linux-kernel - Re: [PATCH v8 04/14] x86/kasan: Add arch specific kasan functions

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Message-ID: <aWZups-lK-J3NwgS@wieczorr-mobl1.localdomain>
Date: Tue, 13 Jan 2026 16:12:01 +0000
From: Maciej Wieczor-Retman <m.wieczorretman@...me>
To: Andrey Konovalov <andreyknvl@...il.com>
Cc: Andrey Ryabinin <ryabinin.a.a@...il.com>, Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, Vincenzo Frascino <vincenzo.frascino@....com>, Thomas Gleixner <tglx@...nel.org>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, Andrew Morton <akpm@...ux-foundation.org>, David Hildenbrand <david@...nel.org>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, "Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, Axel Rasmussen <axelrasmussen@...gle.com>, Yuanchu Xie <yuanchu@...gle.com>, Wei Xu <weixugc@...gle.com>, Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>, kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v8 04/14] x86/kasan: Add arch specific kasan functions

On 2026-01-13 at 02:21:15 +0100, Andrey Konovalov wrote:
>On Mon, Jan 12, 2026 at 6:27 PM Maciej Wieczor-Retman
><m.wieczorretman@...me> wrote:
>>
>> From: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
>> diff --git a/include/linux/kasan-tags.h b/include/linux/kasan-tags.h
>> index ad5c11950233..e4f26bec3673 100644
>> --- a/include/linux/kasan-tags.h
>> +++ b/include/linux/kasan-tags.h
>> @@ -10,6 +10,8 @@
>>  #define KASAN_TAG_WIDTH                0
>>  #endif
>>
>> +#define KASAN_TAG_BYTE_MASK    ((1UL << KASAN_TAG_WIDTH) - 1)
>
>How about KASAN_TAG_BITS_MASK?
>
>When KASAN_TAG_WIDTH == 4, the mask does not cover a whole byte.

Yes, I suppose that name makes more sense :)

-- 
Kind regards
Maciej Wieczór-Retman