I am working with a kernel module that has a few kconfig options associated with it. The makefile for the module as it is does not support out-of-tree builds. I am trying to change the the makefile to do out-of-tree builds. Most of this is pretty straight forward, however I can't seem to find any recomendations on to do local configurations for just the out of tree build. right now I use the code below, but I don't realy think it is a good solution because of the possible confilict between the local .config file and the kernel .config file. Any suggestions on how I should handle this? ifneq ($(KERNELRELEASE),) # kbuild part of makefile # Optionally, include config file to allow out of tree kernel modules build -include $(src)/.config # Core module obj-$(CONFIG_XXX) += xxx.o xxx-y += xxx-core.o xxx-sysfs.o # drivers obj-$(CONFIG_XXX_1) += xxx1.o obj-$(CONFIG_XXX_2) += xxx2.o else # normal makefile KDIR ?= /lib/modules/`uname -r`/build default: .config $(MAKE) -C $(KDIR) M=$$PWD modules .config: @echo need local .config exit 1 modules_install: $(MAKE) -C $(KDIR) M=$$PWD modules_install clean: rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions \ modules.order Module.symvers endif