On Tuesday, February 14th, 2023 at 23:47, David Gow davidgow@google.com wrote:
The rust_fmt_argument function is called from printk() to handle the %pA format specifier.
Since it's called from C, we should mark it extern "C" to make sure it's ABI compatible.
Cc: stable@vger.kernel.org Fixes: 247b365dc8dc ("rust: add `kernel` crate") Signed-off-by: David Gow davidgow@google.com
Reviewed-by: Björn Roy Baron bjorn3_gh@protonmail.com
See discussion in: https://github.com/Rust-for-Linux/linux/pull/967 and https://github.com/Rust-for-Linux/linux/pull/966
rust/kernel/print.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/rust/kernel/print.rs b/rust/kernel/print.rs index 30103325696d..ec457f0952fe 100644 --- a/rust/kernel/print.rs +++ b/rust/kernel/print.rs @@ -18,7 +18,7 @@ use crate::bindings;
// Called from `vsprintf` with format specifier `%pA`. #[no_mangle] -unsafe fn rust_fmt_argument(buf: *mut c_char, end: *mut c_char, ptr: *const c_void) -> *mut c_char { +unsafe extern "C" fn rust_fmt_argument(buf: *mut c_char, end: *mut c_char, ptr: *const c_void) -> *mut c_char { use fmt::Write; // SAFETY: The C contract guarantees that `buf` is valid if it's less than `end`. let mut w = unsafe { RawFormatter::from_ptrs(buf.cast(), end.cast()) }; -- 2.39.1.581.gbfd45094c4-goog