linux-kernel - Re: [PATCH 2/2] kasan: clean up KASAN_SHADOW_SCALE

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Date:   Thu, 11 Jan 2018 17:33:10 +0000
From:   Will Deacon <will.deacon@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        Kostya Serebryany <kcc@...gle.com>
Subject: Re: [PATCH 2/2] kasan: clean up KASAN_SHADOW_SCALE_SHIFT usage

On Thu, Jan 11, 2018 at 04:29:09PM +0100, Andrey Konovalov wrote:
> Right now the fact that KASAN uses a single shadow byte for 8 bytes of
> memory is scattered all over the code.
> 
> This change defines KASAN_SHADOW_SCALE_SHIFT early in asm include files
> and makes use of this constant where necessary.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> ---
>  arch/arm64/include/asm/kasan.h  | 3 ++-
>  arch/arm64/include/asm/memory.h | 3 ++-
>  arch/arm64/mm/kasan_init.c      | 3 ++-
>  arch/x86/include/asm/kasan.h    | 8 ++++++--
>  include/linux/kasan.h           | 2 --
>  5 files changed, 12 insertions(+), 7 deletions(-)

For the arm64 parts:

Acked-by: Will Deacon <will.deacon@....com>

Will