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

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Date:   Fri, 12 Jan 2018 00:59:57 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....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
Cc:     Kostya Serebryany <kcc@...gle.com>
Subject: Re: [PATCH 2/2] kasan: clean up KASAN_SHADOW_SCALE_SHIFT usage



On 01/11/2018 06:29 PM, Andrey Konovalov wrote:

> diff --git a/arch/arm64/include/asm/kasan.h b/arch/arm64/include/asm/kasan.h
> index e266f80e45b7..811643fe7640 100644
> --- a/arch/arm64/include/asm/kasan.h
> +++ b/arch/arm64/include/asm/kasan.h
> @@ -27,7 +27,8 @@
>   * should satisfy the following equation:
>   *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - (1ULL << 61)

Care to update comments as well?

>   */
> -#define KASAN_SHADOW_OFFSET     (KASAN_SHADOW_END - (1ULL << (64 - 3)))
> +#define KASAN_SHADOW_OFFSET     (KASAN_SHADOW_END - (1ULL << \
> +					(64 - KASAN_SHADOW_SCALE_SHIFT)))
>  
>  void kasan_init(void);
>  void kasan_copy_shadow(pgd_t *pgdir);