This is a note to let you know that I've just added the patch titled
refscale: Move shutdown from wait_event() to wait_event_idle()
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
refscale-move-shutdown-from-wait_event-to-wait_event.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 16fbfae4e4b87648bce9269482bc089aa4d437e2
Author: Paul E. McKenney <paulmck@xxxxxxxxxx>
Date: Tue Jan 31 16:12:18 2023 -0800
refscale: Move shutdown from wait_event() to wait_event_idle()
[ Upstream commit 6bc6e6b27524304aadb9c04611ddb1c84dd7617a ]
The ref_scale_shutdown() kthread/function uses wait_event() to wait for
the refscale test to complete. However, although the read-side tests
are normally extremely fast, there is no law against specifying a very
large value for the refscale.loops module parameter or against having
a slow read-side primitive. Either way, this might well trigger the
hung-task timeout.
This commit therefore replaces those wait_event() calls with calls to
wait_event_idle(), which do not trigger the hung-task timeout.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index 435c884c02b5c..d49a9d66e0000 100644
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -795,7 +795,7 @@ ref_scale_cleanup(void)
static int
ref_scale_shutdown(void *arg)
{
- wait_event(shutdown_wq, shutdown_start);
+ wait_event_idle(shutdown_wq, shutdown_start);
smp_mb(); // Wake before output.
ref_scale_cleanup();
