linux-kernel - [PATCH mm v3 33/38] kasan: simplify kasan_init_hw

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Message-Id: <8c59009047ebbb0a8ba3d8c30e2c4fe820fb0c78.1639432170.git.andreyknvl@google.com>
Date:   Mon, 13 Dec 2021 22:55:35 +0100
From:   andrey.konovalov@...ux.dev
To:     Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH mm v3 33/38] kasan: simplify kasan_init_hw_tags

From: Andrey Konovalov <andreyknvl@...gle.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@...gle.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 fb08fe1a3cf7..6f7ed8e3180c 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