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    SubjectRe: [PATCH v9 36/44] kasan: define KASAN_GRANULE_SIZE for HW_TAGS
    On Tue, Nov 10, 2020 at 11:12 PM Andrey Konovalov <andreyknvl@google.com> 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 <andreyknvl@google.com>
    > Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
    > Reviewed-by: Marco Elver <elver@google.com>
    Reviewed-by: Alexander Potapenko <glider@google.com>

    > ---
    > Change-Id: I5d1117e6a991cbca00d2cfb4ba66e8ae2d8f513a
    > ---
    > mm/kasan/kasan.h | 6 ++++++
    > 1 file changed, 6 insertions(+)
    >
    > diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
    > index ae7def3b725b..d745a78745dd 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-kasan.h>
    > +#define KASAN_GRANULE_SIZE MTE_GRANULE_SIZE
    > +#endif
    > +
    > #define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1)
    > #define KASAN_GRANULE_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT)
    >
    > --
    > 2.29.2.222.g5d2a92d10f8-goog
    >


    --
    Alexander Potapenko
    Software Engineer

    Google Germany GmbH
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    80636 München

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