rust/macros/lib.rs - linux/kernel/git/gregkh/tty - Git at Google

 // SPDX-License-Identifier: GPL-2.0

 //! Crate for all kernel procedural macros.

 // When fixdep scans this, it will find this string `CONFIG_RUSTC_VERSION_TEXT`
 // and thus add a dependency on `include/config/RUSTC_VERSION_TEXT`, which is
 // touched by Kconfig when the version string from the compiler changes.

 // Stable since Rust 1.88.0 under a different name, `proc_macro_span_file`,
 // which was added in Rust 1.88.0. This is why `cfg_attr` is used here, i.e.
 // to avoid depending on the full `proc_macro_span` on Rust >= 1.88.0.
 #![cfg_attr(not(CONFIG_RUSTC_HAS_SPAN_FILE), feature(proc_macro_span))]

 #[macro_use]
 mod quote;
 mod concat_idents;
 mod export;
 mod helpers;
 mod kunit;
 mod module;
 mod paste;
 mod vtable;

 use proc_macro::TokenStream;

 /// Declares a kernel module.
 ///
 /// The `type` argument should be a type which implements the [`Module`]
 /// trait. Also accepts various forms of kernel metadata.
 ///
 /// C header: [`include/linux/moduleparam.h`](srctree/include/linux/moduleparam.h)
 ///
 /// [`Module`]: ../kernel/trait.Module.html
 ///
 /// # Examples
 ///
 /// ```
 /// use kernel::prelude::*;
 ///
 /// module!{
 ///     type: MyModule,
 ///     name: "my_kernel_module",
 ///     authors: ["Rust for Linux Contributors"],
 ///     description: "My very own kernel module!",
 ///     license: "GPL",
 ///     alias: ["alternate_module_name"],
 /// }
 ///
 /// struct MyModule(i32);
 ///
 /// impl kernel::Module for MyModule {
 ///     fn init(_module: &'static ThisModule) -> Result<Self> {
 ///         let foo: i32 = 42;
 ///         pr_info!("I contain:  {}\n", foo);
 ///         Ok(Self(foo))
 ///     }
 /// }
 /// # fn main() {}
 /// ```
 ///
 /// ## Firmware
 ///
 /// The following example shows how to declare a kernel module that needs
 /// to load binary firmware files. You need to specify the file names of
 /// the firmware in the `firmware` field. The information is embedded
 /// in the `modinfo` section of the kernel module. For example, a tool to
 /// build an initramfs uses this information to put the firmware files into
 /// the initramfs image.
 ///
 /// ```
 /// use kernel::prelude::*;
 ///
 /// module!{
 ///     type: MyDeviceDriverModule,
 ///     name: "my_device_driver_module",
 ///     authors: ["Rust for Linux Contributors"],
 ///     description: "My device driver requires firmware",
 ///     license: "GPL",
 ///     firmware: ["my_device_firmware1.bin", "my_device_firmware2.bin"],
 /// }
 ///
 /// struct MyDeviceDriverModule;
 ///
 /// impl kernel::Module for MyDeviceDriverModule {
 ///     fn init(_module: &'static ThisModule) -> Result<Self> {
 ///         Ok(Self)
 ///     }
 /// }
 /// # fn main() {}
 /// ```
 ///
 /// # Supported argument types
 ///   - `type`: type which implements the [`Module`] trait (required).
 ///   - `name`: ASCII string literal of the name of the kernel module (required).
 ///   - `authors`: array of ASCII string literals of the authors of the kernel module.
 ///   - `description`: string literal of the description of the kernel module.
 ///   - `license`: ASCII string literal of the license of the kernel module (required).
 ///   - `alias`: array of ASCII string literals of the alias names of the kernel module.
 ///   - `firmware`: array of ASCII string literals of the firmware files of
 ///     the kernel module.
 #[proc_macro]
 pub fn module(ts: TokenStream) -> TokenStream {
     module::module(ts)
 }

 /// Declares or implements a vtable trait.
 ///
 /// Linux's use of pure vtables is very close to Rust traits, but they differ
 /// in how unimplemented functions are represented. In Rust, traits can provide
 /// default implementation for all non-required methods (and the default
 /// implementation could just return `Error::EINVAL`); Linux typically use C
 /// `NULL` pointers to represent these functions.
 ///
 /// This attribute closes that gap. A trait can be annotated with the
 /// `#[vtable]` attribute. Implementers of the trait will then also have to
 /// annotate the trait with `#[vtable]`. This attribute generates a `HAS_*`
 /// associated constant bool for each method in the trait that is set to true if
 /// the implementer has overridden the associated method.
 ///
 /// For a trait method to be optional, it must have a default implementation.
 /// This is also the case for traits annotated with `#[vtable]`, but in this
 /// case the default implementation will never be executed. The reason for this
 /// is that the functions will be called through function pointers installed in
 /// C side vtables. When an optional method is not implemented on a `#[vtable]`
 /// trait, a NULL entry is installed in the vtable. Thus the default
 /// implementation is never called. Since these traits are not designed to be
 /// 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 `build_error!`, which prevents
 /// calls to this function at compile time:
 ///
 /// ```compile_fail
 /// # // Intentionally missing `use`s to simplify `rusttest`.
 /// build_error!(VTABLE_DEFAULT_ERROR)
 /// ```
 ///
 /// Note that you might need to import [`kernel::error::VTABLE_DEFAULT_ERROR`].
 ///
 /// This macro should not be used when all functions are required.
 ///
 /// # Examples
 ///
 /// ```
 /// use kernel::error::VTABLE_DEFAULT_ERROR;
 /// use kernel::prelude::*;
 ///
 /// // Declares a `#[vtable]` trait
 /// #[vtable]
 /// pub trait Operations: Send + Sync + Sized {
 ///     fn foo(&self) -> Result<()> {
 ///         build_error!(VTABLE_DEFAULT_ERROR)
 ///     }
 ///
 ///     fn bar(&self) -> Result<()> {
 ///         build_error!(VTABLE_DEFAULT_ERROR)
 ///     }
 /// }
 ///
 /// struct Foo;
 ///
 /// // Implements the `#[vtable]` trait
 /// #[vtable]
 /// impl Operations for Foo {
 ///     fn foo(&self) -> Result<()> {
 /// #        Err(EINVAL)
 ///         // ...
 ///     }
 /// }
 ///
 /// assert_eq!(<Foo as Operations>::HAS_FOO, true);
 /// assert_eq!(<Foo as Operations>::HAS_BAR, false);
 /// ```
 ///
 /// [`kernel::error::VTABLE_DEFAULT_ERROR`]: ../kernel/error/constant.VTABLE_DEFAULT_ERROR.html
 #[proc_macro_attribute]
 pub fn vtable(attr: TokenStream, ts: TokenStream) -> TokenStream {
     vtable::vtable(attr, ts)
 }

 /// Export a function so that C code can call it via a header file.
 ///
 /// Functions exported using this macro can be called from C code using the declaration in the
 /// appropriate header file. It should only be used in cases where C calls the function through a
 /// header file; cases where C calls into Rust via a function pointer in a vtable (such as
 /// `file_operations`) should not use this macro.
 ///
 /// This macro has the following effect:
 ///
 /// * Disables name mangling for this function.
 /// * Verifies at compile-time that the function signature matches the declaration in the header
 ///   file.
 ///
 /// You must declare the signature of the Rust function in a header file that is included by
 /// `rust/bindings/bindings_helper.h`.
 ///
 /// This macro is *not* the same as the C macros `EXPORT_SYMBOL_*`. All Rust symbols are currently
 /// automatically exported with `EXPORT_SYMBOL_GPL`.
 #[proc_macro_attribute]
 pub fn export(attr: TokenStream, ts: TokenStream) -> TokenStream {
     export::export(attr, ts)
 }

 /// Concatenate two identifiers.
 ///
 /// This is useful in macros that need to declare or reference items with names
 /// starting with a fixed prefix and ending in a user specified name. The resulting
 /// identifier has the span of the second argument.
 ///
 /// # Examples
 ///
 /// ```
 /// # const binder_driver_return_protocol_BR_OK: u32 = 0;
 /// # const binder_driver_return_protocol_BR_ERROR: u32 = 1;
 /// # const binder_driver_return_protocol_BR_TRANSACTION: u32 = 2;
 /// # const binder_driver_return_protocol_BR_REPLY: u32 = 3;
 /// # const binder_driver_return_protocol_BR_DEAD_REPLY: u32 = 4;
 /// # const binder_driver_return_protocol_BR_TRANSACTION_COMPLETE: u32 = 5;
 /// # const binder_driver_return_protocol_BR_INCREFS: u32 = 6;
 /// # const binder_driver_return_protocol_BR_ACQUIRE: u32 = 7;
 /// # const binder_driver_return_protocol_BR_RELEASE: u32 = 8;
 /// # const binder_driver_return_protocol_BR_DECREFS: u32 = 9;
 /// # const binder_driver_return_protocol_BR_NOOP: u32 = 10;
 /// # const binder_driver_return_protocol_BR_SPAWN_LOOPER: u32 = 11;
 /// # const binder_driver_return_protocol_BR_DEAD_BINDER: u32 = 12;
 /// # const binder_driver_return_protocol_BR_CLEAR_DEATH_NOTIFICATION_DONE: u32 = 13;
 /// # const binder_driver_return_protocol_BR_FAILED_REPLY: u32 = 14;
 /// use kernel::macros::concat_idents;
 ///
 /// macro_rules! pub_no_prefix {
 ///     ($prefix:ident, $($newname:ident),+) => {
 ///         $(pub(crate) const $newname: u32 = concat_idents!($prefix, $newname);)+
 ///     };
 /// }
 ///
 /// pub_no_prefix!(
 ///     binder_driver_return_protocol_,
 ///     BR_OK,
 ///     BR_ERROR,
 ///     BR_TRANSACTION,
 ///     BR_REPLY,
 ///     BR_DEAD_REPLY,
 ///     BR_TRANSACTION_COMPLETE,
 ///     BR_INCREFS,
 ///     BR_ACQUIRE,
 ///     BR_RELEASE,
 ///     BR_DECREFS,
 ///     BR_NOOP,
 ///     BR_SPAWN_LOOPER,
 ///     BR_DEAD_BINDER,
 ///     BR_CLEAR_DEATH_NOTIFICATION_DONE,
 ///     BR_FAILED_REPLY
 /// );
 ///
 /// assert_eq!(BR_OK, binder_driver_return_protocol_BR_OK);
 /// ```
 #[proc_macro]
 pub fn concat_idents(ts: TokenStream) -> TokenStream {
     concat_idents::concat_idents(ts)
 }

 /// Paste identifiers together.
 ///
 /// Within the `paste!` macro, identifiers inside `[<` and `>]` are concatenated together to form a
 /// single identifier.
 ///
 /// This is similar to the [`paste`] crate, but with pasting feature limited to identifiers and
 /// literals (lifetimes and documentation strings are not supported). There is a difference in
 /// supported modifiers as well.
 ///
 /// # Examples
 ///
 /// ```
 /// # const binder_driver_return_protocol_BR_OK: u32 = 0;
 /// # const binder_driver_return_protocol_BR_ERROR: u32 = 1;
 /// # const binder_driver_return_protocol_BR_TRANSACTION: u32 = 2;
 /// # const binder_driver_return_protocol_BR_REPLY: u32 = 3;
 /// # const binder_driver_return_protocol_BR_DEAD_REPLY: u32 = 4;
 /// # const binder_driver_return_protocol_BR_TRANSACTION_COMPLETE: u32 = 5;
 /// # const binder_driver_return_protocol_BR_INCREFS: u32 = 6;
 /// # const binder_driver_return_protocol_BR_ACQUIRE: u32 = 7;
 /// # const binder_driver_return_protocol_BR_RELEASE: u32 = 8;
 /// # const binder_driver_return_protocol_BR_DECREFS: u32 = 9;
 /// # const binder_driver_return_protocol_BR_NOOP: u32 = 10;
 /// # const binder_driver_return_protocol_BR_SPAWN_LOOPER: u32 = 11;
 /// # const binder_driver_return_protocol_BR_DEAD_BINDER: u32 = 12;
 /// # const binder_driver_return_protocol_BR_CLEAR_DEATH_NOTIFICATION_DONE: u32 = 13;
 /// # const binder_driver_return_protocol_BR_FAILED_REPLY: u32 = 14;
 /// macro_rules! pub_no_prefix {
 ///     ($prefix:ident, $($newname:ident),+) => {
 ///         ::kernel::macros::paste! {
 ///             $(pub(crate) const $newname: u32 = [<$prefix $newname>];)+
 ///         }
 ///     };
 /// }
 ///
 /// pub_no_prefix!(
 ///     binder_driver_return_protocol_,
 ///     BR_OK,
 ///     BR_ERROR,
 ///     BR_TRANSACTION,
 ///     BR_REPLY,
 ///     BR_DEAD_REPLY,
 ///     BR_TRANSACTION_COMPLETE,
 ///     BR_INCREFS,
 ///     BR_ACQUIRE,
 ///     BR_RELEASE,
 ///     BR_DECREFS,
 ///     BR_NOOP,
 ///     BR_SPAWN_LOOPER,
 ///     BR_DEAD_BINDER,
 ///     BR_CLEAR_DEATH_NOTIFICATION_DONE,
 ///     BR_FAILED_REPLY
 /// );
 ///
 /// assert_eq!(BR_OK, binder_driver_return_protocol_BR_OK);
 /// ```
 ///
 /// # Modifiers
 ///
 /// For each identifier, it is possible to attach one or multiple modifiers to
 /// it.
 ///
 /// Currently supported modifiers are:
 /// * `span`: change the span of concatenated identifier to the span of the specified token. By
 ///   default the span of the `[< >]` group is used.
 /// * `lower`: change the identifier to lower case.
 /// * `upper`: change the identifier to upper case.
 ///
 /// ```
 /// # const binder_driver_return_protocol_BR_OK: u32 = 0;
 /// # const binder_driver_return_protocol_BR_ERROR: u32 = 1;
 /// # const binder_driver_return_protocol_BR_TRANSACTION: u32 = 2;
 /// # const binder_driver_return_protocol_BR_REPLY: u32 = 3;
 /// # const binder_driver_return_protocol_BR_DEAD_REPLY: u32 = 4;
 /// # const binder_driver_return_protocol_BR_TRANSACTION_COMPLETE: u32 = 5;
 /// # const binder_driver_return_protocol_BR_INCREFS: u32 = 6;
 /// # const binder_driver_return_protocol_BR_ACQUIRE: u32 = 7;
 /// # const binder_driver_return_protocol_BR_RELEASE: u32 = 8;
 /// # const binder_driver_return_protocol_BR_DECREFS: u32 = 9;
 /// # const binder_driver_return_protocol_BR_NOOP: u32 = 10;
 /// # const binder_driver_return_protocol_BR_SPAWN_LOOPER: u32 = 11;
 /// # const binder_driver_return_protocol_BR_DEAD_BINDER: u32 = 12;
 /// # const binder_driver_return_protocol_BR_CLEAR_DEATH_NOTIFICATION_DONE: u32 = 13;
 /// # const binder_driver_return_protocol_BR_FAILED_REPLY: u32 = 14;
 /// macro_rules! pub_no_prefix {
 ///     ($prefix:ident, $($newname:ident),+) => {
 ///         ::kernel::macros::paste! {
 ///             $(pub(crate) const fn [<$newname:lower:span>]() -> u32 { [<$prefix $newname:span>] })+
 ///         }
 ///     };
 /// }
 ///
 /// pub_no_prefix!(
 ///     binder_driver_return_protocol_,
 ///     BR_OK,
 ///     BR_ERROR,
 ///     BR_TRANSACTION,
 ///     BR_REPLY,
 ///     BR_DEAD_REPLY,
 ///     BR_TRANSACTION_COMPLETE,
 ///     BR_INCREFS,
 ///     BR_ACQUIRE,
 ///     BR_RELEASE,
 ///     BR_DECREFS,
 ///     BR_NOOP,
 ///     BR_SPAWN_LOOPER,
 ///     BR_DEAD_BINDER,
 ///     BR_CLEAR_DEATH_NOTIFICATION_DONE,
 ///     BR_FAILED_REPLY
 /// );
 ///
 /// assert_eq!(br_ok(), binder_driver_return_protocol_BR_OK);
 /// ```
 ///
 /// # Literals
 ///
 /// Literals can also be concatenated with other identifiers:
 ///
 /// ```
 /// macro_rules! create_numbered_fn {
 ///     ($name:literal, $val:literal) => {
 ///         ::kernel::macros::paste! {
 ///             fn [<some_ $name _fn $val>]() -> u32 { $val }
 ///         }
 ///     };
 /// }
 ///
 /// create_numbered_fn!("foo", 100);
 ///
 /// assert_eq!(some_foo_fn100(), 100)
 /// ```
 ///
 /// [`paste`]: https://docs.rs/paste/
 #[proc_macro]
 pub fn paste(input: TokenStream) -> TokenStream {
     let mut tokens = input.into_iter().collect();
     paste::expand(&mut tokens);
     tokens.into_iter().collect()
 }

 /// Registers a KUnit test suite and its test cases using a user-space like syntax.
 ///
 /// This macro should be used on modules. If `CONFIG_KUNIT` (in `.config`) is `n`, the target module
 /// is ignored.
 ///
 /// # Examples
 ///
 /// ```ignore
 /// # use kernel::prelude::*;
 /// #[kunit_tests(kunit_test_suit_name)]
 /// mod tests {
 ///     #[test]
 ///     fn foo() {
 ///         assert_eq!(1, 1);
 ///     }
 ///
 ///     #[test]
 ///     fn bar() {
 ///         assert_eq!(2, 2);
 ///     }
 /// }
 /// ```
 #[proc_macro_attribute]
 pub fn kunit_tests(attr: TokenStream, ts: TokenStream) -> TokenStream {
     kunit::kunit_tests(attr, ts)
 }
	// SPDX-License-Identifier: GPL-2.0

	//! Crate for all kernel procedural macros.

	// When fixdep scans this, it will find this string `CONFIG_RUSTC_VERSION_TEXT`
	// and thus add a dependency on `include/config/RUSTC_VERSION_TEXT`, which is
	// touched by Kconfig when the version string from the compiler changes.

	// Stable since Rust 1.88.0 under a different name, `proc_macro_span_file`,
	// which was added in Rust 1.88.0. This is why `cfg_attr` is used here, i.e.
	// to avoid depending on the full `proc_macro_span` on Rust >= 1.88.0.
	#![cfg_attr(not(CONFIG_RUSTC_HAS_SPAN_FILE), feature(proc_macro_span))]

	#[macro_use]
	mod quote;
	mod concat_idents;
	mod export;
	mod helpers;
	mod kunit;
	mod module;
	mod paste;
	mod vtable;

	use proc_macro::TokenStream;

	/// Declares a kernel module.
	///
	/// The `type` argument should be a type which implements the [`Module`]
	/// trait. Also accepts various forms of kernel metadata.
	///
	/// C header: [`include/linux/moduleparam.h`](srctree/include/linux/moduleparam.h)
	///
	/// [`Module`]: ../kernel/trait.Module.html
	///
	/// # Examples
	///
	/// ```
	/// use kernel::prelude::*;
	///
	/// module!{
	/// type: MyModule,
	/// name: "my_kernel_module",
	/// authors: ["Rust for Linux Contributors"],
	/// description: "My very own kernel module!",
	/// license: "GPL",
	/// alias: ["alternate_module_name"],
	/// }
	///
	/// struct MyModule(i32);
	///
	/// impl kernel::Module for MyModule {
	/// fn init(_module: &'static ThisModule) -> Result<Self> {
	/// let foo: i32 = 42;
	/// pr_info!("I contain: {}\n", foo);
	/// Ok(Self(foo))
	/// }
	/// }
	/// # fn main() {}
	/// ```
	///
	/// ## Firmware
	///
	/// The following example shows how to declare a kernel module that needs
	/// to load binary firmware files. You need to specify the file names of
	/// the firmware in the `firmware` field. The information is embedded
	/// in the `modinfo` section of the kernel module. For example, a tool to
	/// build an initramfs uses this information to put the firmware files into
	/// the initramfs image.
	///
	/// ```
	/// use kernel::prelude::*;
	///
	/// module!{
	/// type: MyDeviceDriverModule,
	/// name: "my_device_driver_module",
	/// authors: ["Rust for Linux Contributors"],
	/// description: "My device driver requires firmware",
	/// license: "GPL",
	/// firmware: ["my_device_firmware1.bin", "my_device_firmware2.bin"],
	/// }
	///
	/// struct MyDeviceDriverModule;
	///
	/// impl kernel::Module for MyDeviceDriverModule {
	/// fn init(_module: &'static ThisModule) -> Result<Self> {
	/// Ok(Self)
	/// }
	/// }
	/// # fn main() {}
	/// ```
	///
	/// # Supported argument types
	/// - `type`: type which implements the [`Module`] trait (required).
	/// - `name`: ASCII string literal of the name of the kernel module (required).
	/// - `authors`: array of ASCII string literals of the authors of the kernel module.
	/// - `description`: string literal of the description of the kernel module.
	/// - `license`: ASCII string literal of the license of the kernel module (required).
	/// - `alias`: array of ASCII string literals of the alias names of the kernel module.
	/// - `firmware`: array of ASCII string literals of the firmware files of
	/// the kernel module.
	#[proc_macro]
	pub fn module(ts: TokenStream) -> TokenStream {
	module::module(ts)
	}

	/// Declares or implements a vtable trait.
	///
	/// Linux's use of pure vtables is very close to Rust traits, but they differ
	/// in how unimplemented functions are represented. In Rust, traits can provide
	/// default implementation for all non-required methods (and the default
	/// implementation could just return `Error::EINVAL`); Linux typically use C
	/// `NULL` pointers to represent these functions.
	///
	/// This attribute closes that gap. A trait can be annotated with the
	/// `#[vtable]` attribute. Implementers of the trait will then also have to
	/// annotate the trait with `#[vtable]`. This attribute generates a `HAS_*`
	/// associated constant bool for each method in the trait that is set to true if
	/// the implementer has overridden the associated method.
	///
	/// For a trait method to be optional, it must have a default implementation.
	/// This is also the case for traits annotated with `#[vtable]`, but in this
	/// case the default implementation will never be executed. The reason for this
	/// is that the functions will be called through function pointers installed in
	/// C side vtables. When an optional method is not implemented on a `#[vtable]`
	/// trait, a NULL entry is installed in the vtable. Thus the default
	/// implementation is never called. Since these traits are not designed to be
	/// 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 `build_error!`, which prevents
	/// calls to this function at compile time:
	///
	/// ```compile_fail
	/// # // Intentionally missing `use`s to simplify `rusttest`.
	/// build_error!(VTABLE_DEFAULT_ERROR)
	/// ```
	///
	/// Note that you might need to import [`kernel::error::VTABLE_DEFAULT_ERROR`].
	///
	/// This macro should not be used when all functions are required.
	///
	/// # Examples
	///
	/// ```
	/// use kernel::error::VTABLE_DEFAULT_ERROR;
	/// use kernel::prelude::*;
	///
	/// // Declares a `#[vtable]` trait
	/// #[vtable]
	/// pub trait Operations: Send + Sync + Sized {
	/// fn foo(&self) -> Result<()> {
	/// build_error!(VTABLE_DEFAULT_ERROR)
	/// }
	///
	/// fn bar(&self) -> Result<()> {
	/// build_error!(VTABLE_DEFAULT_ERROR)
	/// }
	/// }
	///
	/// struct Foo;
	///
	/// // Implements the `#[vtable]` trait
	/// #[vtable]
	/// impl Operations for Foo {
	/// fn foo(&self) -> Result<()> {
	/// # Err(EINVAL)
	/// // ...
	/// }
	/// }
	///
	/// assert_eq!(<Foo as Operations>::HAS_FOO, true);
	/// assert_eq!(<Foo as Operations>::HAS_BAR, false);
	/// ```
	///
	/// [`kernel::error::VTABLE_DEFAULT_ERROR`]: ../kernel/error/constant.VTABLE_DEFAULT_ERROR.html
	#[proc_macro_attribute]
	pub fn vtable(attr: TokenStream, ts: TokenStream) -> TokenStream {
	vtable::vtable(attr, ts)
	}

	/// Export a function so that C code can call it via a header file.
	///
	/// Functions exported using this macro can be called from C code using the declaration in the
	/// appropriate header file. It should only be used in cases where C calls the function through a
	/// header file; cases where C calls into Rust via a function pointer in a vtable (such as
	/// `file_operations`) should not use this macro.
	///
	/// This macro has the following effect:
	///
	/// * Disables name mangling for this function.
	/// * Verifies at compile-time that the function signature matches the declaration in the header
	/// file.
	///
	/// You must declare the signature of the Rust function in a header file that is included by
	/// `rust/bindings/bindings_helper.h`.
	///
	/// This macro is not the same as the C macros `EXPORT_SYMBOL_*`. All Rust symbols are currently
	/// automatically exported with `EXPORT_SYMBOL_GPL`.
	#[proc_macro_attribute]
	pub fn export(attr: TokenStream, ts: TokenStream) -> TokenStream {
	export::export(attr, ts)
	}

	/// Concatenate two identifiers.
	///
	/// This is useful in macros that need to declare or reference items with names
	/// starting with a fixed prefix and ending in a user specified name. The resulting
	/// identifier has the span of the second argument.
	///
	/// # Examples
	///
	/// ```
	/// # const binder_driver_return_protocol_BR_OK: u32 = 0;
	/// # const binder_driver_return_protocol_BR_ERROR: u32 = 1;
	/// # const binder_driver_return_protocol_BR_TRANSACTION: u32 = 2;
	/// # const binder_driver_return_protocol_BR_REPLY: u32 = 3;
	/// # const binder_driver_return_protocol_BR_DEAD_REPLY: u32 = 4;
	/// # const binder_driver_return_protocol_BR_TRANSACTION_COMPLETE: u32 = 5;
	/// # const binder_driver_return_protocol_BR_INCREFS: u32 = 6;
	/// # const binder_driver_return_protocol_BR_ACQUIRE: u32 = 7;
	/// # const binder_driver_return_protocol_BR_RELEASE: u32 = 8;
	/// # const binder_driver_return_protocol_BR_DECREFS: u32 = 9;
	/// # const binder_driver_return_protocol_BR_NOOP: u32 = 10;
	/// # const binder_driver_return_protocol_BR_SPAWN_LOOPER: u32 = 11;
	/// # const binder_driver_return_protocol_BR_DEAD_BINDER: u32 = 12;
	/// # const binder_driver_return_protocol_BR_CLEAR_DEATH_NOTIFICATION_DONE: u32 = 13;
	/// # const binder_driver_return_protocol_BR_FAILED_REPLY: u32 = 14;
	/// use kernel::macros::concat_idents;
	///
	/// macro_rules! pub_no_prefix {
	/// ($prefix:ident, $($newname:ident),+) => {
	/// $(pub(crate) const $newname: u32 = concat_idents!($prefix, $newname);)+
	/// };
	/// }
	///
	/// pub_no_prefix!(
	/// binder_driver_return_protocol_,
	/// BR_OK,
	/// BR_ERROR,
	/// BR_TRANSACTION,
	/// BR_REPLY,
	/// BR_DEAD_REPLY,
	/// BR_TRANSACTION_COMPLETE,
	/// BR_INCREFS,
	/// BR_ACQUIRE,
	/// BR_RELEASE,
	/// BR_DECREFS,
	/// BR_NOOP,
	/// BR_SPAWN_LOOPER,
	/// BR_DEAD_BINDER,
	/// BR_CLEAR_DEATH_NOTIFICATION_DONE,
	/// BR_FAILED_REPLY
	/// );
	///
	/// assert_eq!(BR_OK, binder_driver_return_protocol_BR_OK);
	/// ```
	#[proc_macro]
	pub fn concat_idents(ts: TokenStream) -> TokenStream {
	concat_idents::concat_idents(ts)
	}

	/// Paste identifiers together.
	///
	/// Within the `paste!` macro, identifiers inside `[<` and `>]` are concatenated together to form a
	/// single identifier.
	///
	/// This is similar to the [`paste`] crate, but with pasting feature limited to identifiers and
	/// literals (lifetimes and documentation strings are not supported). There is a difference in
	/// supported modifiers as well.
	///
	/// # Examples
	///
	/// ```
	/// # const binder_driver_return_protocol_BR_OK: u32 = 0;
	/// # const binder_driver_return_protocol_BR_ERROR: u32 = 1;
	/// # const binder_driver_return_protocol_BR_TRANSACTION: u32 = 2;
	/// # const binder_driver_return_protocol_BR_REPLY: u32 = 3;
	/// # const binder_driver_return_protocol_BR_DEAD_REPLY: u32 = 4;
	/// # const binder_driver_return_protocol_BR_TRANSACTION_COMPLETE: u32 = 5;
	/// # const binder_driver_return_protocol_BR_INCREFS: u32 = 6;
	/// # const binder_driver_return_protocol_BR_ACQUIRE: u32 = 7;
	/// # const binder_driver_return_protocol_BR_RELEASE: u32 = 8;
	/// # const binder_driver_return_protocol_BR_DECREFS: u32 = 9;
	/// # const binder_driver_return_protocol_BR_NOOP: u32 = 10;
	/// # const binder_driver_return_protocol_BR_SPAWN_LOOPER: u32 = 11;
	/// # const binder_driver_return_protocol_BR_DEAD_BINDER: u32 = 12;
	/// # const binder_driver_return_protocol_BR_CLEAR_DEATH_NOTIFICATION_DONE: u32 = 13;
	/// # const binder_driver_return_protocol_BR_FAILED_REPLY: u32 = 14;
	/// macro_rules! pub_no_prefix {
	/// ($prefix:ident, $($newname:ident),+) => {
	/// ::kernel::macros::paste! {
	/// $(pub(crate) const $newname: u32 = [<$prefix $newname>];)+
	/// }
	/// };
	/// }
	///
	/// pub_no_prefix!(
	/// binder_driver_return_protocol_,
	/// BR_OK,
	/// BR_ERROR,
	/// BR_TRANSACTION,
	/// BR_REPLY,
	/// BR_DEAD_REPLY,
	/// BR_TRANSACTION_COMPLETE,
	/// BR_INCREFS,
	/// BR_ACQUIRE,
	/// BR_RELEASE,
	/// BR_DECREFS,
	/// BR_NOOP,
	/// BR_SPAWN_LOOPER,
	/// BR_DEAD_BINDER,
	/// BR_CLEAR_DEATH_NOTIFICATION_DONE,
	/// BR_FAILED_REPLY
	/// );
	///
	/// assert_eq!(BR_OK, binder_driver_return_protocol_BR_OK);
	/// ```
	///
	/// # Modifiers
	///
	/// For each identifier, it is possible to attach one or multiple modifiers to
	/// it.
	///
	/// Currently supported modifiers are:
	/// * `span`: change the span of concatenated identifier to the span of the specified token. By
	/// default the span of the `[< >]` group is used.
	/// * `lower`: change the identifier to lower case.
	/// * `upper`: change the identifier to upper case.
	///
	/// ```
	/// # const binder_driver_return_protocol_BR_OK: u32 = 0;
	/// # const binder_driver_return_protocol_BR_ERROR: u32 = 1;
	/// # const binder_driver_return_protocol_BR_TRANSACTION: u32 = 2;
	/// # const binder_driver_return_protocol_BR_REPLY: u32 = 3;
	/// # const binder_driver_return_protocol_BR_DEAD_REPLY: u32 = 4;
	/// # const binder_driver_return_protocol_BR_TRANSACTION_COMPLETE: u32 = 5;
	/// # const binder_driver_return_protocol_BR_INCREFS: u32 = 6;
	/// # const binder_driver_return_protocol_BR_ACQUIRE: u32 = 7;
	/// # const binder_driver_return_protocol_BR_RELEASE: u32 = 8;
	/// # const binder_driver_return_protocol_BR_DECREFS: u32 = 9;
	/// # const binder_driver_return_protocol_BR_NOOP: u32 = 10;
	/// # const binder_driver_return_protocol_BR_SPAWN_LOOPER: u32 = 11;
	/// # const binder_driver_return_protocol_BR_DEAD_BINDER: u32 = 12;
	/// # const binder_driver_return_protocol_BR_CLEAR_DEATH_NOTIFICATION_DONE: u32 = 13;
	/// # const binder_driver_return_protocol_BR_FAILED_REPLY: u32 = 14;
	/// macro_rules! pub_no_prefix {
	/// ($prefix:ident, $($newname:ident),+) => {
	/// ::kernel::macros::paste! {
	/// $(pub(crate) const fn [<$newname:lower:span>]() -> u32 { [<$prefix $newname:span>] })+
	/// }
	/// };
	/// }
	///
	/// pub_no_prefix!(
	/// binder_driver_return_protocol_,
	/// BR_OK,
	/// BR_ERROR,
	/// BR_TRANSACTION,
	/// BR_REPLY,
	/// BR_DEAD_REPLY,
	/// BR_TRANSACTION_COMPLETE,
	/// BR_INCREFS,
	/// BR_ACQUIRE,
	/// BR_RELEASE,
	/// BR_DECREFS,
	/// BR_NOOP,
	/// BR_SPAWN_LOOPER,
	/// BR_DEAD_BINDER,
	/// BR_CLEAR_DEATH_NOTIFICATION_DONE,
	/// BR_FAILED_REPLY
	/// );
	///
	/// assert_eq!(br_ok(), binder_driver_return_protocol_BR_OK);
	/// ```
	///
	/// # Literals
	///
	/// Literals can also be concatenated with other identifiers:
	///
	/// ```
	/// macro_rules! create_numbered_fn {
	/// ($name:literal, $val:literal) => {
	/// ::kernel::macros::paste! {
	/// fn [<some_ $name _fn $val>]() -> u32 { $val }
	/// }
	/// };
	/// }
	///
	/// create_numbered_fn!("foo", 100);
	///
	/// assert_eq!(some_foo_fn100(), 100)
	/// ```
	///
	/// [`paste`]: https://docs.rs/paste/
	#[proc_macro]
	pub fn paste(input: TokenStream) -> TokenStream {
	let mut tokens = input.into_iter().collect();
	paste::expand(&mut tokens);
	tokens.into_iter().collect()
	}

	/// Registers a KUnit test suite and its test cases using a user-space like syntax.
	///
	/// This macro should be used on modules. If `CONFIG_KUNIT` (in `.config`) is `n`, the target module
	/// is ignored.
	///
	/// # Examples
	///
	/// ```ignore
	/// # use kernel::prelude::*;
	/// #[kunit_tests(kunit_test_suit_name)]
	/// mod tests {
	/// #[test]
	/// fn foo() {
	/// assert_eq!(1, 1);
	/// }
	///
	/// #[test]
	/// fn bar() {
	/// assert_eq!(2, 2);
	/// }
	/// }
	/// ```
	#[proc_macro_attribute]
	pub fn kunit_tests(attr: TokenStream, ts: TokenStream) -> TokenStream {
	kunit::kunit_tests(attr, ts)
	}