[PATCH tip/core/rcu 15/19] scftorture: Check unexpected "switch" statement value

paulmck
2020-08-31T18:08:31Z

This commit adds a "default" case to the switch statement in
scftorture_invoke_one() which contains a WARN_ON_ONCE() and an assignment
to ->scfc_out to suppress knock-on warnings. These knock-on warnings
could otherwise cause the user to think that there was a memory-ordering
problem in smp_call_function() instead of a bug in scftorture.c itself.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/scftorture.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/kernel/scftorture.c b/kernel/scftorture.c
index 9180de7..d9c01c7 100644
--- a/kernel/scftorture.c
+++ b/kernel/scftorture.c
@@ -357,6 +357,10 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
}
smp_call_function(scf_handler, scfcp, scfsp->scfs_wait);
break;
+ default:
+ WARN_ON_ONCE(1);
+ if (scfcp)
+ scfcp->scfc_out = true;
}
if (scfcp && scfsp->scfs_wait) {
if (WARN_ON_ONCE(!scfcp->scfc_out))
--
2.9.5