linux-kernel - Re: [PATCH v2 33/37] kasan, arm64: implement HW

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Date:   Fri, 18 Sep 2020 12:46:50 +0200
From:   Marco Elver <elver@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kasan-dev@...glegroups.com,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...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 v2 33/37] kasan, arm64: implement HW_TAGS runtime

On Tue, Sep 15, 2020 at 11:16PM +0200, Andrey Konovalov wrote:
[...]
>  arch/arm64/include/asm/memory.h   |  4 +-
>  arch/arm64/kernel/setup.c         |  1 -
>  include/linux/kasan.h             |  6 +--
>  include/linux/mm.h                |  2 +-
>  include/linux/page-flags-layout.h |  2 +-
>  mm/kasan/Makefile                 |  5 ++
>  mm/kasan/common.c                 | 14 +++---
>  mm/kasan/kasan.h                  | 17 +++++--
>  mm/kasan/report_tags_hw.c         | 47 +++++++++++++++++++
>  mm/kasan/report_tags_sw.c         |  2 +-
>  mm/kasan/shadow.c                 |  2 +-
>  mm/kasan/tags_hw.c                | 78 +++++++++++++++++++++++++++++++
>  mm/kasan/tags_sw.c                |  2 +-
>  13 files changed, 162 insertions(+), 20 deletions(-)
>  create mode 100644 mm/kasan/report_tags_hw.c
>  create mode 100644 mm/kasan/tags_hw.c
[...]
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index 77c4c9bad1b8..5985be8af2c6 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -358,7 +358,6 @@ void __init __no_sanitize_address setup_arch(char **cmdline_p)
>  	smp_init_cpus();
>  	smp_build_mpidr_hash();
>  
> -	/* Init percpu seeds for random tags after cpus are set up. */

Why was the comment removed and not updated?

>  	kasan_init_tags();
>  
>  #ifdef CONFIG_ARM64_SW_TTBR0_PAN