cannot create kernel objects of kernel modules .c files

itz2000 · 05-28-2008, 03:17 PM

Hey guys,
I was trying to create .ko file out of .c file, so I can load it to the kernel as a kernel module... but it doesn't go okay for me :

I got this file in my CWD :
test1.c
which contains my simple LKM (Linux loadable Kernel Module)
and I got this MakeFile

Code:

obj-m += test1.o

but when I try to create the .ko file I get (as root)

Code:

root@me:/home/zuki/programming/kernel_poc# make -C /usr/src/linux-2.6.24.5 SUBDIRS=/home/zuki/programming/kernel_poc/ modules
make: Entering directory `/usr/src/linux-2.6.24.5'
scripts/Makefile.build:41: /home/zuki/programming/kernel_poc/Makefile: No such file or directory
make[1]: *** No rule to make target `/home/zuki/programming/kernel_poc/Makefile'.  Stop.
make: *** [_module_/home/zuki/programming/kernel_poc] Error 2
make: Leaving directory `/usr/src/linux-2.6.24.5'

the test1.ko isn't created in the CWD...

Do you see what I'm doing wrong?

osor · 05-28-2008, 03:44 PM

Quote:

Originally Posted by itz2000

and I got this MakeFile

Linux kernel Makefiles are very picky. They will not work unless they are exactly named “Makefile” or “Kbuild”. The names “makefile” and “MakeFile” will not work.

osor · 05-28-2008, 03:47 PM

Also, it is recommended to build your modules as an ordinary user (not root).

digvijay.gahlot · 05-29-2008, 07:19 AM

Make a Makefile with following content in you current working directory and the type make on shell.

obj-m := test1.o
KERNELDIR ?= /usr/src/linux-2.6.24.5
PWD := $(shell pwd)
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
endif