From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>

Begin infrastructure for kernel code samples in the samples/ directory.
Add its Kconfig and Kbuild files.
Source its Kconfig file in all arch/ Kconfigs.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


diff -puN Makefile~add-samples-subdir Makefile
--- a/Makefile~add-samples-subdir
+++ a/Makefile
@@ -772,6 +772,9 @@ vmlinux: $(vmlinux-lds) $(vmlinux-init) 
 ifdef CONFIG_HEADERS_CHECK
 	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 endif
+ifdef CONFIG_SAMPLES
+	$(Q)$(MAKE) $(build)=samples
+endif
 	$(call vmlinux-modpost)
 	$(call if_changed_rule,vmlinux__)
 	$(Q)rm -f .old_version
diff -puN lib/Kconfig.debug~add-samples-subdir lib/Kconfig.debug
--- a/lib/Kconfig.debug~add-samples-subdir
+++ a/lib/Kconfig.debug
@@ -521,3 +521,5 @@ config FAULT_INJECTION_STACKTRACE_FILTER
 	  Provide stacktrace filter for fault-injection capabilities
 
 source "lib/Kconfig.kgdb"
+
+source "samples/Kconfig"
diff -puN /dev/null samples/Kconfig
--- /dev/null
+++ a/samples/Kconfig
@@ -0,0 +1,11 @@
+# samples/Kconfig
+
+menuconfig SAMPLES
+	bool "Sample kernel code"
+	help
+	  You can build and test sample kernel code here.
+
+if SAMPLES
+
+
+endif # SAMPLES
_