linux-kernel - Re: [PATCH v4 24/39] arm64: mte: Add in-kernel MTE helpers

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Message-ID: <20201002135100.GE7034@gaia>
Date:   Fri, 2 Oct 2020 14:51:00 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev@...glegroups.com,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 24/39] arm64: mte: Add in-kernel MTE helpers

On Fri, Oct 02, 2020 at 01:10:25AM +0200, Andrey Konovalov wrote:
> From: Vincenzo Frascino <vincenzo.frascino@....com>
> 
> Provide helper functions to manipulate allocation and pointer tags for
> kernel addresses.
> 
> Low-level helper functions (mte_assign_*, written in assembly) operate
> tag values from the [0x0, 0xF] range. High-level helper functions
> (mte_get/set_*) use the [0xF0, 0xFF] range to preserve compatibility
> with normal kernel pointers that have 0xFF in their top byte.
> 
> MTE_GRANULE_SIZE and related definitions are moved to mte-def.h header
> that doesn't have any dependencies and is safe to include into any
> low-level header.
> 
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Co-developed-by: Andrey Konovalov <andreyknvl@...gle.com>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>