diff mbox series

[03/12] rcutorture: Validate get_completed_synchronize_rcu()

Message ID 20220620225128.3842050-3-paulmck@kernel.org (mailing list archive)
State Mainlined
Commit d0eac20f9909de044fbeb958960b08ff235cf8a2
Headers show
Series Polled grace-period updates for v5.20 | expand

Commit Message

Paul E. McKenney June 20, 2022, 10:51 p.m. UTC 
This commit verifies that the RCU grace-period state cookie returned
from get_completed_synchronize_rcu() causes poll_state_synchronize_rcu()
to return true, as required.

This commit is in preparation for polled expedited grace periods.

Link: https://lore.kernel.org/all/20220121142454.1994916-1-bfoster@redhat.com/
Link: https://docs.google.com/document/d/1RNKWW9jQyfjxw2E8dsXVTdvZYh0HnYeSHDKog9jhdN8/edit?usp=sharing
Cc: Brian Foster <bfoster@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ian Kent <raven@themaw.net>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
 kernel/rcu/rcutorture.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 7120165a93426..4ceec9f4169c7 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -338,6 +338,7 @@  struct rcu_torture_ops {
 	void (*sync)(void);
 	void (*exp_sync)(void);
 	unsigned long (*get_gp_state)(void);
+	unsigned long (*get_gp_completed)(void);
 	unsigned long (*start_gp_poll)(void);
 	bool (*poll_gp_state)(unsigned long oldstate);
 	void (*cond_sync)(unsigned long oldstate);
@@ -504,6 +505,7 @@  static struct rcu_torture_ops rcu_ops = {
 	.sync			= synchronize_rcu,
 	.exp_sync		= synchronize_rcu_expedited,
 	.get_gp_state		= get_state_synchronize_rcu,
+	.get_gp_completed	= get_completed_synchronize_rcu,
 	.start_gp_poll		= start_poll_synchronize_rcu,
 	.poll_gp_state		= poll_state_synchronize_rcu,
 	.cond_sync		= cond_synchronize_rcu,
@@ -1254,6 +1256,10 @@  rcu_torture_writer(void *arg)
 					  rcu_torture_writer_state_getname(),
 					  rcu_torture_writer_state,
 					  cookie, cur_ops->get_gp_state());
+				if (cur_ops->get_gp_completed) {
+					cookie = cur_ops->get_gp_completed();
+					WARN_ON_ONCE(!cur_ops->poll_gp_state(cookie));
+				}
 				cur_ops->readunlock(idx);
 			}
 			switch (synctype[torture_random(&rand) % nsynctypes]) {