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Subject: Re: [PATCH 31/35] kasan, arm64: implement HW_TAGS runtime
To:     Catalin Marinas <catalin.marinas@arm.com>,
        Andrey Konovalov <andreyknvl@google.com>
Cc:     Dmitry Vyukov <dvyukov@google.com>, kasan-dev@googlegroups.com,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Marco Elver <elver@google.com>,
        Evgenii Stepanov <eugenis@google.com>,
        Elena Petrova <lenaptr@google.com>,
        Branislav Rankov <Branislav.Rankov@arm.com>,
        Kevin Brodsky <kevin.brodsky@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
References: <cover.1597425745.git.andreyknvl@google.com>
 <4e86d422f930831666137e06a71dff4a7a16a5cd.1597425745.git.andreyknvl@google.com>
 <20200827104517.GH29264@gaia>
From:   Vincenzo Frascino <vincenzo.frascino@arm.com>
Message-ID: <567f90b6-fa25-6ef3-73b8-45462cc7ceb2@arm.com>
Date:   Thu, 27 Aug 2020 12:35:41 +0100
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On 8/27/20 11:45 AM, Catalin Marinas wrote:
> On Fri, Aug 14, 2020 at 07:27:13PM +0200, Andrey Konovalov wrote:
>> diff --git a/mm/kasan/mte.c b/mm/kasan/mte.c
>> new file mode 100644
>> index 000000000000..43b7d74161e5
>> --- /dev/null
>> +++ b/mm/kasan/mte.c
> 
> Since this is an arm64-specific kasan backend, I wonder whether it makes
> more sense to keep it under arch/arm64 (mte-kasan.c).
>

Yes I agree, I had a similar comment in patch 25. I think we should implement
the mte backend entirely in arch code because other architectures might want to
enable the feature (e.g. Sparc ADI).

>> diff --git a/mm/kasan/report_mte.c b/mm/kasan/report_mte.c
>> new file mode 100644
>> index 000000000000..dbbf3aaa8798
>> --- /dev/null
>> +++ b/mm/kasan/report_mte.c
> 
> Same for this one.
> 

-- 
Regards,
Vincenzo