rust: use absolute paths in macros referencing core and kernel

Macros and auto-generated code should use absolute paths, `::core::...`
and `::kernel::...`, for core and kernel references.

This prevents issues where user-defined modules named `core` or `kernel`
could be picked up instead of the `core` or `kernel` crates.

Thus clean some references up.

Suggested-by: Benno Lossin <[e-mail]>
Closes: https://github.com/Rust-for-Linux/linux/issues/1150
Signed-off-by: Igor Korotin <[e-mail]>
Reviewed-by: Benno Lossin <[e-mail]>
Acked-by: Greg Kroah-Hartman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
[ Applied `rustfmt`. Reworded slightly. - Miguel ]
Signed-off-by: Miguel Ojeda <[e-mail]>

rust/ffi.rs

···
 
         // Check size compatibility with `core`.
         const _: () = assert!(
-            core::mem::size_of::<$name>() == core::mem::size_of::<core::ffi::$name>()
+            ::core::mem::size_of::<$name>() == ::core::mem::size_of::<::core::ffi::$name>()
         );
     )*}
 }

rust/kernel/device.rs

···
 macro_rules! dev_printk {
     ($method:ident, $dev:expr, $($f:tt)*) => {
         {
-            ($dev).$method(core::format_args!($($f)*));
+            ($dev).$method(::core::format_args!($($f)*));
         }
     }
 }

rust/kernel/device_id.rs

···
                     "_", line!(),
                     "_", stringify!($table_name))
         ]
-        static $module_table_name: [core::mem::MaybeUninit<u8>; $table_name.raw_ids().size()] =
-            unsafe { core::mem::transmute_copy($table_name.raw_ids()) };
+        static $module_table_name: [::core::mem::MaybeUninit<u8>; $table_name.raw_ids().size()] =
+            unsafe { ::core::mem::transmute_copy($table_name.raw_ids()) };
     };
 }

rust/kernel/kunit.rs

···
             }
 
             static FILE: &'static $crate::str::CStr = $crate::c_str!($file);
-            static LINE: i32 = core::line!() as i32 - $diff;
+            static LINE: i32 = ::core::line!() as i32 - $diff;
             static CONDITION: &'static $crate::str::CStr = $crate::c_str!(stringify!($condition));
 
             // SAFETY: FFI call without safety requirements.
···
             unsafe {
                 $crate::bindings::__kunit_do_failed_assertion(
                     kunit_test,
-                    core::ptr::addr_of!(LOCATION.0),
+                    ::core::ptr::addr_of!(LOCATION.0),
                     $crate::bindings::kunit_assert_type_KUNIT_ASSERTION,
-                    core::ptr::addr_of!(ASSERTION.0.assert),
+                    ::core::ptr::addr_of!(ASSERTION.0.assert),
                     Some($crate::bindings::kunit_unary_assert_format),
-                    core::ptr::null(),
+                    ::core::ptr::null(),
                 );
             }
 

rust/kernel/static_assert.rs

···
 #[macro_export]
 macro_rules! static_assert {
     ($condition:expr $(,$arg:literal)?) => {
-        const _: () = core::assert!($condition $(,$arg)?);
+        const _: () = ::core::assert!($condition $(,$arg)?);
     };
 }

rust/kernel/str.rs

···
 
     macro_rules! format {
         ($($f:tt)*) => ({
-            &*String::from_fmt(kernel::fmt!($($f)*))
+            &*String::from_fmt(::kernel::fmt!($($f)*))
         })
     }
 
···
 /// A convenience alias for [`core::format_args`].
 #[macro_export]
 macro_rules! fmt {
-    ($($f:tt)*) => ( core::format_args!($($f)*) )
+    ($($f:tt)*) => ( ::core::format_args!($($f)*) )
 }

rust/macros/kunit.rs

···
     // Looks like:
     //
     // ```
-    // unsafe extern "C" fn kunit_rust_wrapper_foo(_test: *mut kernel::bindings::kunit) { foo(); }
-    // unsafe extern "C" fn kunit_rust_wrapper_bar(_test: *mut kernel::bindings::kunit) { bar(); }
+    // unsafe extern "C" fn kunit_rust_wrapper_foo(_test: *mut ::kernel::bindings::kunit) { foo(); }
+    // unsafe extern "C" fn kunit_rust_wrapper_bar(_test: *mut ::kernel::bindings::kunit) { bar(); }
     //
-    // static mut TEST_CASES: [kernel::bindings::kunit_case; 3] = [
-    //     kernel::kunit::kunit_case(kernel::c_str!("foo"), kunit_rust_wrapper_foo),
-    //     kernel::kunit::kunit_case(kernel::c_str!("bar"), kunit_rust_wrapper_bar),
-    //     kernel::kunit::kunit_case_null(),
+    // static mut TEST_CASES: [::kernel::bindings::kunit_case; 3] = [
+    //     ::kernel::kunit::kunit_case(::kernel::c_str!("foo"), kunit_rust_wrapper_foo),
+    //     ::kernel::kunit::kunit_case(::kernel::c_str!("bar"), kunit_rust_wrapper_bar),
+    //     ::kernel::kunit::kunit_case_null(),
     // ];
     //
-    // kernel::kunit_unsafe_test_suite!(kunit_test_suit_name, TEST_CASES);
+    // ::kernel::kunit_unsafe_test_suite!(kunit_test_suit_name, TEST_CASES);
     // ```
     let mut kunit_macros = "".to_owned();
     let mut test_cases = "".to_owned();
     for test in &tests {
         let kunit_wrapper_fn_name = format!("kunit_rust_wrapper_{test}");
         let kunit_wrapper = format!(
-            "unsafe extern \"C\" fn {kunit_wrapper_fn_name}(_test: *mut kernel::bindings::kunit) {{ {test}(); }}"
+            "unsafe extern \"C\" fn {kunit_wrapper_fn_name}(_test: *mut ::kernel::bindings::kunit) {{ {test}(); }}"
         );
         writeln!(kunit_macros, "{kunit_wrapper}").unwrap();
         writeln!(
             test_cases,
-            "    kernel::kunit::kunit_case(kernel::c_str!(\"{test}\"), {kunit_wrapper_fn_name}),"
+            "    ::kernel::kunit::kunit_case(::kernel::c_str!(\"{test}\"), {kunit_wrapper_fn_name}),"
         )
         .unwrap();
     }
···
     writeln!(kunit_macros).unwrap();
     writeln!(
         kunit_macros,
-        "static mut TEST_CASES: [kernel::bindings::kunit_case; {}] = [\n{test_cases}    kernel::kunit::kunit_case_null(),\n];",
+        "static mut TEST_CASES: [::kernel::bindings::kunit_case; {}] = [\n{test_cases}    ::kernel::kunit::kunit_case_null(),\n];",
         tests.len() + 1
     )
     .unwrap();
 
     writeln!(
         kunit_macros,
-        "kernel::kunit_unsafe_test_suite!({attr}, TEST_CASES);"
+        "::kernel::kunit_unsafe_test_suite!({attr}, TEST_CASES);"
     )
     .unwrap();
 

rust/macros/lib.rs

···
 /// # const binder_driver_return_protocol_BR_FAILED_REPLY: u32 = 14;
 /// macro_rules! pub_no_prefix {
 ///     ($prefix:ident, $($newname:ident),+) => {
-///         kernel::macros::paste! {
+///         ::kernel::macros::paste! {
 ///             $(pub(crate) const $newname: u32 = [<$prefix $newname>];)+
 ///         }
 ///     };
···
 /// # const binder_driver_return_protocol_BR_FAILED_REPLY: u32 = 14;
 /// macro_rules! pub_no_prefix {
 ///     ($prefix:ident, $($newname:ident),+) => {
-///         kernel::macros::paste! {
+///         ::kernel::macros::paste! {
 ///             $(pub(crate) const fn [<$newname:lower:span>]() -> u32 { [<$prefix $newname:span>] })+
 ///         }
 ///     };
···
 /// ```
 /// macro_rules! create_numbered_fn {
 ///     ($name:literal, $val:literal) => {
-///         kernel::macros::paste! {
+///         ::kernel::macros::paste! {
 ///             fn [<some_ $name _fn $val>]() -> u32 { $val }
 ///         }
 ///     };

rust/macros/module.rs

···
             // SAFETY: `__this_module` is constructed by the kernel at load time and will not be
             // freed until the module is unloaded.
             #[cfg(MODULE)]
-            static THIS_MODULE: kernel::ThisModule = unsafe {{
+            static THIS_MODULE: ::kernel::ThisModule = unsafe {{
                 extern \"C\" {{
-                    static __this_module: kernel::types::Opaque<kernel::bindings::module>;
+                    static __this_module: ::kernel::types::Opaque<::kernel::bindings::module>;
                 }}
 
-                kernel::ThisModule::from_ptr(__this_module.get())
+                ::kernel::ThisModule::from_ptr(__this_module.get())
             }};
             #[cfg(not(MODULE))]
-            static THIS_MODULE: kernel::ThisModule = unsafe {{
-                kernel::ThisModule::from_ptr(core::ptr::null_mut())
+            static THIS_MODULE: ::kernel::ThisModule = unsafe {{
+                ::kernel::ThisModule::from_ptr(::core::ptr::null_mut())
             }};
 
             /// The `LocalModule` type is the type of the module created by `module!`,
             /// `module_pci_driver!`, `module_platform_driver!`, etc.
             type LocalModule = {type_};
 
-            impl kernel::ModuleMetadata for {type_} {{
-                const NAME: &'static kernel::str::CStr = kernel::c_str!(\"{name}\");
+            impl ::kernel::ModuleMetadata for {type_} {{
+                const NAME: &'static ::kernel::str::CStr = ::kernel::c_str!(\"{name}\");
             }}
 
             // Double nested modules, since then nobody can access the public items inside.
···
                     #[used]
                     static __IS_RUST_MODULE: () = ();
 
-                    static mut __MOD: core::mem::MaybeUninit<{type_}> =
-                        core::mem::MaybeUninit::uninit();
+                    static mut __MOD: ::core::mem::MaybeUninit<{type_}> =
+                        ::core::mem::MaybeUninit::uninit();
 
                     // Loadable modules need to export the `{{init,cleanup}}_module` identifiers.
                     /// # Safety
···
                     #[doc(hidden)]
                     #[no_mangle]
                     #[link_section = \".init.text\"]
-                    pub unsafe extern \"C\" fn init_module() -> kernel::ffi::c_int {{
+                    pub unsafe extern \"C\" fn init_module() -> ::kernel::ffi::c_int {{
                         // SAFETY: This function is inaccessible to the outside due to the double
                         // module wrapping it. It is called exactly once by the C side via its
                         // unique name.
···
                     #[doc(hidden)]
                     #[link_section = \"{initcall_section}\"]
                     #[used]
-                    pub static __{name}_initcall: extern \"C\" fn() -> kernel::ffi::c_int = __{name}_init;
+                    pub static __{name}_initcall: extern \"C\" fn() -> ::kernel::ffi::c_int =
+                        __{name}_init;
 
                     #[cfg(not(MODULE))]
                     #[cfg(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS)]
-                    core::arch::global_asm!(
+                    ::core::arch::global_asm!(
                         r#\".section \"{initcall_section}\", \"a\"
                         __{name}_initcall:
                             .long   __{name}_init - .
···
                     #[cfg(not(MODULE))]
                     #[doc(hidden)]
                     #[no_mangle]
-                    pub extern \"C\" fn __{name}_init() -> kernel::ffi::c_int {{
+                    pub extern \"C\" fn __{name}_init() -> ::kernel::ffi::c_int {{
                         // SAFETY: This function is inaccessible to the outside due to the double
                         // module wrapping it. It is called exactly once by the C side via its
                         // placement above in the initcall section.
···
                     /// # Safety
                     ///
                     /// This function must only be called once.
-                    unsafe fn __init() -> kernel::ffi::c_int {{
+                    unsafe fn __init() -> ::kernel::ffi::c_int {{
                         let initer =
-                            <{type_} as kernel::InPlaceModule>::init(&super::super::THIS_MODULE);
+                            <{type_} as ::kernel::InPlaceModule>::init(&super::super::THIS_MODULE);
                         // SAFETY: No data race, since `__MOD` can only be accessed by this module
                         // and there only `__init` and `__exit` access it. These functions are only
                         // called once and `__exit` cannot be called before or during `__init`.

scripts/rustdoc_test_builder.rs

···
     //
     // ```
     // fn main() { #[allow(non_snake_case)] fn _doctest_main_rust_kernel_file_rs_28_0() {
-    // fn main() { #[allow(non_snake_case)] fn _doctest_main_rust_kernel_file_rs_37_0() -> Result<(), impl core::fmt::Debug> {
+    // fn main() { #[allow(non_snake_case)] fn _doctest_main_rust_kernel_file_rs_37_0() -> Result<(), impl ::core::fmt::Debug> {
     // ```
     //
     // It should be unlikely that doctest code matches such lines (when code is formatted properly).
···
 
     // Qualify `Result` to avoid the collision with our own `Result` coming from the prelude.
     let body = body.replace(
-        &format!("{rustdoc_function_name}() -> Result<(), impl core::fmt::Debug> {{"),
-        &format!("{rustdoc_function_name}() -> core::result::Result<(), impl core::fmt::Debug> {{"),
+        &format!("{rustdoc_function_name}() -> Result<(), impl ::core::fmt::Debug> {{"),
+        &format!(
+            "{rustdoc_function_name}() -> ::core::result::Result<(), impl ::core::fmt::Debug> {{"
+        ),
     );
 
     // For tests that get generated with `Result`, like above, `rustdoc` generates an `unwrap()` on

scripts/rustdoc_test_gen.rs

···
             rust_tests,
             r#"/// Generated `{name}` KUnit test case from a Rust documentation test.
 #[no_mangle]
-pub extern "C" fn {kunit_name}(__kunit_test: *mut kernel::bindings::kunit) {{
+pub extern "C" fn {kunit_name}(__kunit_test: *mut ::kernel::bindings::kunit) {{
     /// Overrides the usual [`assert!`] macro with one that calls KUnit instead.
     #[allow(unused)]
     macro_rules! assert {{
         ($cond:expr $(,)?) => {{{{
-            kernel::kunit_assert!("{kunit_name}", "{real_path}", __DOCTEST_ANCHOR - {line}, $cond);
+            ::kernel::kunit_assert!(
+                "{kunit_name}", "{real_path}", __DOCTEST_ANCHOR - {line}, $cond
+            );
         }}}}
     }}
 
···
     #[allow(unused)]
     macro_rules! assert_eq {{
         ($left:expr, $right:expr $(,)?) => {{{{
-            kernel::kunit_assert_eq!("{kunit_name}", "{real_path}", __DOCTEST_ANCHOR - {line}, $left, $right);
+            ::kernel::kunit_assert_eq!(
+                "{kunit_name}", "{real_path}", __DOCTEST_ANCHOR - {line}, $left, $right
+            );
         }}}}
     }}
 
     // Many tests need the prelude, so provide it by default.
     #[allow(unused)]
-    use kernel::prelude::*;
+    use ::kernel::prelude::*;
 
     // Unconditionally print the location of the original doctest (i.e. rather than the location in
     // the generated file) so that developers can easily map the test back to the source code.
···
     // This follows the syntax for declaring test metadata in the proposed KTAP v2 spec, which may
     // be used for the proposed KUnit test attributes API. Thus hopefully this will make migration
     // easier later on.
-    kernel::kunit::info(format_args!("    # {kunit_name}.location: {real_path}:{line}\n"));
+    ::kernel::kunit::info(format_args!("    # {kunit_name}.location: {real_path}:{line}\n"));
 
     /// The anchor where the test code body starts.
     #[allow(unused)]
-    static __DOCTEST_ANCHOR: i32 = core::line!() as i32 + {body_offset} + 1;
+    static __DOCTEST_ANCHOR: i32 = ::core::line!() as i32 + {body_offset} + 1;
     {{
         {body}
         main();