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rust: error: Add Error::to_ptr()

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This is the Rust equivalent to ERR_PTR(), for use in C callbacks.
Marked as #[allow(dead_code)] for now, since it does not have any
consumers yet.

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Asahi Lina <lina@asahilina.net>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://lore.kernel.org/r/20230224-rust-error-v3-2-03779bddc02b@asahilina.net
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Asahi Lina 2023-04-03 18:48:11 +09:00 • committed by Miguel Ojeda
parent 46384d0990
commit c7e20faa5f
2 changed files with 14 additions and 0 deletions
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7
rust/helpers.c
View file

@ -20,6 +20,7 @@
#include <linux/bug.h> #include <linux/bug.h>
#include <linux/build_bug.h> #include <linux/build_bug.h>
#include <linux/err.h>
#include <linux/refcount.h> #include <linux/refcount.h>
__noreturn void rust_helper_BUG(void) __noreturn void rust_helper_BUG(void)
@ -46,6 +47,12 @@ bool rust_helper_refcount_dec_and_test(refcount_t *r)
} }
EXPORT_SYMBOL_GPL(rust_helper_refcount_dec_and_test); EXPORT_SYMBOL_GPL(rust_helper_refcount_dec_and_test);
__force void *rust_helper_ERR_PTR(long err)
{
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(rust_helper_ERR_PTR);
/* /*
* We use `bindgen`'s `--size_t-is-usize` option to bind the C `size_t` type * We use `bindgen`'s `--size_t-is-usize` option to bind the C `size_t` type
* as the Rust `usize` type, so we can use it in contexts where Rust * as the Rust `usize` type, so we can use it in contexts where Rust

7
rust/kernel/error.rs
View file

@ -76,6 +76,13 @@ impl Error {
pub fn to_errno(self) -> core::ffi::c_int { pub fn to_errno(self) -> core::ffi::c_int {
self.0 self.0
} }
/// Returns the error encoded as a pointer.
#[allow(dead_code)]
pub(crate) fn to_ptr<T>(self) -> *mut T {
// SAFETY: self.0 is a valid error due to its invariant.
unsafe { bindings::ERR_PTR(self.0.into()) as *mut _ }
}
} }
impl From<AllocError> for Error { impl From<AllocError> for Error {