[PATCH mm] kasan: initialize read-write lock in stack ring

[andrey.konovalov@xxxxxxxxx]

From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>

Use __RW_LOCK_UNLOCKED to initialize stack_ring.lock.

Reported-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>

---

Andrew, could you please fold this patch into:
"kasan: implement stack ring for tag-based modes".
---
 mm/kasan/tags.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c
index 9d867cae1b7b..67a222586846 100644
--- a/mm/kasan/tags.c
+++ b/mm/kasan/tags.c
@@ -36,7 +36,9 @@ DEFINE_STATIC_KEY_TRUE(kasan_flag_stacktrace);
 /* Non-zero, as initial pointer values are 0. */
 #define STACK_RING_BUSY_PTR ((void *)1)
 
-struct kasan_stack_ring stack_ring;
+struct kasan_stack_ring stack_ring = {
+	.lock = __RW_LOCK_UNLOCKED(stack_ring.lock)
+};
 
 /* kasan.stacktrace=off/on */
 static int __init early_kasan_flag_stacktrace(char *arg)
-- 
2.25.1