linux-kernel - Re: next-20250912: riscv: s390: mm/kasan/shadow.c 'kasan_populate_vmalloc_pte' pgtable.h:247:41: error: statement with no effect [-Werror=unused-value]

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Message-ID: <d7a03a2b-d950-4645-80f2-63830bd84f76@redhat.com>
Date: Fri, 12 Sep 2025 13:34:37 +0200
From: David Hildenbrand <david@...hat.com>
To: Naresh Kamboju <naresh.kamboju@...aro.org>,
 kasan-dev <kasan-dev@...glegroups.com>, linux-mm <linux-mm@...ck.org>,
 open list <linux-kernel@...r.kernel.org>,
 linux-riscv <linux-riscv@...ts.infradead.org>, linux-s390@...r.kernel.org,
 lkft-triage@...ts.linaro.org, Linux Regressions
 <regressions@...ts.linux.dev>, Andrew Morton <akpm@...uxfoundation.org>
Cc: Kevin Brodsky <kevin.brodsky@....com>,
 Andrey Ryabinin <ryabinin.a.a@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Dan Carpenter <dan.carpenter@...aro.org>, Arnd Bergmann <arnd@...db.de>,
 Anders Roxell <anders.roxell@...aro.org>,
 Ben Copeland <benjamin.copeland@...aro.org>
Subject: Re: next-20250912: riscv: s390: mm/kasan/shadow.c
 'kasan_populate_vmalloc_pte' pgtable.h:247:41: error: statement with no
 effect [-Werror=unused-value]

On 12.09.25 13:32, Naresh Kamboju wrote:
> The following build warnings / errors noticed on the riscv and s390
> with allyesconfig build on the Linux next-20250912 tag.
> 
> Regression Analysis:
> - New regression? yes
> - Reproducibility? yes
> 
> Build regression: next-20250912 mm/kasan/shadow.c
> 'kasan_populate_vmalloc_pte' pgtable.h error statement with no effect
> [-Werror=unused-value]
> 
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> 
> $ git log --oneline next-20250911..next-20250912 --  mm/kasan/shadow.c
>    aed53ec0b797a mm: introduce local state for lazy_mmu sections
>    307f2dc9b308e kasan: introduce ARCH_DEFER_KASAN and unify static key
> across modes
> 
> ## Test log
> In file included from include/linux/kasan.h:37,
>                   from mm/kasan/shadow.c:14:
> mm/kasan/shadow.c: In function 'kasan_populate_vmalloc_pte':
> include/linux/pgtable.h:247:41: error: statement with no effect
> [-Werror=unused-value]
>    247 | #define arch_enter_lazy_mmu_mode()      (LAZY_MMU_DEFAULT)
>        |                                         ^
> mm/kasan/shadow.c:322:9: note: in expansion of macro 'arch_enter_lazy_mmu_mode'
>    322 |         arch_enter_lazy_mmu_mode();
>        |         ^~~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/shadow.c: In function 'kasan_depopulate_vmalloc_pte':
> include/linux/pgtable.h:247:41: error: statement with no effect
> [-Werror=unused-value]
>    247 | #define arch_enter_lazy_mmu_mode()      (LAZY_MMU_DEFAULT)
>        |                                         ^
> mm/kasan/shadow.c:497:9: note: in expansion of macro 'arch_enter_lazy_mmu_mode'
>    497 |         arch_enter_lazy_mmu_mode();
>        |         ^~~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> 


I'm afraid these changes landed in -mm-unstable a bit too early.


-- 
Cheers

David / dhildenb