checkincludes.pl: provide usage helper
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/checkincludes.pl b/scripts/checkincludes.pl
index 32ebff6..4bff139 100755
--- a/scripts/checkincludes.pl
+++ b/scripts/checkincludes.pl
@@ -3,6 +3,15 @@
# checkincludes: Find files included more than once in (other) files.
# Copyright abandoned, 2000, Niels Kristian Bech Jensen <nkbj@image.dk>.
+sub usage {
+ print "Usage: checkincludes.pl <file list>\n";
+ exit 1;
+}
+
+if ($#ARGV < 0) {
+ usage();
+}
+
foreach $file (@ARGV) {
open(FILE, $file) or die "Cannot open $file: $!.\n";