[v4] mm/kasan: make kasan=on|off work for all three modes

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

Posted by Baoquan He 3 days, 17 hours ago

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

Signed-off-by: Baoquan He <bhe@redhat.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

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

Posted by Alexander Potapenko 3 days, 5 hours ago

> @@ -30,7 +30,7 @@ static inline void kasan_enable(void)
>  /* For architectures that can enable KASAN early, use compile-time check. */
I think the behavior of kasan_enabled() is inconsistent with this comment now.
>  static __always_inline bool kasan_enabled(void)
>  {
> -       return IS_ENABLED(CONFIG_KASAN);
> +       return false;
>  }

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

Posted by Baoquan He 1 day, 18 hours ago

On 11/28/25 at 04:50pm, Alexander Potapenko wrote:
> > @@ -30,7 +30,7 @@ static inline void kasan_enable(void)
> >  /* For architectures that can enable KASAN early, use compile-time check. */
> I think the behavior of kasan_enabled() is inconsistent with this comment now.

You are right, that line should be removed. Thanks for careful checking.

> >  static __always_inline bool kasan_enabled(void)
> >  {
> > -       return IS_ENABLED(CONFIG_KASAN);
> > +       return false;
> >  }
>