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rust: kernel: Mark rust_fmt_argument as extern "C"

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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: 247b365dc8 ("rust: add `kernel` crate")
Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
[Applied `rustfmt`]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
David Gow 2023-02-15 06:47:35 +08:00 committed by Miguel Ojeda
parent e5e86572e3
commit c682e4c37d
1 changed files with 5 additions and 1 deletions
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6
rust/kernel/print.rs
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@ -18,7 +18,11 @@ 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()) };