samples: move blackfin gptimers-example from Documentation

Move blackfin gptimers-example to samples and remove it from Documentation
Makefile. Update samples Kconfig and Makefile to build gptimers-example.

blackfin is the last CONFIG_BUILD_DOCSRC target in Documentation/Makefile.
Hence this patch also includes changes to remove CONFIG_BUILD_DOCSRC from
Makefile and lib/Kconfig.debug and updates VIDEO_PCI_SKELETON dependency
on BUILD_DOCSRC.

Documentation/Makefile is not deleted to avoid braking make htmldocs and
make distclean.

Acked-by: Michal Marek <mmarek@suse.com>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reported-by: Valentin Rothberg <valentinrothberg@gmail.com>
Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

Documentation/Makefile

@@ -1 +1 @@
-subdir-y := blackfin
+subdir-y :=

Documentation/blackfin/00-INDEX

@@ -1,10 +1,6 @@
 00-INDEX
 	- This file
-Makefile
-	- Makefile for gptimers example file.
 bfin-gpio-notes.txt
 	- Notes in developing/using bfin-gpio driver.
 bfin-spi-notes.txt
 	- Notes for using bfin spi bus driver.
-gptimers-example.c
-	- gptimers example

Documentation/blackfin/Makefile

@@ -1,5 +0,0 @@
-ifneq ($(CONFIG_BLACKFIN),)
-ifneq ($(CONFIG_BFIN_GPTIMERS),)
-obj-m := gptimers-example.o
-endif
-endif

Makefile

@@ -933,9 +933,6 @@ vmlinux_prereq: $(vmlinux-deps) FORCE
 ifdef CONFIG_HEADERS_CHECK
 	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 endif
-ifdef CONFIG_BUILD_DOCSRC
-	$(Q)$(MAKE) $(build)=Documentation
-endif
 ifdef CONFIG_GDB_SCRIPTS
 	$(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
 endif

drivers/media/v4l2-core/Kconfig

@@ -27,7 +27,7 @@ config VIDEO_FIXED_MINOR_RANGES
 
 config VIDEO_PCI_SKELETON
 	tristate "Skeleton PCI V4L2 driver"
-	depends on PCI && BUILD_DOCSRC
+	depends on PCI
 	depends on VIDEO_V4L2 && VIDEOBUF2_CORE
 	depends on VIDEOBUF2_MEMOPS && VIDEOBUF2_DMA_CONTIG
 	---help---

lib/Kconfig.debug

@@ -1875,15 +1875,6 @@ config PROVIDE_OHCI1394_DMA_INIT
 
 	  See Documentation/debugging-via-ohci1394.txt for more information.
 
-config BUILD_DOCSRC
-	bool "Build targets in Documentation/ tree"
-	depends on HEADERS_CHECK
-	help
-	  This option attempts to build objects from the source files in the
-	  kernel Documentation/ tree.
-
-	  Say N if you are unsure.
-
 config DMA_API_DEBUG
 	bool "Enable debugging of DMA-API usage"
 	depends on HAVE_DMA_API_DEBUG

samples/Kconfig

@@ -99,4 +99,10 @@ config SAMPLE_SECCOMP
 	  Build samples of seccomp filters using various methods of
 	  BPF filter construction.
 
+config SAMPLE_BLACKFIN_GPTIMERS
+	tristate "Build blackfin gptimers sample code -- loadable modules only"
+	depends on BLACKFIN && BFIN_GPTIMERS && m
+	help
+	  Build samples of blackfin gptimers sample module.
+
 endif # SAMPLES

samples/Makefile

@@ -2,4 +2,4 @@
 
 obj-$(CONFIG_SAMPLES)	+= kobject/ kprobes/ trace_events/ livepatch/ \
 			   hw_breakpoint/ kfifo/ kdb/ hidraw/ rpmsg/ seccomp/ \
-			   configfs/ connector/ v4l/ trace_printk/
+			   configfs/ connector/ v4l/ trace_printk/ blackfin/

samples/blackfin/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_SAMPLE_BLACKFIN_GPTIMERS) += gptimers-example.o