From 61439c4ada9fd0e4ce73aca81a71344380a3053b Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Date: Fri, 30 Oct 2020 08:40:22 +0100
Subject: [PATCH] scripts: get_abi.pl: Allow optionally record from where a
 line came from

The get_abi.pl reads a lot of files and can join them on a
single output file. Store where each "What:" output came from,
in order to be able to optionally display it.

This is useful for the Sphinx extension, with can now be
able to blame what ABI file has issues, and on what line
the What: description with problems begin.

Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/befc387011c5e3c6febd285b7f27610e41c90260.1604042072.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 scripts/get_abi.pl | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/scripts/get_abi.pl b/scripts/get_abi.pl
index 0c403af86fd5..6a4d387ebf3b 100755
--- a/scripts/get_abi.pl
+++ b/scripts/get_abi.pl
@@ -10,6 +10,7 @@ use Fcntl ':mode';
 my $help;
 my $man;
 my $debug;
+my $enable_lineno;
 my $prefix="Documentation/ABI";
 
 #
@@ -19,6 +20,7 @@ my $description_is_rst = 0;
 
 GetOptions(
 	"debug|d+" => \$debug,
+	"enable-lineno" => \$enable_lineno,
 	"rst-source!" => \$description_is_rst,
 	"dir=s" => \$prefix,
 	'help|?' => \$help,
@@ -67,6 +69,7 @@ sub parse_abi {
 	$data{$nametag}->{file} = $name;
 	$data{$nametag}->{filepath} = $file;
 	$data{$nametag}->{is_file} = 1;
+	$data{$nametag}->{line_no} = 1;
 
 	my $type = $file;
 	$type =~ s,.*/(.*)/.*,$1,;
@@ -126,6 +129,8 @@ sub parse_abi {
 			if ($tag ne "" && $new_tag) {
 				$tag = $new_tag;
 
+				$data{$what}->{line_no} = $ln;
+
 				if ($new_what) {
 					@{$data{$what}->{label}} = @labels if ($data{$nametag}->{what});
 					@labels = ();
@@ -221,6 +226,12 @@ sub output_rest {
 		my $file = $data{$what}->{file};
 		my $filepath = $data{$what}->{filepath};
 
+		if ($enable_lineno) {
+			printf "#define LINENO %s%s#%s\n\n",
+			       $prefix, $data{$what}->{file},
+			       $data{$what}->{line_no};
+		}
+
 		my $w = $what;
 		$w =~ s/([\(\)\_\-\*\=\^\~\\])/\\$1/g;
 
@@ -369,6 +380,10 @@ sub search_symbols {
 	}
 }
 
+# Ensure that the prefix will always end with a slash
+# While this is not needed for find, it makes the patch nicer
+# with --enable-lineno
+$prefix =~ s,/?$,/,;
 
 #
 # Parses all ABI files located at $prefix dir
@@ -395,7 +410,8 @@ abi_book.pl - parse the Linux ABI files and produce a ReST book.
 
 =head1 SYNOPSIS
 
-B<abi_book.pl> [--debug] [--man] [--help] --[(no-)rst-source] [--dir=<dir>] <COMAND> [<ARGUMENT>]
+B<abi_book.pl> [--debug] [--enable-lineno] [--man] [--help]
+	       [--(no-)rst-source] [--dir=<dir>] <COMAND> [<ARGUMENT>]
 
 Where <COMMAND> can be:
 
@@ -425,6 +441,10 @@ selecting between a rst-compliant source ABI (--rst-source), or a
 plain text that may be violating ReST spec, so it requres some escaping
 logic (--no-rst-source).
 
+=item B<--enable-lineno>
+
+Enable output of #define LINENO lines.
+
 =item B<--debug>
 
 Put the script in verbose mode, useful for debugging. Can be called multiple
-- 
2.11.0