[PATCH 1/3] rust: kunit: use `file!()` inside `kunit_assert!`
From: Gary Guo
Date: Tue Jun 16 2026 - 11:29:35 EST
This parameter is needed currently because doctests want to override the
file. Simplify it by changing it to use `file!()`. Have doctests override
`file!()` macro to achieve the current behavior.
This allows us to remove the `file` helper and associated Kconfig options.
Signed-off-by: Gary Guo <gary@xxxxxxxxxxx>
---
Documentation/rust/general-information.rst | 4 ++--
init/Kconfig | 3 ---
rust/kernel/kunit.rs | 9 +++++----
rust/macros/helpers.rs | 16 ----------------
rust/macros/kunit.rs | 5 ++---
rust/macros/lib.rs | 5 -----
scripts/rustdoc_test_gen.rs | 10 ++++++++--
7 files changed, 17 insertions(+), 35 deletions(-)
diff --git a/Documentation/rust/general-information.rst b/Documentation/rust/general-information.rst
index 09234bed272c..20e3178ebfd4 100644
--- a/Documentation/rust/general-information.rst
+++ b/Documentation/rust/general-information.rst
@@ -157,5 +157,5 @@ numerical comparisons, one may define a new Kconfig symbol:
.. code-block:: kconfig
- config RUSTC_HAS_SPAN_FILE
- def_bool RUSTC_VERSION >= 108800
+ config RUSTC_HAS_FILE_AS_C_STR
+ def_bool RUSTC_VERSION >= 109100
diff --git a/init/Kconfig b/init/Kconfig
index 5230d4879b1c..e118fdb9df11 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -178,9 +178,6 @@ config LD_CAN_USE_KEEP_IN_OVERLAY
# https://github.com/llvm/llvm-project/pull/130661
def_bool LD_IS_BFD || LLD_VERSION >= 210000
-config RUSTC_HAS_SPAN_FILE
- def_bool RUSTC_VERSION >= 108800
-
config RUSTC_HAS_UNNECESSARY_TRANSMUTES
def_bool RUSTC_VERSION >= 108800
diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs
index cdee5f27bd7f..157fd0634708 100644
--- a/rust/kernel/kunit.rs
+++ b/rust/kernel/kunit.rs
@@ -58,14 +58,15 @@ pub fn info(args: fmt::Arguments<'_>) {
#[doc(hidden)]
#[macro_export]
macro_rules! kunit_assert {
- ($name:literal, $file:literal, $diff:expr, $condition:expr $(,)?) => {
+ ($name:literal, $diff:expr, $condition:expr $(,)?) => {
'out: {
// Do nothing if the condition is `true`.
if $condition {
break 'out;
}
- static FILE: &'static $crate::str::CStr = $file;
+ // Use `file!()` instead of `::core::file!()` here so it can be overridden.
+ static FILE: &'static $crate::str::CStr = $crate::c_str!(file!());
static LINE: i32 = ::core::line!() as i32 - $diff;
static CONDITION: &'static $crate::str::CStr = $crate::c_str!(stringify!($condition));
@@ -164,10 +165,10 @@ unsafe impl Sync for UnaryAssert {}
#[doc(hidden)]
#[macro_export]
macro_rules! kunit_assert_eq {
- ($name:literal, $file:literal, $diff:expr, $left:expr, $right:expr $(,)?) => {{
+ ($name:literal, $diff:expr, $left:expr, $right:expr $(,)?) => {{
// For the moment, we just forward to the expression assert because, for binary asserts,
// KUnit supports only a few types (e.g. integers).
- $crate::kunit_assert!($name, $file, $diff, $left == $right);
+ $crate::kunit_assert!($name, $diff, $left == $right);
}};
}
diff --git a/rust/macros/helpers.rs b/rust/macros/helpers.rs
index d18fbf4daa0a..8cc9a20f470e 100644
--- a/rust/macros/helpers.rs
+++ b/rust/macros/helpers.rs
@@ -38,22 +38,6 @@ pub(crate) fn value(&self) -> String {
}
}
-pub(crate) fn file() -> String {
- #[cfg(not(CONFIG_RUSTC_HAS_SPAN_FILE))]
- {
- proc_macro::Span::call_site()
- .source_file()
- .path()
- .to_string_lossy()
- .into_owned()
- }
-
- #[cfg(CONFIG_RUSTC_HAS_SPAN_FILE)]
- {
- proc_macro::Span::call_site().file()
- }
-}
-
/// Obtain all `#[cfg]` attributes.
pub(crate) fn gather_cfg_attrs(attr: &[Attribute]) -> impl Iterator<Item = &Attribute> + '_ {
attr.iter().filter(|a| a.path().is_ident("cfg"))
diff --git a/rust/macros/kunit.rs b/rust/macros/kunit.rs
index ae20ed6768f1..936eff014870 100644
--- a/rust/macros/kunit.rs
+++ b/rust/macros/kunit.rs
@@ -109,12 +109,11 @@ pub(crate) fn kunit_tests(test_suite: Ident, mut module: ItemMod) -> Result<Toke
// Before the test, override usual `assert!` and `assert_eq!` macros with ones that call
// KUnit instead.
let test_str = test.to_string();
- let path = CString::new(crate::helpers::file()).expect("file path cannot contain NUL");
processed_items.push(parse_quote! {
#[allow(unused)]
macro_rules! assert {
($cond:expr $(,)?) => {{
- kernel::kunit_assert!(#test_str, #path, 0, $cond);
+ kernel::kunit_assert!(#test_str, 0, $cond);
}}
}
});
@@ -122,7 +121,7 @@ macro_rules! assert {
#[allow(unused)]
macro_rules! assert_eq {
($left:expr, $right:expr $(,)?) => {{
- kernel::kunit_assert_eq!(#test_str, #path, 0, $left, $right);
+ kernel::kunit_assert_eq!(#test_str, 0, $left, $right);
}}
}
});
diff --git a/rust/macros/lib.rs b/rust/macros/lib.rs
index 4a48fabbc268..6b00f9789772 100644
--- a/rust/macros/lib.rs
+++ b/rust/macros/lib.rs
@@ -8,11 +8,6 @@
// Stable since Rust 1.87.0.
#![feature(extract_if)]
-//
-// Stable since Rust 1.88.0 under a different name, `proc_macro_span_file`,
-// which was added in Rust 1.88.0. This is why `cfg_attr` is used here, i.e.
-// to avoid depending on the full `proc_macro_span` on Rust >= 1.88.0.
-#![cfg_attr(not(CONFIG_RUSTC_HAS_SPAN_FILE), feature(proc_macro_span))]
mod concat_idents;
mod export;
diff --git a/scripts/rustdoc_test_gen.rs b/scripts/rustdoc_test_gen.rs
index d61a77219a8c..37f4877f52e2 100644
--- a/scripts/rustdoc_test_gen.rs
+++ b/scripts/rustdoc_test_gen.rs
@@ -169,12 +169,18 @@ fn main() {
r#"/// Generated `{name}` KUnit test case from a Rust documentation test.
#[no_mangle]
pub extern "C" fn {kunit_name}(__kunit_test: *mut ::kernel::bindings::kunit) {{
+ /// Overrides the usual [`file!`] macro with one that expands to the real path.
+ #[allow(unused)]
+ macro_rules! file {{
+ () => {{ "{real_path}" }}
+ }}
+
/// Overrides the usual [`assert!`] macro with one that calls KUnit instead.
#[allow(unused)]
macro_rules! assert {{
($cond:expr $(,)?) => {{{{
::kernel::kunit_assert!(
- "{kunit_name}", c"{real_path}", __DOCTEST_ANCHOR - {line}, $cond
+ "{kunit_name}", __DOCTEST_ANCHOR - {line}, $cond
);
}}}}
}}
@@ -184,7 +190,7 @@ macro_rules! assert {{
macro_rules! assert_eq {{
($left:expr, $right:expr $(,)?) => {{{{
::kernel::kunit_assert_eq!(
- "{kunit_name}", c"{real_path}", __DOCTEST_ANCHOR - {line}, $left, $right
+ "{kunit_name}", __DOCTEST_ANCHOR - {line}, $left, $right
);
}}}}
}}
--
2.54.0