[PATCH] headers_check.pl: disallow extern's

[Mike Frysinger <vapier@gentoo.org>]

Since prototypes with "extern" refer to kernel functions, they make no
sense in userspace, so reject them automatically.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 scripts/headers_check.pl |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/scripts/headers_check.pl b/scripts/headers_check.pl
index 488a3b1..15b9bc6 100644
--- a/scripts/headers_check.pl
+++ b/scripts/headers_check.pl
@@ -33,6 +33,7 @@ foreach my $file (@files) {
 	while ($line = <FH>) {
 		$lineno++;
 		check_include();
+		check_prototypes();
 	}
 	close FH;
 }
@@ -54,3 +55,11 @@ sub check_include
 		}
 	}
 }
+
+sub check_prototypes
+{
+	if ($line =~ m/^\s*extern\b/) {
+		printf STDERR "$filename:$lineno: extern's make no sense in userspace\n";
+		$ret = 1;
+	}
+}
-- 
1.6.0.6