Linux Kernel Makefiles

I want to distribute my make environment into several sub-dirs. These are modules to the kernel, but all the sub-dirs will be out-of-stream builds. I was attempting to mimic the way the Linux kernel build works, but something is seriously missing from these files. The main directory make file looks something like this:

Code:

---

ifeq ($(KERNELRELEASE), )
KERNELDIR      ?= ../../../kernel/linux-2.6.24.5/linux-2.6.24.5
ARCH            ?= arm
CROSS_COMPILE  ?= arm-unknown-linux-gnueabi-
PWD            := $(shell pwd)

modules:
        $(MAKE) -C $(KERNELDIR) M=$(PWD) modules

else

EXTRA_CFLAGS    += -I$(PWD)/include
obj-y          += common/
obj-y          += convert/
obj-y          += drivers/

endif

---

One of the sub-dir Makefiles looks like this:

Code:

---

obj-y  += safe_inc.o
obj-y  += callback.o safe_inc.o

---

So, what am I doing wrong? Any ideas?

Doh!!! I think I found it. I may need more work, but here is the bottom line:

All the obj-y stuff, should be replaced with obj-m (Modules, man, Modules!!!!).

I'll post more if I find more corrections.

Code:

---

ifeq ($(KERNELRELEASE), )
KERNELDIR        ?= <path to kernel>
ARCH              ?= <if you are using a different arch>
CROSS_COMPILE    ?= <your cross compiler>
PWD              := $(shell pwd)

modules:
        @$(MAKE) MYPWD=$(PWD) -C $(KERNELDIR) M=$(PWD) modules

clean:
        @rm -r *.o */*.o *.ko *.mod.c .*cmd */.*cmd .tmp_versions Module.symvers

else
EXTRA_CFLAGS      := -I$(MYPWD)/include

obj-m            += mydriver.o
mydriver-y        := drivers/mydriver.o
mydriver-y        += common/some.o

obj-m                  += mydriver2.o
mydriver2-y      := drivers/mydriver2.o
mydriver2-y      += common/callback.o
mydriver2-y      += convert/mydriver2.o
mydriver2-y      += common/mymemory.o
mydriver2-y      += common/some.o

#etc. . .

endif

---