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

[PATCH v4 03/12] mm/kasan/sw_tags: don't initialize kasan if it's disabled

Posted by Baoquan He 2 months, 1 week ago

Signed-off-by: Baoquan He <bhe@redhat.com>
---
 mm/kasan/sw_tags.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c
index 6c1caec4261a..58edb68efc09 100644
--- a/mm/kasan/sw_tags.c
+++ b/mm/kasan/sw_tags.c
@@ -40,6 +40,9 @@ void __init kasan_init_sw_tags(void)
 {
 	int cpu;
 
+	if (kasan_arg_disabled)
+		return;
+
 	for_each_possible_cpu(cpu)
 		per_cpu(prng_state, cpu) = (u32)get_cycles();
 
-- 
2.41.0

Re: [PATCH v4 03/12] mm/kasan/sw_tags: don't initialize kasan if it's disabled

Posted by Andrey Konovalov 2 months ago

On Fri, Nov 28, 2025 at 4:34 AM Baoquan He <bhe@redhat.com> wrote:
>

This commit message is too empty :)

> Signed-off-by: Baoquan He <bhe@redhat.com>
> ---
>  mm/kasan/sw_tags.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c
> index 6c1caec4261a..58edb68efc09 100644
> --- a/mm/kasan/sw_tags.c
> +++ b/mm/kasan/sw_tags.c
> @@ -40,6 +40,9 @@ void __init kasan_init_sw_tags(void)
>  {
>         int cpu;
>

Here and in other places where you check this flag, add a comment: "If
KASAN is disabled via command line, don't initialize it.".



> +       if (kasan_arg_disabled)
> +               return;
> +
>         for_each_possible_cpu(cpu)
>                 per_cpu(prng_state, cpu) = (u32)get_cycles();
>
> --
> 2.41.0
>