Makefile not working for kernel module

learningLinux123 · 03-01-2014, 07:20 AM

I have tried creating a make file to run a simple hello world module though keep getting the following error when I input make in the command line:

Code:

make -C /lib/modules/3.5.0-23-generic/build M= modules
make[1]: Entering directory `/usr/src/linux-headers-3.5.0-23-generic'
make[2]: *** No rule to make target `/usr/src/linux-headers-3.5.0-23-generic/arch/x86/syscalls/syscall_32.tbl', needed by `arch/x86/syscalls/../include/generated/asm/unistd_32.h'.  Stop.
make[1]: *** [archheaders] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-23-generic'
make: *** [all] Error 2

I have tried two methods for creating the Makefile though keep getting the same above error:

1:

Code:

obj-m += hello-1.o

all:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

2:

Code:

obj-m += hello-1.o
KDIR = /usr/src/linux-headers-3.5.0-23-generic
all:
        $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
clean:
        rm -rf *.o *.ko *.mod.* *.symvers *.order

Where could I be going wrong I have following some tutorials on creating kernel modules and have followed the tutorials word for word.

knudfl · 03-02-2014, 04:32 PM

This is the basic "module Makefile" :

Code:

obj-m    := hello-1.o

KDIR    := /lib/modules/$(shell uname -r)/build
PWD    := $(shell pwd)

default:
	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

clean:
	rm -f *.o *.ko *.mod.* *.symvers *.order

rahil khera · 03-03-2014, 07:53 AM

In Make file just write :-

Code:

obj-m:= hello-1.o

without any space and run following command

Code:

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

. But Instead of

Code:

 $(PWD)

write the whole path of makefile. Make sure the letter'M' in name of makefile is in Upper Case and also replace

Code:

$(shell uname -r)

with whole path of build, that I suppose in your case would be "3.5.0-23-generic". Make sure your c file and Makefile are in same directory i.e. folder.