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| author | Asahi Lina <lina@asahilina.net> | 2023-04-03 18:48:11 +0900 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2023-04-12 18:41:04 +0200 |
| commit | c7e20faa5fcad7a177cf6c306138010343dd6d3e (patch) | |
| tree | db1b09d4b29aaaee63801fb656dc1f4bf9a658e5 /rust | |
| parent | 46384d0990bf99ed8b597e8794ea581e2a647710 (diff) | |
| download | linux-c7e20faa5fcad7a177cf6c306138010343dd6d3e.tar.gz | |
rust: error: Add Error::to_ptr()
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>
Diffstat (limited to 'rust')
| -rw-r--r-- | rust/helpers.c | 7 | ||||
| -rw-r--r-- | rust/kernel/error.rs | 7 |
2 files changed, 14 insertions, 0 deletions
diff --git a/rust/helpers.c b/rust/helpers.c index 09a4d93f9d62cc..89f4cd1e0df356 100644 --- a/rust/helpers.c +++ b/rust/helpers.c @@ -20,6 +20,7 @@ #include <linux/bug.h> #include <linux/build_bug.h> +#include <linux/err.h> #include <linux/refcount.h> __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); +__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 * as the Rust `usize` type, so we can use it in contexts where Rust diff --git a/rust/kernel/error.rs b/rust/kernel/error.rs index 35894fa35efe7d..154d0ca6e2dcbf 100644 --- a/rust/kernel/error.rs +++ b/rust/kernel/error.rs @@ -76,6 +76,13 @@ impl Error { pub fn to_errno(self) -> core::ffi::c_int { 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 { |