[PATCH mm v4 34/39] kasan: simplify kasan_init_hw_tags

[andrey.konovalov at linux.dev]

From: Andrey Konovalov <andreyknvl at google.com>

Simplify kasan_init_hw_tags():

- Remove excessive comments in kasan_arg_mode switch.
- Combine DEFAULT and ON cases in kasan_arg_stacktrace switch.

Signed-off-by: Andrey Konovalov <andreyknvl at google.com>

---

Changes v1->v2:
- Add this patch.
---
 mm/kasan/hw_tags.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
index 6509809dd5d8..99230e666c1b 100644
--- a/mm/kasan/hw_tags.c
+++ b/mm/kasan/hw_tags.c
@@ -159,20 +159,15 @@ void __init kasan_init_hw_tags(void)
 
 	switch (kasan_arg_mode) {
 	case KASAN_ARG_MODE_DEFAULT:
-		/*
-		 * Default to sync mode.
-		 */
+		/* Default to sync mode. */
 		fallthrough;
 	case KASAN_ARG_MODE_SYNC:
-		/* Sync mode enabled. */
 		kasan_mode = KASAN_MODE_SYNC;
 		break;
 	case KASAN_ARG_MODE_ASYNC:
-		/* Async mode enabled. */
 		kasan_mode = KASAN_MODE_ASYNC;
 		break;
 	case KASAN_ARG_MODE_ASYMM:
-		/* Asymm mode enabled. */
 		kasan_mode = KASAN_MODE_ASYMM;
 		break;
 	}
@@ -180,14 +175,13 @@ void __init kasan_init_hw_tags(void)
 	switch (kasan_arg_stacktrace) {
 	case KASAN_ARG_STACKTRACE_DEFAULT:
 		/* Default to enabling stack trace collection. */
+		fallthrough;
+	case KASAN_ARG_STACKTRACE_ON:
 		static_branch_enable(&kasan_flag_stacktrace);
 		break;
 	case KASAN_ARG_STACKTRACE_OFF:
 		/* Do nothing, kasan_flag_stacktrace keeps its default value. */
 		break;
-	case KASAN_ARG_STACKTRACE_ON:
-		static_branch_enable(&kasan_flag_stacktrace);
-		break;
 	}
 
 	pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, stacktrace=%s)\n",
-- 
2.25.1