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authorAsahi Lina <lina@asahilina.net>2023-04-03 18:48:11 +0900
committerMiguel Ojeda <ojeda@kernel.org>2023-04-12 18:41:04 +0200
commitc7e20faa5fcad7a177cf6c306138010343dd6d3e (patch)
treedb1b09d4b29aaaee63801fb656dc1f4bf9a658e5 /rust
parent46384d0990bf99ed8b597e8794ea581e2a647710 (diff)
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.c7
-rw-r--r--rust/kernel/error.rs7
2 files changed, 14 insertions, 0 deletions
diff --git a/rust/helpers.c b/rust/helpers.c
index 09a4d93f9d62..89f4cd1e0df3 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 35894fa35efe..154d0ca6e2dc 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 {