kmsan: make the tests compatible with kmsan.panic=1

It's useful to have both tests and kmsan.panic=1 during development, but
right now the warnings, that the tests cause, lead to kernel panics.

Temporarily set kmsan.panic=0 for the duration of the KMSAN testing.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ilya Leoshkevich <[email protected]>
Reviewed-by: Alexander Potapenko <[email protected]>
Cc: Alexander Gordeev <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Hyeonggon Yoo <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Masami Hiramatsu (Google) <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Steven Rostedt (Google) <[email protected]>
Cc: Sven Schnelle <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/mm/kmsan/kmsan_test.c b/mm/kmsan/kmsan_test.c
index 018069aba92b..13236d579eba 100644
--- a/mm/kmsan/kmsan_test.c
+++ b/mm/kmsan/kmsan_test.c
@@ -686,9 +686,13 @@ static void test_exit(struct kunit *test)
 {
 }
 
+static int orig_panic_on_kmsan;
+
 static int kmsan_suite_init(struct kunit_suite *suite)
 {
 	register_trace_console(probe_console, NULL);
+	orig_panic_on_kmsan = panic_on_kmsan;
+	panic_on_kmsan = 0;
 	return 0;
 }
 
@@ -696,6 +700,7 @@ static void kmsan_suite_exit(struct kunit_suite *suite)
 {
 	unregister_trace_console(probe_console, NULL);
 	tracepoint_synchronize_unregister();
+	panic_on_kmsan = orig_panic_on_kmsan;
 }
 
 static struct kunit_suite kmsan_test_suite = {