linux-kernel - [PATCH] checkpatch: Add warning for unnamed function definition arguments

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Message-Id: <94fe6378504745991b650f48fc92bb4648f25706.1474925354.git.joe@perches.com>
Date:   Mon, 26 Sep 2016 14:33:57 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Whitcroft <apw@...onical.com>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Julia Lawall <julia.lawall@...6.fr>,
        Josh Triplett <josh@...htriplett.org>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org
Subject: [PATCH] checkpatch: Add warning for unnamed function definition arguments

Function definitions without identifiers like
	 int foo(int)
are not preferred.  Emit a warning when they occur.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 0ef3d837f2aa..3373c65fef1c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5794,6 +5794,19 @@ sub process {
 			     "externs should be avoided in .c files\n" .  $herecurr);
 		}
 
+		if ($realfile =~ /\.[ch]$/ && defined $stat &&
+		    $stat =~ /^.\s*(?:extern\s+)?$Type\s*$Ident\s*\(\s*([^{]+)\s*\)\s*;/s &&
+		    $1 ne "void") {
+			my $args = trim($1);
+			while ($args =~ m/\s*($Type\s*(?:$Ident|\(\s*\*\s*$Ident?\s*\)\s*$balanced_parens)?)/g) {
+				my $arg = trim($1);
+				if ($arg =~ /^$Type$/ && $arg !~ /enum\s+$Ident$/) {
+					WARN("FUNCTION_ARGUMENTS",
+					     "function definition argument '$arg' should also have an identifier name\n" . $herecurr);
+				}
+			}
+		}
+
 # checks for new __setup's
 		if ($rawline =~ /\b__setup\("([^"]*)"/) {
 			my $name = $1;
-- 
2.10.0.rc2.1.g053435c