rcutorture: Add diagnostic for unscheduled system shutdown

Currently, rcutorture can terminate via rmmod, via self-shutdown,
via something else shutting the system down, or of course the usual
catastrophic termination.  The first two get flagged, so this commit adds
a message for the third.  For the fourth, your warranty is void as always.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/kernel/torture.c b/kernel/torture.c
index ed360cf948da..d51de3029a5c 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -438,10 +438,12 @@ static int torture_shutdown_notify(struct notifier_block *unused1,
                                    unsigned long unused2, void *unused3)
 {
         mutex_lock(&fullstop_mutex);
-        if (fullstop == FULLSTOP_DONTSTOP)
+        if (fullstop == FULLSTOP_DONTSTOP) {
+                VERBOSE_TOROUT_STRING("Unscheduled system shutdown detected");
                 fullstop = FULLSTOP_SHUTDOWN;
-        else
+        } else {
                 pr_warn("Concurrent rmmod and shutdown illegal!\n");
+        }
         mutex_unlock(&fullstop_mutex);
         return NOTIFY_DONE;
 }