[PATCH 2/2] checkpatch: warn on known non-plural rust doc headers

[Patrick Miller <paddymills@proton.me>]

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Adds a check for documentation in rust file. Warns if certain known
documentation headers are not plural.

Signed-off-by: Patrick Miller <paddymills@proton.me>
Suggested-by: Miguel Ojeda <ojeda@kernel.org>
Link: https://github.com/Rust-for-Linux/linux/issues/1110

---
 scripts/checkpatch.pl | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 39032224d504..0e99d11eeb04 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3900,6 +3900,14 @@ sub process {
 			     "Avoid using '.L' prefixed local symbol names for denoting a range of code via 'SYM_*_START/END' annotations; see Documentation/core-api/asm-annotations.rst\n" . $herecurr);
 		}
 
+# check that document section headers are plural in rust files
+        if (   $realfile =~ /\.rs$/
+            && $rawline =~ /^\+\s*\/\/\/\s+#+\s+(Example|Invariant)\s*$/ )
+        {
+            WARN( "RUST_DOC_HEADER",
+                "Rust doc he
aders should be plural\n" . $herecurr );
+        }
+
 # check we are in a valid source file C or perl if not then ignore this hunk
 		next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/);
 
-- 
2.46.0


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