linux-kernel - next-20250818: rust: `ARCH_KMALLOC_MINALIGN` is defined multiple times

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Message-ID: <CA+G9fYv+gELzgcL4y8rOQbTxv2Y2JQTFhNkgUcLbzPJ_yDTziA@mail.gmail.com>
Date: Tue, 19 Aug 2025 14:10:27 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: open list <linux-kernel@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>, rust-for-linux@...r.kernel.org, 
	clang-built-linux <llvm@...ts.linux.dev>
Cc: Miguel Ojeda <ojeda@...nel.org>, wedsonaf@...il.com, Gary Guo <gary@...yguo.net>, 
	Benno Lossin <benno.lossin@...ton.me>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Arnd Bergmann <arnd@...db.de>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Anders Roxell <anders.roxell@...aro.org>, 
	Ben Copeland <benjamin.copeland@...aro.org>
Subject: next-20250818: rust: `ARCH_KMALLOC_MINALIGN` is defined multiple times

Build regressions were detected on multiple architectures (arm, arm64,
riscv) with the Linux next-20250818 tag when building with Rust-enabled
configurations (rust-gcc and rust-clang) from selftests/rust/config.

Duplicate definition of ARCH_KMALLOC_MINALIGN in Rust bindings is
causing build failures across affected toolchains.

First seen on next-20250818
Good: next-20250815
Bad: next-20250818 and next-20250819

Regression Analysis:
- New regression? yes
- Reproducibility? yes

* arm, build
  - rustclang-lkftconfig-kselftest
  - rustgcc-lkftconfig-kselftest

* arm64, build
  - rustclang-lkftconfig-kselftest
  - rustgcc-lkftconfig-kselftest

* riscv, build
  - rustclang-nightly-lkftconfig-kselftest

Boot regression: next-20250818 arm arm64 riscv rust
`ARCH_KMALLOC_MINALIGN` is defined multiple times

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

## Build log
error[E0428]: the name `ARCH_KMALLOC_MINALIGN` is defined multiple times
      --> /home/tuxbuild/.cache/tuxmake/builds/1/build/rust/bindings/bindings_generated.rs:125708:1
       |
5305   | pub const ARCH_KMALLOC_MINALIGN: u32 = 8;
       | ----------------------------------------- previous definition
of the value `ARCH_KMALLOC_MINALIGN` here
...
125708 | pub const ARCH_KMALLOC_MINALIGN: usize = 8;
       | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
`ARCH_KMALLOC_MINALIGN` redefined here
       |
       = note: `ARCH_KMALLOC_MINALIGN` must be defined only once in
the value namespace of this module

error: aborting due to 1 previous error

Please refer the full build log information in the below links.

## Source
* Kernel version: 6.17.0-rc2
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git describe: next-20250818
* Git commit: 3ac864c2d9bb8608ee236e89bf561811613abfce
* Architectures: arm arm64 riscv
* Toolchains: rust-gcc-13, rust-clang-20
* Kconfigs: defconfig+rust

## Build
* Build log: https://qa-reports.linaro.org/api/testruns/29578517/log_file/
* Build details 1:
https://regressions.linaro.org/lkft/linux-next-master/next-20250818/build/rustgcc-lkftconfig-kselftest/
* Build details 2:
https://regressions.linaro.org/lkft/linux-next-master/next-20250818/build/rustclang-lkftconfig-kselftest/
* Build details 3:
https://regressions.linaro.org/lkft/linux-next-master/next-20250818/build/rustclang-nightly-lkftconfig-kselftest/
* Build plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/builds/31RcUoS2AqZLljDCs480MNNEyxJ
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/31RcUoS2AqZLljDCs480MNNEyxJ/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/31RcUoS2AqZLljDCs480MNNEyxJ/config

--
Linaro LKFT
https://lkft.linaro.org