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

1 files changed, 10 insertions, 6 deletions

diff --git a/scripts/rustdoc_test_gen.rs b/scripts/rustdoc_test_gen.rs
index ec8d70ac888b..1ca253594d38 100644
--- a/scripts/rustdoc_test_gen.rs
+++ b/scripts/rustdoc_test_gen.rs
@@ -167,12 +167,14 @@ fn main() {
             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
+            );
         }}}}
     }}
 
@@ -180,13 +182,15 @@ pub extern "C" fn {kunit_name}(__kunit_test: *mut kernel::bindings::kunit) {{
     #[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.
@@ -197,11 +201,11 @@ pub extern "C" fn {kunit_name}(__kunit_test: *mut kernel::bindings::kunit) {{
     // 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();