+ checkpatch-dont-warn-about-unused-macro-arg-on-empty-body.patch added to mm-nonmm-unstable branch

+ checkpatch-dont-warn-about-unused-macro-arg-on-empty-body.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: checkpatch: dont warn about unused macro arg on empty body
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     checkpatch-dont-warn-about-unused-macro-arg-on-empty-body.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/checkpatch-dont-warn-about-unused-macro-arg-on-empty-body.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Jim Cromie <jim.cromie@gmail.com>
Subject: checkpatch: dont warn about unused macro arg on empty body
Date: Tue, 25 Mar 2025 17:51:54 -0600

Patch series "2 checkpatch fixes, one pr_info_once".

2 small tweaks to checkpatch,
1 reducing several pages of powernow "not-relevant-here" log-msgs to a few lines


This patch (of 3):

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.

Link: https://lkml.kernel.org/r/20250325235156.663269-1-jim.cromie@gmail.com
Link: https://lkml.kernel.org/r/20250325235156.663269-2-jim.cromie@gmail.com
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Joe Perches <joe@perches.com>
Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Joe Perches <joe@perches.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc:"Rafael J. Wysocki" <rafael@kernel.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 scripts/checkpatch.pl |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/scripts/checkpatch.pl~checkpatch-dont-warn-about-unused-macro-arg-on-empty-body
+++ a/scripts/checkpatch.pl
@@ -6038,7 +6038,7 @@ 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");
 				}
_

Patches currently in -mm which might be from jim.cromie@gmail.com are

checkpatch-dont-warn-about-unused-macro-arg-on-empty-body.patch
checkpatch-qualify-do-while-0-advice.patch
powernow-use-pr_info_once.patch