fedora linux --- compiling first linux module

Question

Getting error while compiling my first kernel module in Fedora linux.

Source code :--

#include <linux/module.h>       /* Needed by all modules */
#include <linux/kernel.h>       /* Needed for KERN_INFO */
#include <linux/init.h>         /* Needed for the macros */
static int __init hello_start(void)
{
printk(KERN_INFO "Loading hello module...\n");
printk(KERN_INFO "Hello world\n");
return 0;
}
static void __exit hello_end(void)
{
printk(KERN_INFO "Goodbye Mr.\n");
}
module_init(hello_start);
module_exit(hello_end);

Makefile :----

obj-m = hello.o
KVERSION = $(shell uname -r)
all:
    make -C /lib/modules/$(KVERSION)/build M=$(PWD) modules
clean:
    make -C /lib/modules/$(KVERSION)/build M=$(PWD) clean

error at make time :--

$ make
make -C /lib/modules/3.8.6-203.fc18.x86_64/build M=/home/dinesh/development/linux/kernel_modules/hello modules
make: *** /lib/modules/3.8.6-203.fc18.x86_64/build: No such file or directory.  Stop.
make: *** [default] Error 2

Now if i see build is there or not , i get following o/p. Build is shown as an softlink :---

$ ls -l /lib/modules/3.8.6-203.fc18.x86_64/
total 2632
lrwxrwxrwx.  1 root root     38 Apr 15 21:32 build -> /usr/src/kernels/3.8.6-203.fc18.x86_64
drwxr-xr-x. 

I got same error even after installing, kernel-devel :--

My makefile is correct it have correct tab before rule. Please suggest how to resolve this error ?

Answer 1

As guido said, you have to match your current kernel and the kernel-devel package.

To get your kernel version run

uname -r

I get 3.6.10-4.fc18.x86_64, download that kernel-devel version

sudo yum install kernel-devel-3.6.10-4.fc18

Or update your system and boot with the new kernel, I believe those two will automatically match.