_irqrestore_rcu_node(rnp_root, flags);
WARN_ONCE(rcu_segcblist_n_cbs(&rdp->cblist) != 0 ||
!rcu_segcblist_empty(&rdp->cblist),
--
2.5.2
