linux-kernel - Re: next-20250911: mm/slub.c:3960:27: error: a function declaration without a prototype is deprecated in all versions of C void flush_all_rcu

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Message-ID: <fa727f7b-92d5-4fd2-b9cf-a19b27303a22@suse.cz>
Date: Thu, 11 Sep 2025 10:45:11 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Naresh Kamboju <naresh.kamboju@...aro.org>,
 open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org,
 Linux Regressions <regressions@...ts.linux.dev>,
 clang-built-linux <llvm@...ts.linux.dev>, linux-mm <linux-mm@...ck.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Nathan Chancellor <nathan@...nel.org>,
 Ben Copeland <benjamin.copeland@...aro.org>, Arnd Bergmann <arnd@...db.de>,
 Dan Carpenter <dan.carpenter@...aro.org>,
 Anders Roxell <anders.roxell@...aro.org>
Subject: Re: next-20250911: mm/slub.c:3960:27: error: a function declaration
 without a prototype is deprecated in all versions of C void
 flush_all_rcu_sheaves()

On 9/11/25 10:37, Naresh Kamboju wrote:
> The following build warnings / errors noticed on aram arm64 defconfig
> with clang-20 and clang-nightly toolchains on the Linux next-20250911 tag.
> 
> Regression Analysis:
> - New regression? yes
> - Reproducibility? yes
> 
> Build regression: next-20250911: mm/slub.c:3960:27: error: a function
> declaration without a prototype is deprecated in all versions of C
> void flush_all_rcu_sheaves()
> 
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> 
> ## Build log
> mm/slub.c:3960:27: error: a function declaration without a prototype
> is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
>  3960 | void flush_all_rcu_sheaves()
>       |                           ^
>       |                            void
> 1 error generated.

Thanks, fixed already for tomorrow's -next
> ## Source
> * Kernel version: 6.17.0-rc5
> * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
> * Git describe: 6.17.0-rc5-next-20250911
> * Git commit: 8f21d9da46702c4d6951ba60ca8a05f42870fe8f
> * Architectures: arm, arm64, i386,  mips, powerpc, riscv, s390
> * Toolchains: clang-20 and clang-nightly
> * clang: Debian clang version 20.1.8
> (++20250809043815+87f0227cb601-1~exp1~20250809163919.3)
> * Kconfigs: defconfig+lkftconfigs
> 
> ## Build
> * Build log: https://qa-reports.linaro.org/api/testruns/29853978/log_file/
> * Build details:
> https://regressions.linaro.org/lkft/linux-next-master/next-20250911/build/clang-20-defconfig/
> * Build plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/builds/32XlFDtH7RdddaA6FHskupLDDSO
> * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/32XlFDtH7RdddaA6FHskupLDDSO/
> * Kernel config:
> https://storage.tuxsuite.com/public/linaro/lkft/builds/32XlFDtH7RdddaA6FHskupLDDSO/config
> * Build log details:
> https://regressions.linaro.org/lkft/linux-next-master/next-20250911/log-parser-build-clang/clang-compiler-mm_slub_c-error-a-function-declaration-without-a-prototype-is-deprecated-in-all-versions-of-c/
> 
> --
> Linaro LKFT
>