[RFC] scripts: kernel-doc: avoid warnings due to initial commented lines in file

[Aditya Srivastava <yashsri421@gmail.com>]

Starting commented lines in a file mostly contains comments describing
license, copyright or general information about the file.

E.g., in sound/pci/ctxfi/ctresource.c, initial comment lines describe
its copyright and other related file informations.

But as kernel-doc reads these lines, it results in ineffective warnings by
kernel-doc, related to these.

Provide a simple fix by skipping first three lines in a file for checking
kernel-doc comments.

Suggested-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
---
 scripts/kernel-doc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index e1e562b2e2e7..431add05248e 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -2375,6 +2375,7 @@ sub process_file($) {
     my $file;
     my $initial_section_counter = $section_counter;
     my ($orig_file) = @_;
+    my $lineno = 0;	# to maintain the count of line number in a file
 
     $file = map_filename($orig_file);
 
@@ -2388,13 +2389,16 @@ sub process_file($) {
 
     $section_counter = 0;
     while (<IN_FILE>) {
+	$lineno++;
 	while (s/\\\s*$//) {
 	    $_ .= <IN_FILE>;
+	    $lineno++;
 	}
 	# Replace tabs by spaces
         while ($_ =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {};
 	# Hand this line to the appropriate state handler
-	if ($state == STATE_NORMAL) {
+	if ($state == STATE_NORMAL
+	    && $lineno > 3) {	# to avoid starting comment lines describing the file
 	    process_normal();
 	} elsif ($state == STATE_NAME) {
 	    process_name($file, $_);
-- 
2.17.1