linux-kernel - Re: linux-next: build failure after merge of the mm-hotfixes tree

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Message-ID: <ja5zht46osfzx7fowemw3v6ucnrugzpnhbf5l5ta7xxuywry6i@3trcfqmhk2ec>
Date: Mon, 8 Dec 2025 11:30:16 +0100
From: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
To: Stephen Rothwell <sfr@...b.auug.org.au>
CC: Andrew Morton <akpm@...ux-foundation.org>, Linux Kernel Mailing List
	<linux-kernel@...r.kernel.org>, Linux Next Mailing List
	<linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the mm-hotfixes tree

Hi!

This flag, KASAN_VMALLOC_KEEP_TAG was defined in the first patch by Jiayuan in
my three piece series [1]. I looked over git logs in mm-unstable and
mm-hotfixes-unstable and I guess it wasn't pulled there but my two following
patches were.

Could you pull the [1] missing patch Andrew? I think that should fix this issue.
Thanks :)

[1] https://lore.kernel.org/all/247fd641cbf4a8e6c8135051772867f6bd2610ad.1764945396.git.m.wieczorretman@pm.me/

kind regards
Maciej Wieczór-Retman

On 2025-12-08 at 08:35:11 +1100, Stephen Rothwell wrote:
>Hi all,
>
>After merging the mm-hotfixes tree, today's linux-next build (x86_64
>allmodconfig) failed like this:
>
>In file included from arch/x86/include/asm/bug.h:193,
>                 from include/linux/bug.h:5,
>                 from include/linux/kasan.h:5,
>                 from mm/kasan/common.c:14:
>mm/kasan/common.c: In function '__kasan_unpoison_vmap_areas':
>mm/kasan/common.c:594:34: error: 'KASAN_VMALLOC_KEEP_TAG' undeclared (first use in this function); did you mean 'KASAN_VMALLOC_PAGE_RANGE'?
>  594 |         if (WARN_ON_ONCE(flags & KASAN_VMALLOC_KEEP_TAG))
>      |                                  ^~~~~~~~~~~~~~~~~~~~~~
>include/asm-generic/bug.h:120:32: note: in definition of macro 'WARN_ON_ONCE'
>  120 |         int __ret_warn_on = !!(condition);                              \
>      |                                ^~~~~~~~~
>mm/kasan/common.c:594:34: note: each undeclared identifier is reported only once for each function it appears in
>  594 |         if (WARN_ON_ONCE(flags & KASAN_VMALLOC_KEEP_TAG))
>      |                                  ^~~~~~~~~~~~~~~~~~~~~~
>include/asm-generic/bug.h:120:32: note: in definition of macro 'WARN_ON_ONCE'
>  120 |         int __ret_warn_on = !!(condition);                              \
>      |                                ^~~~~~~~~
>
>Caused by commit
>
>  6b83afdcfa93 ("kasan: unpoison vms[area] addresses with a common tag")
>
>I have reverted that commit (and the following 2 fixes) for today.
>
>-- 
>Cheers,
>Stephen Rothwell