From: "Paul E. McKenney" paulmck@kernel.org
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 --- 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 afa3e1a2f690..1970ce5f22d4 100644 --- a/kernel/rcu/refscale.c +++ b/kernel/rcu/refscale.c @@ -1031,7 +1031,7 @@ 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();