linux-kernel - Re: [PATCH 10/12] arm64: kasan: simplify and inline MTE functions

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Message-Id: <20210201144407.dd603ec4edcd589643654057@linux-foundation.org>
Date:   Mon, 1 Feb 2021 14:44:07 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Will Deacon <will.deacon@....com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/12] arm64: kasan: simplify and inline MTE functions

On Mon,  1 Feb 2021 20:43:34 +0100 Andrey Konovalov <andreyknvl@...gle.com> wrote:

> This change provides a simpler implementation of mte_get_mem_tag(),
> mte_get_random_tag(), and mte_set_mem_tag_range().
> 
> Simplifications include removing system_supports_mte() checks as these
> functions are onlye called from KASAN runtime that had already checked
> system_supports_mte(). Besides that, size and address alignment checks
> are removed from mte_set_mem_tag_range(), as KASAN now does those.
> 
> This change also moves these functions into the asm/mte-kasan.h header
> and implements mte_set_mem_tag_range() via inline assembly to avoid
> unnecessary functions calls.
> 
> Co-developed-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

Co-developed-by requires a Signed-off-by: as well.  Vincenzo, please
send us one?