linux-kernel - Re: error[E0560]: struct `bindings::file_operations` has no field named `compat

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Message-ID: <aS1oY_RE06wPmaOR@google.com>
Date: Mon, 1 Dec 2025 10:05:23 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: kernel test robot <lkp@...el.com>, oe-kbuild-all@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: error[E0560]: struct `bindings::file_operations` has no field
 named `compat_ioctl`

On Sun, Nov 30, 2025 at 08:47:52AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   6bda50f4333fa61c07f04f790fdd4e2c9f4ca610
> commit: f893691e742688ae21ad597c5bba13bef54706cd rust: miscdevice: add base miscdevice abstraction
> date:   1 year, 2 months ago
> config: arm64-randconfig-r073-20251130 (https://download.01.org/0day-ci/archive/20251130/202511300859.35d9m0hj-lkp@intel.com/config)
> compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project b3428bb966f1de8aa48375ffee0eba04ede133b7)
> rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251130/202511300859.35d9m0hj-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202511300859.35d9m0hj-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
> >> error[E0560]: struct `bindings::file_operations` has no field named `compat_ioctl`
>    --> rust/kernel/miscdevice.rs:161:13
>        |
>    161 |             compat_ioctl: if T::HAS_COMPAT_IOCTL {
>        |             ^^^^^^^^^^^^ `bindings::file_operations` does not have this field
>        |
>    = note: available fields are: `_address`

Hmm, that's weird.  Use of compat_ioctl in this file is guarded behind
CONFIG_COMPAT, which should be sufficient. And this doesn't seem to just
be another UML failure.

Any ideas?

Alice