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

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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>
This commit is contained in:
Paul E. McKenney
2023-01-31 16:12:18 -08:00
committed by Boqun Feng
parent ef1ef3d476
commit 6bc6e6b275
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/refscale.c
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@@ -1031,7 +1031,7 @@ ref_scale_cleanup(void)
static int static int
ref_scale_shutdown(void *arg) ref_scale_shutdown(void *arg)
{ {
wait_event(shutdown_wq, shutdown_start); wait_event_idle(shutdown_wq, shutdown_start);
smp_mb(); // Wake before output. smp_mb(); // Wake before output.
ref_scale_cleanup(); ref_scale_cleanup();