commit c682e4c37d2b8ba3bde1125cbbea4ee88824b4e2 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
55fba69fbf