[PATCHv4] [KERNEL-DOC] kill warnings when building mandocs (final)

[Borislav Petkov <bbpetkov@yahoo.de>]

We were simply reinventing the wheel until now. Here's the final version of the
patch which is also the simplest solution (if you hold your eyes open at all
time, you'll see that KERNELVERSION is already exported by the main Makefile and
there's no need for changing the build string in Documentation/DocBook/Makefile):

-----
From: Borislav Petkov <bbpetkov@yahoo.de>

This patch shuts warnings of the sort:

make -C /mnt/samsung_200/sam/kernel/trees/21-rc6/build \
        KBUILD_SRC=/mnt/samsung_200/sam/kernel/trees/21-rc6 \
        KBUILD_EXTMOD="" -f /mnt/samsung_200/sam/kernel/trees/21-rc6/Makefile mandocs
make -f /mnt/samsung_200/sam/kernel/trees/21-rc6/scripts/Makefile.build obj=scripts/basic
make -f /mnt/samsung_200/sam/kernel/trees/21-rc6/scripts/Makefile.build obj=Documentation/DocBook mandocs
  SRCTREE=/mnt/samsung_200/sam/kernel/trees/21-rc6/ /mnt/samsung_200/sam/kernel/trees/21-rc6/build/scripts/basic/docproc doc
 /mnt/samsung_200/sam/kernel/trees/21-rc6/Documentation/DocBook/wanbook.tmpl >Documentation/DocBook/wanbook.xml
  if grep -q refentry Documentation/DocBook/wanbook.xml; then xmlto man -m /mnt/samsung_200/sam/kernel/trees/21-rc6/Documentation/DocBook/stylesheet.xsl -o
 Documentation/DocBook/man Documentation/DocBook/wanbook.xml ; gzip -f Documentation/DocBook/man/*.9; fi
Note: meta version: No productnumber or alternative     sppp_close
Note: meta version: No refmiscinfo@class=version        sppp_close
Note: Writing sppp_close.9
Note: meta version: No productnumber or alternative     sppp_open
Note: meta version: No refmiscinfo@class=version        sppp_open

by adding a RefMiscInfo xml tag in the form of the current kernel version to
the function, struct and enum definitions in files included by kernel-doc when
building 'mandocs'.  However, the version string appears truncated on the manpage
due to some constraints in the xml DTD for the man header, I believe, for the
troff output is truncated too.

The current patch improves upon previous versions by reading the kernel version
directly from the enclosing build environment exported by the main Makefile.

Signed-off-by: Borislav Petkov <bbpetkov@yahoo.de>
CC: Randy Dunlap <randy.dunlap@oracle.com>

---
Index: 21-rc7/scripts/kernel-doc
===================================================================
--- 21-rc7.orig/scripts/kernel-doc
+++ 21-rc7/scripts/kernel-doc
@@ -326,6 +326,15 @@ while ($ARGV[0] =~ m/^-(.*)/) {
     }
 }
 
+# get kernel version from env
+sub get_kernel_version() {
+    my $version;
+
+    if (defined($ENV{'KERNELVERSION'})) {
+	$version = $ENV{'KERNELVERSION'};
+    }
+    return $version;
+}
 
 # generate a sequence of code that will splice in highlighting information
 # using the s// operator.
@@ -592,6 +601,7 @@ sub output_function_xml(%) {
     print "<refmeta>\n";
     print " <refentrytitle><phrase>".$args{'function'}."</phrase></refentrytitle>\n";
     print " <manvolnum>9</manvolnum>\n";
+    print " <refmiscinfo class=\"version\">" . get_kernel_version() . "</refmiscinfo>\n";
     print "</refmeta>\n";
     print "<refnamediv>\n";
     print " <refname>".$args{'function'}."</refname>\n";
@@ -668,6 +678,7 @@ sub output_struct_xml(%) {
     print "<refmeta>\n";
     print " <refentrytitle><phrase>".$args{'type'}." ".$args{'struct'}."</phrase></refentrytitle>\n";
     print " <manvolnum>9</manvolnum>\n";
+    print " <refmiscinfo class=\"version\">" . get_kernel_version() . "</refmiscinfo>\n";
     print "</refmeta>\n";
     print "<refnamediv>\n";
     print " <refname>".$args{'type'}." ".$args{'struct'}."</refname>\n";
@@ -752,6 +763,7 @@ sub output_enum_xml(%) {
     print "<refmeta>\n";
     print " <refentrytitle><phrase>enum ".$args{'enum'}."</phrase></refentrytitle>\n";
     print " <manvolnum>9</manvolnum>\n";
+    print " <refmiscinfo class=\"version\">" . get_kernel_version() . "</refmiscinfo>\n";
     print "</refmeta>\n";
     print "<refnamediv>\n";
     print " <refname>enum ".$args{'enum'}."</refname>\n";
-- 
Regards/Gruß,
    Boris.
-
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