linux-kernel - Re: [PATCH v3 10/12] kasan/s390: call kasan_init_generic in kasan

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Message-ID: <8412bf39-8235-4abb-ae35-db6029a605b3-agordeev@linux.ibm.com>
Date: Fri, 18 Jul 2025 14:38:12 +0200
From: Alexander Gordeev <agordeev@...ux.ibm.com>
To: Sabyrzhan Tasbolatov <snovitoll@...il.com>
Cc: hca@...ux.ibm.com, christophe.leroy@...roup.eu, andreyknvl@...il.com,
        akpm@...ux-foundation.org, ryabinin.a.a@...il.com, glider@...gle.com,
        dvyukov@...gle.com, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-um@...ts.infradead.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v3 10/12] kasan/s390: call kasan_init_generic in
 kasan_init

On Thu, Jul 17, 2025 at 07:27:30PM +0500, Sabyrzhan Tasbolatov wrote:
> Call kasan_init_generic() which handles Generic KASAN initialization
> and prints the banner. Since s390 doesn't select ARCH_DEFER_KASAN,
> kasan_enable() will be a no-op, and kasan_enabled() will return
> IS_ENABLED(CONFIG_KASAN) for optimal compile-time behavior.
> 
> s390 sets up KASAN mappings in the decompressor and can run with KASAN
> enabled from very early, so it doesn't need runtime control.
> 
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217049
> Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@...il.com>
> ---
>  arch/s390/kernel/early.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
> index 54cf0923050..7ada1324f6a 100644
> --- a/arch/s390/kernel/early.c
> +++ b/arch/s390/kernel/early.c
> @@ -21,6 +21,7 @@
>  #include <linux/kernel.h>
>  #include <asm/asm-extable.h>
>  #include <linux/memblock.h>
> +#include <linux/kasan.h>
>  #include <asm/access-regs.h>
>  #include <asm/asm-offsets.h>
>  #include <asm/machine.h>
> @@ -65,7 +66,7 @@ static void __init kasan_early_init(void)
>  {
>  #ifdef CONFIG_KASAN
>  	init_task.kasan_depth = 0;
> -	pr_info("KernelAddressSanitizer initialized\n");
> +	kasan_init_generic();
>  #endif
>  }

Acked-by: Alexander Gordeev <agordeev@...ux.ibm.com>