kernel-doc: allow multi-line declaration purpose descriptions

Allow the short description after symbol name and dash in a kernel-doc
comment to span multiple lines, e.g. like this:

	/**
	 * unmap_mapping_range - unmap the portion of all mmaps in the
	 *	specified address_space corresponding to the specified
	 *	page range in the underlying file.
	 * @mapping: the address space containing mmaps to be unmapped.
	 * ...
	 */

The short description ends with a parameter description, an empty line
or the end of the comment block.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/kernel-doc-nano-HOWTO.txt b/Documentation/kernel-doc-nano-HOWTO.txt
index 4d04572..348b9e5 100644 (file)
--- a/Documentation/kernel-doc-nano-HOWTO.txt
+++ b/Documentation/kernel-doc-nano-HOWTO.txt
@@ -66,7 +66,9 @@ Example kernel-doc function comment:
  * The longer description can have multiple paragraphs.
  */
 
-The first line, with the short description, must be on a single line.
+The short description following the subject can span multiple lines
+and ends with an @argument description, an empty line or the end of
+the comment block.
 
 The @argument descriptions must begin on the very next line following
 this opening short function description line, with no intervening

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index b52d340..ea9f8a5 100755 (executable)
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1995,6 +1995,7 @@ sub process_file($) {
     my $identifier;
     my $func;
     my $descr;
+    my $in_purpose = 0;
     my $initial_section_counter = $section_counter;
 
     if (defined($ENV{'SRCTREE'})) {
@@ -2044,6 +2045,7 @@ sub process_file($) {
                    $descr =~ s/\s*$//;
                    $descr =~ s/\s+/ /;
                    $declaration_purpose = xml_escape($descr);
+                   $in_purpose = 1;
                } else {
                    $declaration_purpose = "";
                }
@@ -2090,6 +2092,7 @@ sub process_file($) {
                }
 
                $in_doc_sect = 1;
+               $in_purpose = 0;
                $contents = $newcontents;
                if ($contents ne "") {
                    while ((substr($contents, 0, 1) eq " ") ||
@@ -2119,11 +2122,19 @@ sub process_file($) {
            } elsif (/$doc_content/) {
                # miguel-style comment kludge, look for blank lines after
                # @parameter line to signify start of description
-               if ($1 eq "" &&
-                       ($section =~ m/^@/ || $section eq $section_context)) {
-                   dump_section($file, $section, xml_escape($contents));
-                   $section = $section_default;
-                   $contents = "";
+               if ($1 eq "") {
+                   if ($section =~ m/^@/ || $section eq $section_context) {
+                       dump_section($file, $section, xml_escape($contents));
+                       $section = $section_default;
+                       $contents = "";
+                   } else {
+                       $contents .= "\n";
+                   }
+                   $in_purpose = 0;
+               } elsif ($in_purpose == 1) {
+                   # Continued declaration purpose
+                   chomp($declaration_purpose);
+                   $declaration_purpose .= " " . xml_escape($1);
                } else {
                    $contents .= $1 . "\n";
                }