Subject: Re: linux-next: build failure after merge of the arm tree

From: Stephen Rothwell <[email-masked]>
Date: Wed, 13 Nov 2024 11:25:04 +1100

Hi all,

On Wed, 13 Nov 2024 10:46:14 +1100 Stephen Rothwell <[email-masked]> wrote:
>
> After merging the arm tree, today's linux-next build (arm
> multi_v7_defconfig) failed like this:
> 
> arch/arm/mm/ioremap.c: In function 'sync_vmalloc_pgds':
> arch/arm/mm/ioremap.c:130:46: error: implicit declaration of function 'kasan_mem_to_shadow'; did you mean 'kmsan_init_shadow'? [-Wimplicit-function-declaration]
>   130 |                 sync_pgds(mm, (unsigned long)kasan_mem_to_shadow(
>       |                                              ^~~~~~~~~~~~~~~~~~~
>       |                                              kmsan_init_shadow
> 
> Caused by commit
> 
>   15c0b4cb0223 ("ARM: 9427/1: mm: Fix stack recursion caused by KASAN")
> 
> kasan_mem_to_shadow() is only defined when CONFIG_KASAN_GENERIC or
> CONFIG_KASAN_SW_TAGS is set.
> 
> $ grep CONFIG_KASAN arm_multi_v7_defconfig/.config
> # CONFIG_KASAN is not set
> 
> I have used the arm tree from next-20241112 for today.

Also, I note that arch/arm/mm/ioremap.c does not even include linux/kasan.h :-(

-- 
Cheers,
Stephen Rothwell