Re: problems compiling kernel module

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Apr 19, 2006 at 09:44:08AM -0400, Fernando Barsoba wrote:
> I am really stuck with this thing.. For couple of days i have been 
> trying to compile a kernel module. I have been following the info in 
> http://www.faqs.org/docs/kernel/x204.html. But no success... i 
> recompiled the latest kernel version, and i think i trying to compile 
> the module against the source code for that kernel.. however, strange 
> errors appear.

That way just doesn't work. Use kbuild instead of brewing your own
Makefiles. See http://lwn.net/Articles/21823/ .

> And here are the files:
> 
> Code:
> 
> /* hello-1.c - The simplest kernel module.
> */ #include <linux/module.h> /* Needed by all modules

Not necessary, IIRC.

> */ #include <linux/kernel.h> /* Needed for KERN_ALERT */

OK...

> int init_module(void) {
> printk("<1>Hello world 1.\n"); // A non 0 return means init_module 

... so why don't you use KERN_ALERT instead of <1>?

Make that printk(KERN_ALERT "Hello, world!\n");

> failed; module can't be loaded.
> return 0;
> }
> 
> void cleanup_module(void) {
> printk(KERN_ALERT "Goodbye world 1.\n");
> }
> 
> 
> Code:
> 
> TARGET := hello-1
> WARN := -W -Wall -Wstrict-prototypes -Wmissing-prototypes
> INCLUDE := -isystem /lib/modules/`uname -r`/build/include
> CFLAGS := -O2 -DMODULE -D__KERNEL__ ${WARN} ${INCLUDE} CC := gcc
> ${TARGET}.o: ${TARGET}.c
> .PHONY: clean
> clean: rm -rf {TARGET}.o

You want something like:

ifneq ($(KERNELRELEASE),)
obj-m	:= hello.o
else
KDIR	:= /lib/modules/$(shell uname -r)/build
PWD		:= $(shell pwd)

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


Erik

-- 
+-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 --
| Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux