From: Alice Ryhl <aliceryhl@google•com>
To: "Russell King (Oracle)" <linux@armlinux•org.uk>
Cc: Miguel Ojeda <ojeda@kernel•org>,
a.hindborg@kernel•org, acourbot@nvidia•com,
akpm@linux-foundation•org, anton.ivanov@cambridgegreys•com,
bjorn3_gh@protonmail•com, boqun.feng@gmail•com, dakr@kernel•org,
david@davidgow•net, gary@garyguo•net, johannes@sipsolutions•net,
justinstitt@google•com, linux-arm-kernel@lists•infradead.org,
linux-kbuild@vger•kernel.org, linux-kernel@vger•kernel.org,
linux-mm@kvack•org, linux-um@lists•infradead.org,
llvm@lists•linux.dev, lossin@kernel•org, mark.rutland@arm•com,
mmaurer@google•com, morbo@google•com, nathan@kernel•org,
nick.desaulniers+lkml@gmail•com, nicolas.schier@linux•dev,
nsc@kernel•org, peterz@infradead•org, richard@nod•at,
rust-for-linux@vger•kernel.org, tmgross@umich•edu,
urezki@gmail•com, will@kernel•org
Subject: Re: Re: [PATCH v2 0/3] Inline helpers into Rust without full LTO
Date: Thu, 26 Mar 2026 10:10:10 +0000 [thread overview]
Message-ID: <acUGAsjYvNvTEO92@google.com> (raw)
In-Reply-To: <acEP7tl8pqFA3tK8@shell.armlinux.org.uk>
On Mon, Mar 23, 2026 at 10:03:26AM +0000, Russell King (Oracle) wrote:
> On Mon, Mar 23, 2026 at 01:03:27AM +0100, Miguel Ojeda wrote:
> > On Sun, 22 Mar 2026 20:21:59 +0100 Miguel Ojeda <ojeda@kernel•org> wrote:
> > >
> > > On the other hand, regardless of whether we fix this (and another
> > > issue in a separate email found thanks to the UML build), we could
> > > instead add `depends on` listing explicitly the architectures where
> > > this is going to be actually tested. That way maintainers can decide
> > > whether they want to support it when they are ready. Thoughts?
> >
> > Another one for arm 32-bit:
> >
> > LD .tmp_vmlinux1
> > ld.lld: error: undefined symbol: __aeabi_read_tp
> > >>> referenced by uaccess.rs:349 (rust/kernel/uaccess.rs:349)
> > >>> samples/rust/rust_misc_device.o:(<rust_misc_device::RustMiscDevice as kernel::miscdevice::MiscDevice>::ioctl) in archive vmlinux.a
> > >>> referenced by uaccess.rs:543 (rust/kernel/uaccess.rs:543)
> > >>> samples/rust/rust_misc_device.o:(<rust_misc_device::RustMiscDevice as kernel::miscdevice::MiscDevice>::ioctl) in archive vmlinux.a
> > >>> referenced by uaccess.rs:543 (rust/kernel/uaccess.rs:543)
> > >>> drivers/android/binder/rust_binder_main.o:(rust_binder_main::rust_binder_ioctl) in archive vmlinux.a
> > >>> referenced 36 more times
>
> Why is Rust generating code for userspace thread accessors for kernel
> space, where userspace threads are meaningless. This is totally wrong.
> The kernel must not reference __aeabi_read_tp().
>
> Note: I know nothing about Rust, but I know enough to say the above is
> pointing to a fundamental issue in Rust for 32-bit ARM.
I noticed that the Makefile currently uses the arm-unknown-linux-gnueabi
target. It should probably not be -linux target to avoid this? Probably
it should just be armv7a-none-eabi, right? We gate HAVE_RUST on
CPU_32v7, so we should not need to consider the other variants.
Alice
next prev parent reply other threads:[~2026-03-26 10:10 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20260203-inline-helpers-v2-0-beb8547a03c9@google.com>
2026-03-22 19:21 ` [PATCH v2 0/3] Inline helpers into Rust without full LTO Miguel Ojeda
2026-03-22 19:38 ` Miguel Ojeda
2026-03-23 13:54 ` Mark Brown
2026-03-23 14:53 ` Miguel Ojeda
2026-03-22 19:46 ` Miguel Ojeda
2026-03-23 8:49 ` Marek Szyprowski
2026-03-25 1:58 ` Miguel Ojeda
2026-03-26 21:12 ` Arnd Bergmann
2026-03-27 8:02 ` Miguel Ojeda
2026-03-27 8:16 ` Marek Szyprowski
2026-03-23 0:03 ` Miguel Ojeda
2026-03-23 3:04 ` Andrew Lunn
2026-03-23 3:24 ` Miguel Ojeda
2026-03-23 12:54 ` Andrew Lunn
2026-03-23 13:13 ` Gary Guo
2026-03-23 13:28 ` Andrew Lunn
2026-03-23 13:34 ` Miguel Ojeda
2026-03-23 14:39 ` Alice Ryhl
2026-03-23 13:14 ` Miguel Ojeda
2026-03-23 10:03 ` Russell King (Oracle)
2026-03-23 13:26 ` Miguel Ojeda
2026-03-26 10:10 ` Alice Ryhl [this message]
2026-03-26 13:47 ` Miguel Ojeda
2026-03-26 14:31 ` Christian Schrefl
2026-03-26 15:18 ` Russell King (Oracle)
2026-03-26 17:30 ` Miguel Ojeda
2026-03-30 21:09 ` Christian Schrefl
2026-03-31 11:44 ` Arnd Bergmann
2026-03-26 21:33 ` Arnd Bergmann
2026-03-27 7:56 ` Geert Uytterhoeven
2026-03-27 9:02 ` Arnd Bergmann
2026-03-27 13:41 ` Arnd Bergmann
2026-03-30 12:03 ` Geert Uytterhoeven
2026-03-30 12:13 ` Arnd Bergmann
2026-03-30 12:17 ` Geert Uytterhoeven
2026-03-26 17:31 ` Miguel Ojeda
2026-03-26 2:42 ` Nathan Chancellor
2026-03-26 17:13 ` Miguel Ojeda
2026-03-26 5:34 ` David Gow
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