linux-kernel - [PATCH v4 12/12] mm/kasan: make kasan=on|off take effect for all three modes

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Message-ID: <20251128033320.1349620-13-bhe@redhat.com>
Date: Fri, 28 Nov 2025 11:33:20 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-mm@...ck.org
Cc: ryabinin.a.a@...il.com,
	andreyknvl@...il.com,
	glider@...gle.com,
	dvyukov@...gle.com,
	vincenzo.frascino@....com,
	akpm@...ux-foundation.org,
	kasan-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	kexec@...ts.infradead.org,
	elver@...gle.com,
	sj@...nel.org,
	lorenzo.stoakes@...cle.com,
	snovitoll@...il.com,
	christophe.leroy@...roup.eu,
	Baoquan He <bhe@...hat.com>
Subject: [PATCH v4 12/12] mm/kasan: make kasan=on|off take effect for all three modes

Now everything is ready, set kasan=off can disable kasan for all
three modes.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 include/linux/kasan-enabled.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/kasan-enabled.h b/include/linux/kasan-enabled.h
index b05ec6329fbe..b33c92cc6bd8 100644
--- a/include/linux/kasan-enabled.h
+++ b/include/linux/kasan-enabled.h
@@ -4,6 +4,7 @@
 
 #include <linux/static_key.h>
 
+#ifdef CONFIG_KASAN
 extern bool kasan_arg_disabled;
 
 /*
@@ -12,7 +13,6 @@ extern bool kasan_arg_disabled;
  */
 DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled);
 
-#if defined(CONFIG_ARCH_DEFER_KASAN) || defined(CONFIG_KASAN_HW_TAGS)
 /*
  * Runtime control for shadow memory initialization or HW_TAGS mode.
  * Uses static key for architectures that need deferred KASAN or HW_TAGS.
@@ -30,7 +30,7 @@ static inline void kasan_enable(void)
 /* For architectures that can enable KASAN early, use compile-time check. */
 static __always_inline bool kasan_enabled(void)
 {
-	return IS_ENABLED(CONFIG_KASAN);
+	return false;
 }
 
 static inline void kasan_enable(void) {}
-- 
2.41.0