# Re: \[PATCH 28/35\] kasan: define KASAN\_GRANULE\_SIZE for HW\_TAGS

- From: Catalin Marinas \<catalin.marinas@arm.com\>
- Date: 2020-08-27 10:41:55 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2020/08/6084905
- Thread: https://ratatoskr.run/linux-arm-kernel/2020/08/6068760/t.md

```text
On Fri, Aug 14, 2020 at 07:27:10PM +0200, Andrey Konovalov wrote:
> Hardware tag-based KASAN has granules of MTE_GRANULE_SIZE. Define
> KASAN_GRANULE_SIZE to MTE_GRANULE_SIZE for CONFIG_KASAN_HW_TAGS.
> 
> Signed-off-by: Andrey Konovalov <redacted>
> ---
>  mm/kasan/kasan.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
> index 1d3c7c6ce771..4d8e229f8e01 100644
> --- a/mm/kasan/kasan.h
> +++ b/mm/kasan/kasan.h
> @@ -5,7 +5,13 @@
>  #include <linux/kasan.h>
>  #include <linux/stackdepot.h>
>  
> +#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
>  #define KASAN_GRANULE_SIZE	(1UL << KASAN_SHADOW_SCALE_SHIFT)
> +#else
> +#include <asm/mte.h>

You could only include the new asm/mte-def.h file (currently mte_asm.h).

> +#define KASAN_GRANULE_SIZE	(MTE_GRANULE_SIZE)
> +#endif
> +
>  #define KASAN_GRANULE_MASK	(KASAN_GRANULE_SIZE - 1)
>  
>  #define KASAN_TAG_KERNEL	0xFF /* native kernel pointers tag */
> -- 
> 2.28.0.220.ged08abb693-goog
> 

-- 
Catalin

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