linux-kernel - Re: Mainline loongarch64 defconfig+Rust build error

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Message-ID: <fb77069524eec1df222b2ecbc6ddf5c3b4b041bb.camel@xry111.site>
Date: Tue, 09 Dec 2025 19:28:33 +0800
From: Xi Ruoyao <xry111@...111.site>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Huacai Chen
	 <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>, Alice Ryhl
	 <aliceryhl@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Arve Hjønnevåg
	 <arve@...roid.com>, Todd Kjos <tkjos@...roid.com>, Christian Brauner
	 <christian@...uner.io>, Carlos Llamas <cmllamas@...gle.com>
Cc: Björn Roy Baron <bjorn3_gh@...tonmail.com>, Danilo
 Krummrich <dakr@...nel.org>, Benno Lossin <lossin@...nel.org>, Boqun Feng
 <boqun.feng@...il.com>,  Andreas Hindborg <a.hindborg@...nel.org>, Trevor
 Gross <tmgross@...ch.edu>, loongarch@...ts.linux.dev, rust-for-linux	
 <rust-for-linux@...r.kernel.org>, linux-kernel
 <linux-kernel@...r.kernel.org>
Subject: Re: Mainline loongarch64 defconfig+Rust build error

On Tue, 2025-12-09 at 11:56 +0100, Miguel Ojeda wrote:
> Hi all,
> 
> I am seeing in mainline loongarch64 defconfig+Rust the following build
> error [1].
> 
> Cheers,
> Miguel
> 
> [1]
> 
>  error[E0425]: cannot find value `compat_ptr_ioctl` in crate `bindings`
>      --> drivers/android/binder/rust_binder_main.rs:317:38
>       |
> 317   |         compat_ioctl: Some(bindings::compat_ptr_ioctl),
>       |                                      ^^^^^^^^^^^^^^^^ help: a
> function with a similar name exists: `compat_sys_ioctl`
>       |
>      ::: /__w/quick/quick/linux/rust/bindings/bindings_generated.rs:78264:5
>       |
> 78264 |     pub fn compat_sys_ioctl(fd: ffi::c_uint, cmd: ffi::c_uint,
> arg: compat_ulong_t) -> ffi::c_long;
>       |     ----------------------------------------------------------------------------------------------
> similarly named function `compat_sys_ioctl` defined here

I highly doubt if this is really a LoongArch-only issue.  We have:

#ifdef CONFIG_COMPAT
extern long compat_ptr_ioctl(struct file *file, unsigned int cmd, 
                    unsigned long arg);
#else
#define compat_ptr_ioctl NULL
#endif

AFAIK bindgen does not translate C preprocessor macro definitions, so
when !CONFIG_COMPAT we won't have the Rust binding for it.

And as LA32 is not upstreamed it's pointless to support COMPAT for
LoongArch, yet.

-- 
Xi Ruoyao <xry111@...111.site>