add menuconfig option for enabling debugfs support in the kernel

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17540 3c298f89-4303-0410-b956-a3cf2f4a3e73

Config.in

@@ -195,13 +195,23 @@ config KERNEL_KALLSYMS
 	default n
 	help
 		This will give you more information in stack traces from kernel oopses
+
 config KERNEL_PROFILING
 	bool "Compile the kernel with profiling enabled"
 	default n
 	help
 		Enable the extended profiling support mechanisms used by profilers such
 		as OProfile.
 
+config KERNEL_DEBUG_FS
+	bool "Compile the kernel with Debug Filesystem enabled"
+	depends LINUX_2_6
+	default y
+	help
+		debugfs is a virtual file system that kernel developers use to put
+		debugging files into. Enable this option to be able to read and
+		write to these files.
+
 endmenu
 
 menuconfig DEVEL

include/kernel-defaults.mk

@@ -97,6 +97,7 @@ define Kernel/Configure/Default
 	$(LINUX_CONFCMD) > $(LINUX_DIR)/.config.target
 	echo "$(if $(CONFIG_KERNEL_KALLSYMS),CONFIG_KALLSYMS=y,# CONFIG_KALLSYMS is not set)" >> $(LINUX_DIR)/.config.target
 	echo "$(if $(CONFIG_KERNEL_PROFILING),CONFIG_PROFILING=y,# CONFIG_PROFILING is not set)" >> $(LINUX_DIR)/.config.target
+	echo "$(if $(CONFIG_KERNEL_DEBUG_FS),CONFIG_DEBUG_FS=y,# CONFIG_DEBUG_FS is not set)" >> $(LINUX_DIR)/.config.target
 	echo "# CONFIG_KALLSYMS_EXTRA_PASS is not set" >> $(LINUX_DIR)/.config.target
 	echo "# CONFIG_KALLSYMS_ALL is not set" >> $(LINUX_DIR)/.config.target
 	echo "# CONFIG_KPROBES is not set" >> $(LINUX_DIR)/.config.target