linux-kernel - 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: <CA+G9fYtUi3bnZ2zycCot6KGeZcn67JAvz=wZm=6f2w9ZnL=0Uw@mail.gmail.com>
Date: Thu, 11 Sep 2025 14:07:04 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: 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: 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()

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.

## 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