[PATCH v2 07/33] rust: allow globally `clippy::incompatible_msrv`

[Miguel Ojeda <ojeda@kernel.org>]

`clippy::incompatible_msrv` is not buying us much, and we discussed
allowing it several times in the past.

For instance, there was recently another patch sent to `allow` it where
needed [1]. While that particular case would not be needed after the
minimum version bump to 1.85.0, it is simpler to just allow it to prevent
future instances.

Thus do so, and remove the last instance of locally allowing it we have
in the tree (except the one in the vendored `proc_macro2` crate).

Note that we still keep the `msrv` config option in `clippy.toml` since
that affects other lints as well.

Link: https://lore.kernel.org/rust-for-linux/20260404212831.78971-4-jhubbard@nvidia.com/ [1]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 Makefile               | 1 +
 rust/macros/helpers.rs | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index a63684c36d60..78f5ee173eda 100644
--- a/Makefile
+++ b/Makefile
@@ -486,6 +486,7 @@ export rust_common_flags := --edition=2021 \
 			    -Wclippy::as_underscore \
 			    -Wclippy::cast_lossless \
 			    -Wclippy::ignored_unit_patterns \
+			    -Aclippy::incompatible_msrv \
 			    -Wclippy::mut_mut \
 			    -Wclippy::needless_bitwise_bool \
 			    -Aclippy::needless_lifetimes \
diff --git a/rust/macros/helpers.rs b/rust/macros/helpers.rs
index 37ef6a6f2c85..d18fbf4daa0a 100644
--- a/rust/macros/helpers.rs
+++ b/rust/macros/helpers.rs
@@ -49,7 +49,6 @@ pub(crate) fn file() -> String {
     }
 
     #[cfg(CONFIG_RUSTC_HAS_SPAN_FILE)]
-    #[allow(clippy::incompatible_msrv)]
     {
         proc_macro::Span::call_site().file()
     }
-- 
2.53.0