linux-kernel - Re: [PATCH v6 04/18] kasan: sw_tags: Support tag widths less than 8 bits

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Message-ID: <6rh6ynwrmh7afqkfyfphiy6rv2xjpdpcotzooqfye6lg7rddhe@betrc4geghsk>
Date: Mon, 17 Nov 2025 18:35:38 +0000
From: Maciej Wieczór-Retman <m.wieczorretman@...me>
To: Alexander Potapenko <glider@...gle.com>
Cc: xin@...or.com, peterz@...radead.org, kaleshsingh@...gle.com, kbingham@...nel.org, akpm@...ux-foundation.org, nathan@...nel.org, ryabinin.a.a@...il.com, dave.hansen@...ux.intel.com, bp@...en8.de, morbo@...gle.com, jeremy.linton@....com, smostafa@...gle.com, kees@...nel.org, baohua@...nel.org, vbabka@...e.cz, justinstitt@...gle.com, wangkefeng.wang@...wei.com, leitao@...ian.org, jan.kiszka@...mens.com, fujita.tomonori@...il.com, hpa@...or.com, urezki@...il.com, ubizjak@...il.com, ada.coupriediaz@....com, nick.desaulniers+lkml@...il.com, ojeda@...nel.org, brgerst@...il.com, elver@...gle.com, pankaj.gupta@....com, mark.rutland@....com, trintaeoitogc@...il.com, jpoimboe@...nel.org, thuth@...hat.com, pasha.tatashin@...een.com, dvyukov@...gle.com, jhubbard@...dia.com, catalin.marinas@....com, yeoreum.yun@....com, mhocko@...e.com, lorenzo.stoakes@...cle.com, samuel.holland@...ive.com, vincenzo.frascino@....com, bigeasy@...utronix.de, surenb@...gle.com, ardb@...nel.org,
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Subject: Re: [PATCH v6 04/18] kasan: sw_tags: Support tag widths less than 8 bits

On 2025-11-10 at 18:37:59 +0100, Alexander Potapenko wrote:
>> +++ b/include/linux/kasan-tags.h
>> @@ -2,13 +2,16 @@
>>  #ifndef _LINUX_KASAN_TAGS_H
>>  #define _LINUX_KASAN_TAGS_H
>>
>> +#include <asm/kasan.h>
>
>In Patch 07, this is changed to `#include <asm/kasan-tags.h>` what is
>the point of doing that?
>Wouldn't it be better to move the addition of kasan-tags.h for
>different arches to this patch from Patch 07?

I wanted to keep the split between adding the generalized definitions
that Samuel did here, and my arch specific changes. Thought it'd be
easier to review for people if it was kept this way. But maybe it's a
good idea to just move the asm/kasan-tags changes here too, I'll
rearange the code a bit between these two patches.