When building the rust_print sample with CONFIG_JUMP_LABEL=n, the Rust
static key support falls back to using static_key_count. This function
accepts a mutable pointer to the `struct static_key`, but the Rust
abstractions are incorrectly passing a const pointer.
This means that builds using CONFIG_JUMP_LABEL=n and SAMPLE_RUST_PRINT=y
fail with the following error message:
error[E0308]: mismatched types
--> <root>/samples/rust/rust_print_main.rs:87:5
|
87 | / kernel::declare_trace! {
88 | | /// # Safety
89 | | ///
90 | | /// Always safe to call.
91 | | unsafe fn rust_sample_loaded(magic: c_int);
92 | | }
| | ^
| | |
| |_____types differ in mutability
| arguments to this function are incorrect
|
= note: expected raw pointer `*mut kernel::bindings::static_key`
found raw pointer `*const kernel::bindings::static_key`
note: function defined here
--> <root>/rust/bindings/bindings_helpers_generated.rs:33:12
|
33 | pub fn static_key_count(key: *mut static_key) -> c_int;
| ^^^^^^^^^^^^^^^^
To fix this, insert a pointer cast so that the pointer is mutable.
Reported-by: kernel test robot <l...@intel.com>
Closes:
https://lore.kernel.org/oe-kbuild-all/202411181440.qedcuyh6-...@intel.com/
Fixes: 169484ab6677 ("rust: add arch_static_branch")
Signed-off-by: Alice Ryhl <alicer...@google.com>
---
rust/kernel/jump_label.rs | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/rust/kernel/jump_label.rs b/rust/kernel/jump_label.rs
index 2f2df03a3275..b5aff632ecc7 100644
--- a/rust/kernel/jump_label.rs
+++ b/rust/kernel/jump_label.rs
@@ -26,7 +26,7 @@ macro_rules! static_branch_unlikely {
#[cfg(not(CONFIG_JUMP_LABEL))]
{
- $crate::bindings::static_key_count(_key) > 0
+ $crate::bindings::static_key_count(_key.cast_mut()) > 0
}
#[cfg(CONFIG_JUMP_LABEL)]
base-commit: 22193c586b43ee88d66954395885742a6e4a49a9
--
2.47.0.338.g60cca15819-goog
