Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

Pull kbuild changes from Michal Marek:
 - cleanups in the main Makefiles and Documentation/DocBook/Makefile
 - make O=...  directory is automatically created if needed
 - mrproper/distclean removes the old include/linux/version.h to make
   life easier when bisecting across the commit that moved the version.h
   file

* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  kbuild: docbook: fix the include error when executing "make help"
  kbuild: create a build directory automatically for out-of-tree build
  kbuild: remove redundant '.*.cmd' pattern from make distclean
  kbuild: move "quote" to Kbuild.include to be consistent
  kbuild: docbook: use $(obj) and $(src) rather than specific path
  kbuild: unconditionally clobber include/linux/version.h on distclean
  kbuild: docbook: specify KERNELDOC dependency correctly
  kbuild: docbook: include cmd files more simply
  kbuild: specify build_docproc as a phony target

Documentation/DocBook/Makefile

@@ -16,7 +16,7 @@ DOCBOOKS := z8530book.xml device-drivers.xml \
 	    alsa-driver-api.xml writing-an-alsa-driver.xml \
 	    tracepoint.xml drm.xml media_api.xml w1.xml
 
-include $(srctree)/Documentation/DocBook/media/Makefile
+include Documentation/DocBook/media/Makefile
 
 ###
 # The build process is as follows (targets):
@@ -36,6 +36,7 @@ PS_METHOD	= $(prefer-db2x)
 # The targets that may be used.
 PHONY += xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs cleandocs
 
+targets += $(DOCBOOKS)
 BOOKS := $(addprefix $(obj)/,$(DOCBOOKS))
 xmldocs: $(BOOKS)
 sgmldocs: xmldocs
@@ -58,14 +59,14 @@ mandocs: $(MAN)
 
 installmandocs: mandocs
 	mkdir -p /usr/local/man/man9/
-	install Documentation/DocBook/man/*.9.gz /usr/local/man/man9/
+	install $(obj)/man/*.9.gz /usr/local/man/man9/
 
 ###
 #External programs used
 KERNELDOC = $(srctree)/scripts/kernel-doc
 DOCPROC   = $(objtree)/scripts/docproc
 
-XMLTOFLAGS = -m $(srctree)/Documentation/DocBook/stylesheet.xsl
+XMLTOFLAGS = -m $(srctree)/$(src)/stylesheet.xsl
 XMLTOFLAGS += --skip-validation
 
 ###
@@ -87,21 +88,9 @@ define rule_docproc
         ) > $(dir $@).$(notdir $@).cmd
 endef
 
-%.xml: %.tmpl FORCE
+%.xml: %.tmpl $(KERNELDOC) $(DOCPROC) FORCE
 	$(call if_changed_rule,docproc)
 
-###
-#Read in all saved dependency files
-cmd_files := $(wildcard $(foreach f,$(BOOKS),$(dir $(f)).$(notdir $(f)).cmd))
-
-ifneq ($(cmd_files),)
-  include $(cmd_files)
-endif
-
-###
-# Changes in kernel-doc force a rebuild of all documentation
-$(BOOKS): $(KERNELDOC)
-
 # Tell kbuild to always build the programs
 always := $(hostprogs-y)
 
@@ -139,7 +128,7 @@ quiet_cmd_db2pdf = PDF     $@
 
 
 index = index.html
-main_idx = Documentation/DocBook/$(index)
+main_idx = $(obj)/$(index)
 build_main_index = rm -rf $(main_idx); \
 		   echo '<h1>Linux Kernel HTML Documentation</h1>' >> $(main_idx) && \
 		   echo '<h2>Kernel Version: $(KERNELVERSION)</h2>' >> $(main_idx) && \
@@ -148,7 +137,7 @@ build_main_index = rm -rf $(main_idx); \
 quiet_cmd_db2html = HTML    $@
       cmd_db2html = xmlto html $(XMLTOFLAGS) -o $(patsubst %.html,%,$@) $< && \
 		echo '<a HREF="$(patsubst %.html,%,$(notdir $@))/index.html"> \
-        $(patsubst %.html,%,$(notdir $@))</a><p>' > $@
+		$(patsubst %.html,%,$(notdir $@))</a><p>' > $@
 
 %.html:	%.xml
 	@(which xmlto > /dev/null 2>&1) || \