On Sat, 2 Nov 2024 at 01:47, Boqun Feng <boqun.feng@xxxxxxxxx> wrote: > > On Fri, Nov 01, 2024 at 02:45:00PM +0800, David Gow wrote: > > From: José Expósito <jose.exposito89@xxxxxxxxx> > > > > Add a couple of Rust const functions and macros to allow to develop > > KUnit tests without relying on generated C code: > > > > - The `kunit_unsafe_test_suite!` Rust macro is similar to the > > `kunit_test_suite` C macro. It requires a NULL-terminated array of > > test cases (see below). > > - The `kunit_case` Rust function is similar to the `KUNIT_CASE` C macro. > > It generates as case from the name and function. > > - The `kunit_case_null` Rust function generates a NULL test case, which > > is to be used as delimiter in `kunit_test_suite!`. > > > > While these functions and macros can be used on their own, a future > > patch will introduce another macro to create KUnit tests using a > > user-space like syntax. > > > > Signed-off-by: José Expósito <jose.exposito89@xxxxxxxxx> > > Co-developed-by: Matt Gilbride <mattgilbride@xxxxxxxxxx> > > Signed-off-by: Matt Gilbride <mattgilbride@xxxxxxxxxx> > > Co-developed-by: David Gow <davidgow@xxxxxxxxxx> > > Signed-off-by: David Gow <davidgow@xxxxxxxxxx> > > --- > > > > Changes since v3: > > https://lore.kernel.org/linux-kselftest/20241030045719.3085147-4-davidgow@xxxxxxxxxx/ > > - The kunit_unsafe_test_suite!() macro now panic!s if the suite name is > > too long, triggering a compile error. (Thanks, Alice!) > > > > Changes since v2: > > https://lore.kernel.org/linux-kselftest/20241029092422.2884505-2-davidgow@xxxxxxxxxx/ > > - The kunit_unsafe_test_suite!() macro will truncate the name of the > > suite if it is too long. (Thanks Alice!) > > - We no longer needlessly use UnsafeCell<> in > > kunit_unsafe_test_suite!(). (Thanks Alice!) > > > > Changes since v1: > > https://lore.kernel.org/lkml/20230720-rustbind-v1-1-c80db349e3b5@xxxxxxxxxx/ > > - Rebase on top of rust-next > > - As a result, KUnit attributes are new set. These are hardcoded to the > > defaults of "normal" speed and no module name. > > - Split the kunit_case!() macro into two const functions, kunit_case() > > and kunit_case_null() (for the NULL terminator). > > > > --- > > rust/kernel/kunit.rs | 112 +++++++++++++++++++++++++++++++++++++++++++ > > rust/kernel/lib.rs | 1 + > > 2 files changed, 113 insertions(+) > > > > diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs > > index 824da0e9738a..85bc1faff0d5 100644 > > --- a/rust/kernel/kunit.rs > > +++ b/rust/kernel/kunit.rs > > @@ -161,3 +161,115 @@ macro_rules! kunit_assert_eq { > > $crate::kunit_assert!($name, $file, $diff, $left == $right); > > }}; > > } > > + > > +/// Represents an individual test case. > > +/// > > +/// The test case should have the signature > > +/// `unsafe extern "C" fn test_case(test: *mut crate::bindings::kunit)`. > > +/// > > +/// The `kunit_unsafe_test_suite!` macro expects a NULL-terminated list of test cases. > > +/// Use `kunit_case_null` to generate such a delimeter. > > +const fn kunit_case(name: &'static kernel::str::CStr, run_case: unsafe extern "C" fn(*mut kernel::bindings::kunit)) -> kernel::bindings::kunit_case { > > + kernel::bindings::kunit_case { > > + run_case: Some(run_case), > > + name: name.as_char_ptr(), > > + attr: kernel::bindings::kunit_attributes { > > + speed: kernel::bindings::kunit_speed_KUNIT_SPEED_NORMAL, > > + }, > > + generate_params: None, > > + status: kernel::bindings::kunit_status_KUNIT_SUCCESS, > > + module_name: core::ptr::null_mut(), > > + log: core::ptr::null_mut(), > > + } > > +} > > + > > +/// Represents the NULL test case delimiter. > > +/// > > +/// The `kunit_unsafe_test_suite!` macro expects a NULL-terminated list of test cases. This > > +/// function retuns such a delimiter. > > +const fn kunit_case_null() -> kernel::bindings::kunit_case { > > + kernel::bindings::kunit_case { > > + run_case: None, > > + name: core::ptr::null_mut(), > > + generate_params: None, > > + attr: kernel::bindings::kunit_attributes { > > + speed: kernel::bindings::kunit_speed_KUNIT_SPEED_NORMAL, > > + }, > > + status: kernel::bindings::kunit_status_KUNIT_SUCCESS, > > + module_name: core::ptr::null_mut(), > > + log: core::ptr::null_mut(), > > + } > > +} > > + > > + > > +/// Registers a KUnit test suite. > > +/// > > +/// # Safety > > +/// > > +/// `test_cases` must be a NULL terminated array of test cases. > > +/// > > +/// # Examples > > +/// > > +/// ```ignore > > +/// unsafe extern "C" fn test_fn(_test: *mut crate::bindings::kunit) { > > +/// let actual = 1 + 1; > > +/// let expected = 2; > > +/// assert_eq!(actual, expected); > > +/// } > > +/// > > +/// static mut KUNIT_TEST_CASE: crate::bindings::kunit_case = crate::kunit_case(name, test_fn); > > +/// static mut KUNIT_NULL_CASE: crate::bindings::kunit_case = crate::kunit_case_null(); > > +/// static mut KUNIT_TEST_CASES: &mut[crate::bindings::kunit_case] = unsafe { > > +/// &mut[KUNIT_TEST_CASE, KUNIT_NULL_CASE] > > +/// }; > > +/// crate::kunit_unsafe_test_suite!(suite_name, KUNIT_TEST_CASES); > > +/// ``` > > +#[macro_export] > > +macro_rules! kunit_unsafe_test_suite { > > + ($name:ident, $test_cases:ident) => { > > + const _: () = { > > + static KUNIT_TEST_SUITE_NAME: [i8; 256] = { > > + let name_u8 = core::stringify!($name).as_bytes(); > > + let mut ret = [0; 256]; > > + > > + if name_u8.len() > 255 { > > + panic!(concat!("The test suite name `", core::stringify!($name), "` exceeds the maximum length of 255 bytes.")); > > + } > > + > > + let mut i = 0; > > + while i < name_u8.len() { > > + ret[i] = name_u8[i] as i8; > > + i += 1; > > + } > > + > > + ret > > + }; > > + > > + static mut KUNIT_TEST_SUITE: $crate::bindings::kunit_suite = > > + $crate::bindings::kunit_suite { > > + name: KUNIT_TEST_SUITE_NAME, > > + // SAFETY: User is expected to pass a correct `test_cases`, hence this macro > > + // named 'unsafe'. > > + test_cases: unsafe { $test_cases.as_mut_ptr() }, > > + suite_init: None, > > + suite_exit: None, > > + init: None, > > + exit: None, > > + attr: $crate::bindings::kunit_attributes { > > + speed: $crate::bindings::kunit_speed_KUNIT_SPEED_NORMAL, > > + }, > > + status_comment: [0; 256usize], > > + debugfs: core::ptr::null_mut(), > > + log: core::ptr::null_mut(), > > + suite_init_err: 0, > > + is_init: false, > > + }; > > + > > + #[used] > > + #[link_section = ".kunit_test_suites"] > > + static mut KUNIT_TEST_SUITE_ENTRY: *const $crate::bindings::kunit_suite = > > + // SAFETY: `KUNIT_TEST_SUITE` is static. > > + unsafe { core::ptr::addr_of_mut!(KUNIT_TEST_SUITE) }; > > FYI, `addr_of` and `addr_of_mut` is safe now on statics since 1.82: > > https://blog.rust-lang.org/2024/10/17/Rust-1.82.0.html#safely-addressing-unsafe-statics > > We need a `#[allow(unused_unsafe)]` here to avoid the unused unsafe > warning. > I've not been able to work out how to fix this: adding "#![allow(unused_unsafe)]" to the unsafe block here triggers another error: ERROR:root:error[E0658]: attributes on expressions are experimental Is there somewhere else we can put the attribute to support this without having to either disable the warning, or use the experimental feature globally? -- David
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