linux-kernel - Re: [PATCH v2 0/2] Take ARCH_KMALLOC_MINALIGN into account for build-time XArray check

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Message-ID: <8aa05f08-ef6e-4dfe-9453-beaab7b3cb98@leemhuis.info>
Date: Mon, 18 Aug 2025 13:09:26 +0200
From: Thorsten Leemhuis <linux@...mhuis.info>
To: Alice Ryhl <aliceryhl@...gle.com>, Danilo Krummrich <dakr@...nel.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Matthew Wilcox <willy@...radead.org>, Tamir Duberstein <tamird@...il.com>,
 Andreas Hindborg <a.hindborg@...nel.org>, Miguel Ojeda <ojeda@...nel.org>,
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Benno Lossin <lossin@...nel.org>, Trevor Gross <tmgross@...ch.edu>,
 linux-mm@...ck.org, rust-for-linux@...r.kernel.org,
 linux-kernel@...r.kernel.org, Stephen Rothwell <sfr@...b.auug.org.au>,
 Linux Next Mailing List <linux-next@...r.kernel.org>,
 Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 0/2] Take ARCH_KMALLOC_MINALIGN into account for
 build-time XArray check

On 15.08.25 21:12, Danilo Krummrich wrote:
> On Mon Aug 11, 2025 at 2:31 PM CEST, Alice Ryhl wrote:
>> Alice Ryhl (2):
>>       rust: alloc: specify the minimum alignment of each allocator
> 
>     [ Add helper for ARCH_KMALLOC_MINALIGN; remove cast to usize. - Danilo ]
> 
>>       rust: alloc: take the allocator into account for FOREIGN_ALIGN
> 
> Applied to alloc-next, thanks!

I had a build error with my daily linux-next builds for Fedora (using
the Fedora rawhide config) on arm64 (ppc64le and x86_64 worked fine).
>From a quick look it seems it might be due to this series, which 
turned up in -next today:

"""
error[E0428]: the name `ARCH_KMALLOC_MINALIGN` is defined multiple times
      --> /builddir/build/BUILD/kernel-6.17.0-build/kernel-next-20250818/linux-6.17.0-0.0.next.20250818.423.vanilla.fc44.aarch64/rust/bindings/bindings_generated.rs:134545:1
       |
9622   | pub const ARCH_KMALLOC_MINALIGN: u32 = 8;
       | ----------------------------------------- previous definition of the value `ARCH_KMALLOC_MINALIGN` here
...
134545 | 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

For more information about this error, try `rustc --explain E0428`.
make[2]: *** [rust/Makefile:539: rust/bindings.o] Error 1
make[1]: *** [/builddir/build/BUILD/kernel-6.17.0-build/kernel-next-20250818/linux-6.17.0-0.0.next.20250818.423.vanilla.fc44.aarch64/Makefile:1294: prepare] Error 2
make: *** [Makefile:256: __sub-make] Error 2
"""

Full log:
https://download.copr.fedorainfracloud.org/results/@kernel-vanilla/next/fedora-rawhide-aarch64/09439461-next-next-all/builder-live.log.gz

Ciao, Thorsten