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refscale: Move shutdown from wait_event() to wait_event_idle()

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[ Upstream commit 6bc6e6b275 ]

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@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul E. McKenney 2023-01-31 16:12:18 -08:00 • committed by Justin Hammond
parent a5138daef7
commit 908fc57433
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/refscale.c
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@ -777,7 +777,7 @@ 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();