When `CONFIG_AUXILIARY_BUS` is disabled, `parent()` is still dead code:

    error: method `parent` is never used
      --> rust/kernel/device.rs:71:19
       |
    64 | impl<Ctx: DeviceContext> Device<Ctx> {
       | ------------------------------------ method in this implementation
    ...
    71 |     pub(crate) fn parent(&self) -> Option<&Self> {
       |                   ^^^^^^
       |
       = note: `-D dead-code` implied by `-D warnings`
       = help: to override `-D warnings` add `#[allow(dead_code)]`

Thus reintroduce the `expect`, but now as a conditional one. Do so as
`dead_code` since that is narrower.

An `allow` would also be possible, but Danilo wants to catch new users
in the future [1].

Link: https://lore.kernel.org/rust-for-linux/aBE8qQrpXOfru_K3@pollux/ [1]
Fixes: ce735e73dd59 ("rust: auxiliary: add auxiliary device / driver abstractions")
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/kernel/device.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
index 40c1f549b0ba..f08583fa39c9 100644
--- a/rust/kernel/device.rs
+++ b/rust/kernel/device.rs
@@ -68,6 +68,7 @@ pub(crate) fn as_raw(&self) -> *mut bindings::device {
     }
 
     /// Returns a reference to the parent device, if any.
+    #[cfg_attr(not(CONFIG_AUXILIARY_BUS), expect(dead_code))]
     pub(crate) fn parent(&self) -> Option<&Self> {
         // SAFETY:
         // - By the type invariant `self.as_raw()` is always valid.

base-commit: ce735e73dd59b169b877cedd0753297c81c2a091
-- 
2.49.0

On Tue, Apr 29, 2025 at 11:06:29PM +0200, Miguel Ojeda wrote:
> When `CONFIG_AUXILIARY_BUS` is disabled, `parent()` is still dead code:
> 
>     error: method `parent` is never used
>       --> rust/kernel/device.rs:71:19
>        |
>     64 | impl<Ctx: DeviceContext> Device<Ctx> {
>        | ------------------------------------ method in this implementation
>     ...
>     71 |     pub(crate) fn parent(&self) -> Option<&Self> {
>        |                   ^^^^^^
>        |
>        = note: `-D dead-code` implied by `-D warnings`
>        = help: to override `-D warnings` add `#[allow(dead_code)]`
> 
> Thus reintroduce the `expect`, but now as a conditional one. Do so as
> `dead_code` since that is narrower.
> 
> An `allow` would also be possible, but Danilo wants to catch new users
> in the future [1].
> 
> Link: https://lore.kernel.org/rust-for-linux/aBE8qQrpXOfru_K3@pollux/ [1]
> Fixes: ce735e73dd59 ("rust: auxiliary: add auxiliary device / driver abstractions")
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Applied to nova-next, thanks!

[ Adjust commit subject to "rust: device: conditionally expect
  `dead_code` for `parent()`". - Danilo ]

On Tue, Apr 29, 2025 at 11:06 PM Miguel Ojeda <ojeda@kernel.org> wrote:
>
> When `CONFIG_AUXILIARY_BUS` is disabled, `parent()` is still dead code:
>
>     error: method `parent` is never used
>       --> rust/kernel/device.rs:71:19
>        |
>     64 | impl<Ctx: DeviceContext> Device<Ctx> {
>        | ------------------------------------ method in this implementation
>     ...
>     71 |     pub(crate) fn parent(&self) -> Option<&Self> {
>        |                   ^^^^^^
>        |
>        = note: `-D dead-code` implied by `-D warnings`
>        = help: to override `-D warnings` add `#[allow(dead_code)]`
>
> Thus reintroduce the `expect`, but now as a conditional one. Do so as
> `dead_code` since that is narrower.
>
> An `allow` would also be possible, but Danilo wants to catch new users
> in the future [1].
>
> Link: https://lore.kernel.org/rust-for-linux/aBE8qQrpXOfru_K3@pollux/ [1]
> Fixes: ce735e73dd59 ("rust: auxiliary: add auxiliary device / driver abstractions")
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Great, I updated this message and somehow broke the title completely
-- please assume it was:

    rust: device: conditionally expect `dead_code` for
`Device<DeviceContext>::parent()`

And, again, please feel free to just `fixup` this patch if preferred.

Cheers,
Miguel