Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.15 1/2] refscale: Move shutdown from wait_event() to wait_event_idle() | Date | Fri, 28 Apr 2023 21:59:10 -0400 |
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From: "Paul E. McKenney" <paulmck@kernel.org>
[ 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@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- kernel/rcu/refscale.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c index 66dc14cf5687e..5abb0cf52803a 100644 --- a/kernel/rcu/refscale.c +++ b/kernel/rcu/refscale.c @@ -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(); -- 2.39.2
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