linux-kernel - [PATCH] checkpatch: Warn on #defines ending in semicolon

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Date:	Fri, 09 May 2014 14:31:46 -0700
From:	Joe Perches <joe@...ches.com>
To:	Borislav Petkov <bp@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andres Freund <andres@...razel.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Whitcroft <apw@...onical.com>
Subject: [PATCH] checkpatch: Warn on #defines ending in semicolon

Using a #define ending in a semicolon is poor style
and can lead to unexpected code paths being executed.

Warn on uses of these #define types:

	#define foo[(...)] bar;
	#define foo[(...)]	\
		bar;

Original-patch-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 34eb216..3b5651a 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3782,6 +3782,17 @@ sub process {
 					WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
 					     "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
 				}
+			} elsif ($dstat =~ /^\+\s*#\s*define\s+$Ident.*;\s*$/) {
+				$ctx =~ s/\n*$//;
+				my $cnt = statement_rawlines($ctx);
+				my $herectx = $here . "\n";
+
+				for (my $n = 0; $n < $cnt; $n++) {
+					$herectx .= raw_line($linenr, $n) . "\n";
+				}
+
+				WARN("TRAILING_SEMICOLON",
+				     "macros should not use a trailing semicolon\n" . "$herectx");
 			}
 		}
 


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