Merge tag 'kbuild-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Remove the deprecated rule to build *.dtbo from *.dts

 - Refactor section mismatch detection in modpost

 - Fix bogus ARM section mismatch detections

 - Fix error of 'make gtags' with O= option

 - Add Clang's target triple to KBUILD_CPPFLAGS to fix a build error
   with the latest LLVM version

 - Rebuild the built-in initrd when KBUILD_BUILD_TIMESTAMP is changed

 - Ignore more compiler-generated symbols for kallsyms

 - Fix 'make local*config' to handle the ${CONFIG_FOO} form in Makefiles

 - Enable more kernel-doc warnings with W=2

 - Refactor <linux/export.h> by generating KSYMTAB data by modpost

 - Deprecate <asm/export.h> and <asm-generic/export.h>

 - Remove the EXPORT_DATA_SYMBOL macro

 - Move the check for static EXPORT_SYMBOL back to modpost, which makes
   the build faster

 - Re-implement CONFIG_TRIM_UNUSED_KSYMS with one-pass algorithm

 - Warn missing MODULE_DESCRIPTION when building modules with W=1

 - Make 'make clean' robust against too long argument error

 - Exclude more objects from GCOV to fix CFI failures with GCOV

 - Allow 'make modules_install' to install modules.builtin and
   modules.builtin.modinfo even when CONFIG_MODULES is disabled

 - Include modules.builtin and modules.builtin.modinfo in the
   linux-image Debian package even when CONFIG_MODULES is disabled

 - Revive "Entering directory" logging for the latest Make version

* tag 'kbuild-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (72 commits)
  modpost: define more R_ARM_* for old distributions
  kbuild: revive "Entering directory" for Make >= 4.4.1
  kbuild: set correct abs_srctree and abs_objtree for package builds
  scripts/mksysmap: Ignore prefixed KCFI symbols
  kbuild: deb-pkg: remove the CONFIG_MODULES check in buildeb
  kbuild: builddeb: always make modules_install, to install modules.builtin*
  modpost: continue even with unknown relocation type
  modpost: factor out Elf_Sym pointer calculation to section_rel()
  modpost: factor out inst location calculation to section_rel()
  kbuild: Disable GCOV for *.mod.o
  kbuild: Fix CFI failures with GCOV
  kbuild: make clean rule robust against too long argument error
  script: modpost: emit a warning when the description is missing
  kbuild: make modules_install copy modules.builtin(.modinfo)
  linux/export.h: rename 'sec' argument to 'license'
  modpost: show offset from symbol for section mismatch warnings
  modpost: merge two similar section mismatch warnings
  kbuild: implement CONFIG_TRIM_UNUSED_KSYMS without recursion
  modpost: use null string instead of NULL pointer for default namespace
  modpost: squash sym_update_namespace() into sym_add_exported()
  ...

scripts/kernel-doc

@@ -23,7 +23,7 @@ kernel-doc - Print formatted kernel documentation to stdout
 
 =head1 SYNOPSIS
 
- kernel-doc [-h] [-v] [-Werror]
+ kernel-doc [-h] [-v] [-Werror] [-Wall] [-Wreturn] [-Wshort-description] [-Wcontents-before-sections]
    [ -man |
      -rst [-sphinx-version VERSION] [-enable-lineno] |
      -none
@@ -133,6 +133,9 @@ my $dohighlight = "";
 
 my $verbose = 0;
 my $Werror = 0;
+my $Wreturn = 0;
+my $Wshort_desc = 0;
+my $Wcontents_before_sections = 0;
 my $output_mode = "rst";
 my $output_preformatted = 0;
 my $no_doc_sections = 0;
@@ -187,9 +190,14 @@ if (defined($ENV{'KCFLAGS'})) {
 	}
 }
 
+# reading this variable is for backwards compat just in case
+# someone was calling it with the variable from outside the
+# kernel's build system
 if (defined($ENV{'KDOC_WERROR'})) {
 	$Werror = "$ENV{'KDOC_WERROR'}";
 }
+# other environment variables are converted to command-line
+# arguments in cmd_checkdoc in the build system
 
 # Generated docbook code is inserted in a template at a point where
 # docbook v3.1 requires a non-zero sequence of RefEntry's; see:
@@ -318,6 +326,16 @@ while ($ARGV[0] =~ m/^--?(.*)/) {
 	$verbose = 1;
     } elsif ($cmd eq "Werror") {
 	$Werror = 1;
+    } elsif ($cmd eq "Wreturn") {
+	$Wreturn = 1;
+    } elsif ($cmd eq "Wshort-desc") {
+	$Wshort_desc = 1;
+    } elsif ($cmd eq "Wcontents-before-sections") {
+	$Wcontents_before_sections = 1;
+    } elsif ($cmd eq "Wall") {
+        $Wreturn = 1;
+        $Wshort_desc = 1;
+        $Wcontents_before_sections = 1;
     } elsif (($cmd eq "h") || ($cmd eq "help")) {
 		pod2usage(-exitval => 0, -verbose => 2);
     } elsif ($cmd eq 'no-doc-sections') {
@@ -1748,9 +1766,9 @@ sub dump_function($$) {
     # This check emits a lot of warnings at the moment, because many
     # functions don't have a 'Return' doc section. So until the number
     # of warnings goes sufficiently down, the check is only performed in
-    # verbose mode.
+    # -Wreturn mode.
     # TODO: always perform the check.
-    if ($verbose && !$noret) {
+    if ($Wreturn && !$noret) {
 	    check_return_section($file, $declaration_name, $return_type);
     }
 
@@ -2054,7 +2072,7 @@ sub process_name($$) {
 	    $state = STATE_NORMAL;
 	}
 
-	if (($declaration_purpose eq "") && $verbose) {
+	if (($declaration_purpose eq "") && $Wshort_desc) {
 	    emit_warning("${file}:$.", "missing initial short description on line:\n$_");
 	}
 
@@ -2103,7 +2121,7 @@ sub process_body($$) {
 	}
 
 	if (($contents ne "") && ($contents ne "\n")) {
-	    if (!$in_doc_sect && $verbose) {
+	    if (!$in_doc_sect && $Wcontents_before_sections) {
 		emit_warning("${file}:$.", "contents before sections\n");
 	    }
 	    dump_section($file, $section, $contents);