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: <20250912161240.0a5fac78fed5ed8ddc32450a@linux-foundation.org>
Date: Fri, 12 Sep 2025 16:12:40 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: David Hildenbrand <david@...hat.com>
Cc: 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>,
 Kevin Brodsky <kevin.brodsky@....com>, Andrey Ryabinin
 <ryabinin.a.a@...il.com>, 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 Fri, 12 Sep 2025 13:34:37 +0200 David Hildenbrand <david@...hat.com> wrote:

> > [-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.
> 

OK, I'll drop Patch series "Nesting support for lazy MMU mode", v2.