[PATCH 10/12] arm64: kasan: simplify and inline MTE functions

Andrew Morton akpm at linux-foundation.org
Mon Feb 1 17:44:07 EST 2021

On Mon,  1 Feb 2021 20:43:34 +0100 Andrey Konovalov <andreyknvl at google.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 at arm.com>
> Signed-off-by: Andrey Konovalov <andreyknvl at google.com>

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

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