rust: use the build_error! macro, not the hidden function

Code and some examples were using the function, rather than the macro. The
macro is what is documented.

Thus move users to the macro.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20241123222849.350287-1-ojeda@kernel.org
[ Applied the change to the new miscdevice cases. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

rust/kernel/block/mq/operations.rs

@@ -35,7 +35,7 @@ pub trait Operations: Sized {
     /// Called by the kernel to poll the device for completed requests. Only
     /// used for poll queues.
     fn poll() -> bool {
-        crate::build_error(crate::error::VTABLE_DEFAULT_ERROR)
+        crate::build_error!(crate::error::VTABLE_DEFAULT_ERROR)
     }
 }
 

rust/kernel/miscdevice.rs

@@ -116,7 +116,7 @@ pub trait MiscDevice {
         _cmd: u32,
         _arg: usize,
     ) -> Result<isize> {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 
     /// Handler for ioctls.
@@ -132,7 +132,7 @@ pub trait MiscDevice {
         _cmd: u32,
         _arg: usize,
     ) -> Result<isize> {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 }
 

rust/kernel/net/phy.rs

@@ -587,17 +587,17 @@ pub trait Driver {
 
     /// Issues a PHY software reset.
     fn soft_reset(_dev: &mut Device) -> Result {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 
     /// Sets up device-specific structures during discovery.
     fn probe(_dev: &mut Device) -> Result {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 
     /// Probes the hardware to determine what abilities it has.
     fn get_features(_dev: &mut Device) -> Result {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 
     /// Returns true if this is a suitable driver for the given phydev.
@@ -609,32 +609,32 @@ pub trait Driver {
     /// Configures the advertisement and resets auto-negotiation
     /// if auto-negotiation is enabled.
     fn config_aneg(_dev: &mut Device) -> Result {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 
     /// Determines the negotiated speed and duplex.
     fn read_status(_dev: &mut Device) -> Result<u16> {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 
     /// Suspends the hardware, saving state if needed.
     fn suspend(_dev: &mut Device) -> Result {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 
     /// Resumes the hardware, restoring state if needed.
     fn resume(_dev: &mut Device) -> Result {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 
     /// Overrides the default MMD read function for reading a MMD register.
     fn read_mmd(_dev: &mut Device, _devnum: u8, _regnum: u16) -> Result<u16> {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 
     /// Overrides the default MMD write function for writing a MMD register.
     fn write_mmd(_dev: &mut Device, _devnum: u8, _regnum: u16, _val: u16) -> Result {
-        kernel::build_error(VTABLE_DEFAULT_ERROR)
+        kernel::build_error!(VTABLE_DEFAULT_ERROR)
     }
 
     /// Callback for notification of link change.

rust/macros/lib.rs

@@ -123,12 +123,12 @@ pub fn module(ts: TokenStream) -> TokenStream {
 /// used on the Rust side, it should not be possible to call the default
 /// implementation. This is done to ensure that we call the vtable methods
 /// through the C vtable, and not through the Rust vtable. Therefore, the
-/// default implementation should call `kernel::build_error`, which prevents
+/// default implementation should call `kernel::build_error!`, which prevents
 /// calls to this function at compile time:
 ///
 /// ```compile_fail
 /// # // Intentionally missing `use`s to simplify `rusttest`.
-/// kernel::build_error(VTABLE_DEFAULT_ERROR)
+/// kernel::build_error!(VTABLE_DEFAULT_ERROR)
 /// ```
 ///
 /// Note that you might need to import [`kernel::error::VTABLE_DEFAULT_ERROR`].
@@ -145,11 +145,11 @@ pub fn module(ts: TokenStream) -> TokenStream {
 /// #[vtable]
 /// pub trait Operations: Send + Sync + Sized {
 ///     fn foo(&self) -> Result<()> {
-///         kernel::build_error(VTABLE_DEFAULT_ERROR)
+///         kernel::build_error!(VTABLE_DEFAULT_ERROR)
 ///     }
 ///
 ///     fn bar(&self) -> Result<()> {
-///         kernel::build_error(VTABLE_DEFAULT_ERROR)
+///         kernel::build_error!(VTABLE_DEFAULT_ERROR)
 ///     }
 /// }
 ///