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 <20201001175841.GS4162920@elver.google.com>
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From:   Andrey Konovalov <andreyknvl@google.com>
Date:   Thu, 1 Oct 2020 23:59:10 +0200
Message-ID: <CAAeHK+y4cn5sZeoeL1SkwA70kFcgneZiFgs6EwVR=7SaHgi5LQ@mail.gmail.com>
Subject: Re: [PATCH v3 32/39] kasan: define KASAN_GRANULE_SIZE for HW_TAGS
To:     Marco Elver <elver@google.com>
Cc:     Dmitry Vyukov <dvyukov@google.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        kasan-dev <kasan-dev@googlegroups.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Evgenii Stepanov <eugenis@google.com>,
        Elena Petrova <lenaptr@google.com>,
        Branislav Rankov <Branislav.Rankov@arm.com>,
        Kevin Brodsky <kevin.brodsky@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Linux Memory Management List <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>
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On Thu, Oct 1, 2020 at 7:58 PM <elver@google.com> wrote:
>
> On Fri, Sep 25, 2020 at 12:50AM +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 <andreyknvl@google.com>
> > Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
>
> Reviewed-by: Marco Elver <elver@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 9c73f324e3ce..bd51ab72c002 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)
>
> Why braces? Shouldn't MTE_GRANULE_SIZE already have braces?

Will fix in v4, thanks!

>
> > +#endif
> > +
> >  #define KASAN_GRANULE_MASK   (KASAN_GRANULE_SIZE - 1)
> >  #define KASAN_GRANULE_PAGE   (KASAN_GRANULE_SIZE << PAGE_SHIFT)
> >
> > --
> > 2.28.0.681.g6f77f65b4e-goog
> >