linux-kernel - [PATCH 1/3] checkpatch: dont warn about unused macro arg on empty body

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Message-ID: <20250325235156.663269-2-jim.cromie@gmail.com>
Date: Tue, 25 Mar 2025 17:51:54 -0600
From: Jim Cromie <jim.cromie@...il.com>
To: linux-kernel@...r.kernel.org
Cc: akpm@...uxfoundation.org,
	Jim Cromie <jim.cromie@...il.com>,
	Andy Whitcroft <apw@...onical.com>,
	Joe Perches <joe@...ches.com>,
	Dwaipayan Ray <dwaipayanray1@...il.com>,
	Lukas Bulwahn <lukas.bulwahn@...il.com>,
	Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH 1/3] checkpatch: dont warn about unused macro arg on empty body

we currently get:
  WARNING: Argument 'name' is not used in function-like macro
on:
  #define DRM_CLASSMAP_USE(name)  /* nothing here */

Following this advice is wrong here, and shouldn't be fixed by
ignoring args altogether; the macro should properly fail if invoked
with 0 or 2+ args.

cc: Andy Whitcroft <apw@...onical.com>
cc: Joe Perches <joe@...ches.com>
cc: Dwaipayan Ray <dwaipayanray1@...il.com>
cc: Lukas Bulwahn <lukas.bulwahn@...il.com>
Signed-off-by: Jim Cromie <jim.cromie@...il.com>
Acked-by: Joe Perches <joe@...ches.com>
Reviewed-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 scripts/checkpatch.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 7b28ad331742..0c4f578ea6e7 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6037,7 +6037,7 @@ sub process {
 				}
 
 # check if this is an unused argument
-				if ($define_stmt !~ /\b$arg\b/) {
+				if ($define_stmt !~ /\b$arg\b/ && $define_stmt) {
 					WARN("MACRO_ARG_UNUSED",
 					     "Argument '$arg' is not used in function-like macro\n" . "$herectx");
 				}
-- 
2.49.0