Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6

Pull documentation updates from Jonathan Corbet:
 "There's been a fair amount going on in the docs tree this time around,
  including:

   - Support for reproducible document builds, from Ben Hutchings and
     company.

   - The ability to automatically generate cross-reference links within
     a single DocBook book and embedded descriptions for large
     structures.  From Danilo Cesar Lemes de Paula.

   - A new document on how to add a system call from David Drysdale.

   - Chameleon bus documentation from Johannes Thumshirn.

  ...plus the usual collection of improvements, typo fixes, and more"

* tag 'docs-for-linus' of git://git.lwn.net/linux-2.6: (39 commits)
  Documentation, add kernel-parameters.txt entry for dis_ucode_ldr
  Documentation/x86: Rename IRQSTACKSIZE to IRQ_STACK_SIZE
  Documentation/Intel-IOMMU.txt: Modify definition of DRHD
  docs: update HOWTO for 3.x -> 4.x versioning
  kernel-doc: ignore unneeded attribute information
  scripts/kernel-doc: Adding cross-reference links to html documentation.
  DocBook: Fix non-determinstic installation of duplicate man pages
  Documentation: minor typo fix in mailbox.txt
  Documentation: describe how to add a system call
  doc: Add more workqueue functions to the documentation
  ARM: keystone: add documentation for SoCs and EVMs
  scripts/kernel-doc Allow struct arguments documentation in struct body
  SubmittingPatches: remove stray quote character
  Revert "DocBook: Avoid building man pages repeatedly and inconsistently"
  Documentation: Minor changes to men-chameleon-bus.txt
  Doc: fix trivial typo in SubmittingPatches
  MAINTAINERS: Direct Documentation/DocBook/media properly
  Documentation: installed man pages don't need to be executable
  fix Evolution submenu name in email-clients.txt
  Documentation: Add MCB documentation
  ...

1 files changed, 198 insertions, 0 deletions

diff --git a/scripts/kernel-doc-xml-ref b/scripts/kernel-doc-xml-ref
new file mode 100755
index 000000000000..104a5a5ba2c8
--- /dev/null
+++ b/scripts/kernel-doc-xml-ref
@@ -0,0 +1,198 @@
+#!/usr/bin/perl -w
+
+use strict;
+
+## Copyright (C) 2015  Intel Corporation                         ##
+#                                                                ##
+## This software falls under the GNU General Public License.     ##
+## Please read the COPYING file for more information             ##
+#
+#
+# This software reads a XML file and a list of valid interal
+# references to replace Docbook tags with links.
+#
+# The list of "valid internal references" must be one-per-line in the following format:
+#      API-struct-foo
+#      API-enum-bar
+#      API-my-function
+#
+# The software walks over the XML file looking for xml tags representing possible references
+# to the Document. Each reference will be cross checked against the "Valid Internal Reference" list. If
+# the referece is found it replaces its content by a <link> tag.
+#
+# usage:
+# kernel-doc-xml-ref -db filename
+#		     xml filename > outputfile
+
+# read arguments
+if ($#ARGV != 2) {
+	usage();
+}
+
+#Holds the database filename
+my $databasefile;
+my @database;
+
+#holds the inputfile
+my $inputfile;
+my $errors = 0;
+
+my %highlights = (
+	"<function>(.*?)</function>",
+	    "\"<function>\" . convert_function(\$1, \$line) . \"</function>\"",
+	"<structname>(.*?)</structname>",
+	    "\"<structname>\" . convert_struct(\$1) . \"</structname>\"",
+	"<funcdef>(.*?)<function>(.*?)</function></funcdef>",
+	    "\"<funcdef>\" . convert_param(\$1) . \"<function>\$2</function></funcdef>\"",
+	"<paramdef>(.*?)<parameter>(.*?)</parameter></paramdef>",
+	    "\"<paramdef>\" . convert_param(\$1) . \"<parameter>\$2</parameter></paramdef>\"");
+
+while($ARGV[0] =~ m/^-(.*)/) {
+	my $cmd = shift @ARGV;
+	if ($cmd eq "-db") {
+		$databasefile = shift @ARGV
+	} else {
+		usage();
+	}
+}
+$inputfile = shift @ARGV;
+
+sub open_database {
+	open (my $handle, '<', $databasefile) or die "Cannot open $databasefile";
+	chomp(my @lines = <$handle>);
+	close $handle;
+
+	@database = @lines;
+}
+
+sub process_file {
+	open_database();
+
+	my $dohighlight;
+	foreach my $pattern (keys %highlights) {
+		$dohighlight .=  "\$line =~ s:$pattern:$highlights{$pattern}:eg;\n";
+	}
+
+	open(FILE, $inputfile) or die("Could not open $inputfile") or die ("Cannot open $inputfile");
+	foreach my $line (<FILE>)  {
+		eval $dohighlight;
+		print $line;
+	}
+}
+
+sub trim($_)
+{
+	my $str = $_[0];
+	$str =~ s/^\s+|\s+$//g;
+	return $str
+}
+
+sub has_key_defined($_)
+{
+	if ( grep( /^$_[0]$/, @database)) {
+		return 1;
+	}
+	return 0;
+}
+
+# Gets a <function> content and add it a hyperlink if possible.
+sub convert_function($_)
+{
+	my $arg = $_[0];
+	my $key = $_[0];
+
+	my $line = $_[1];
+
+	$key = trim($key);
+
+	$key =~ s/[^A-Za-z0-9]/-/g;
+	$key = "API-" . $key;
+
+	# We shouldn't add links to <funcdef> prototype
+	if (!has_key_defined($key) || $line =~ m/\s+<funcdef/i) {
+		return $arg;
+	}
+
+	my $head = $arg;
+	my $tail = "";
+	if ($arg =~ /(.*?)( ?)$/) {
+		$head = $1;
+		$tail = $2;
+	}
+	return "<link linkend=\"$key\">$head</link>$tail";
+}
+
+# Converting a struct text to link
+sub convert_struct($_)
+{
+	my $arg = $_[0];
+	my $key = $_[0];
+	$key =~ s/(struct )?(\w)/$2/g;
+	$key =~ s/[^A-Za-z0-9]/-/g;
+	$key = "API-struct-" . $key;
+
+	if (!has_key_defined($key)) {
+		return $arg;
+	}
+
+	my ($head, $tail) = split_pointer($arg);
+	return "<link linkend=\"$key\">$head</link>$tail";
+}
+
+# Identify "object *" elements
+sub split_pointer($_)
+{
+	my $arg = $_[0];
+	if ($arg =~ /(.*?)( ?\* ?)/) {
+		return ($1, $2);
+	}
+	return ($arg, "");
+}
+
+sub convert_param($_)
+{
+	my $type = $_[0];
+	my $keyname = convert_key_name($type);
+
+	if (!has_key_defined($keyname)) {
+		return $type;
+	}
+
+	my ($head, $tail) = split_pointer($type);
+	return "<link linkend=\"$keyname\">$head</link>$tail";
+
+}
+
+# DocBook links are in the API-<TYPE>-<STRUCT-NAME> format
+# This method gets an element and returns a valid DocBook reference for it.
+sub convert_key_name($_)
+{
+	#Pattern $2 is optional and might be uninitialized
+	no warnings 'uninitialized';
+
+	my $str = $_[0];
+	$str =~ s/(const|static)? ?(struct)? ?([a-zA-Z0-9_]+) ?(\*|&)?/$2 $3/g ;
+
+	# trim
+	$str =~ s/^\s+|\s+$//g;
+
+	# spaces and _ to -
+	$str =~ s/[^A-Za-z0-9]/-/g;
+
+	return "API-" . $str;
+}
+
+sub usage {
+	print "Usage: $0 -db database filename\n";
+	print "         xml source file(s) > outputfile\n";
+	exit 1;
+}
+
+# starting point
+process_file();
+
+if ($errors) {
+	print STDERR "$errors errors\n";
+}
+
+exit($errors);