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;

Based on a patch from Borislav Petkov.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index bb4c842..e7ff52a 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3821,6 +3821,17 @@ 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");
                        }
                }