On Mon, Dec 10, 2007 at 05:02:26PM +0530, Thippeswamy, Aravind wrote:
> I am facing problems while I try to compile a simple "Hello
> World" Kernel module. I am using RHEL 5 (2.6.12.x kernel).
>
> This is the program that I am trying to compile.
>
> /************************* Hello World Kernel Module
> *********************/ #define MODULE #define LINUX #define __KERNEL__
Don't define that, kbuild will do that for you.
>
> #include <linux/module.h> /* Needed by all modules */ #include
> <linux/kernel.h> /* Needed for KERN_ALERT */
>
> int init_module(void)
> {
> printk("<1>Hello world 1.\n");
Use KERN_ALERT instead of "<1>".
> // A non 0 return means init_module failed; module can't be loaded.
> return 0;
> }
>
> void cleanup_module(void)
> {
> printk(KERN_ALERT "Goodbye world 1.\n"); }
>
> MODULE_LICENSE("GPL");
>
> /*************************** End of the Module
> ***************************/
>
> The make file that I am using is
>
> /************************* Hello World Makefile
> *************************/
>
> 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
That should be OK.
> /*************************** End of the Makefile *******************/
>
> The error that I am getting is that
>
> "/lib/modules/$(shell uname -r)/build cannot be found" or something like
> that.
Please be specific with error messages. "Something like that" can be
anything, it's just as annoying as "it doesn't work".
> I did find the "/lib/modules/$(shell uname -r)/build", but there was
> nothing in it. I am facing this only when I try this with RHEL 5 or FC
> 7.
Install the kernel source or header packages. Usually called something
like "linux-xxx-headers" or "linux-xxx-dev" or so.
Erik
--
They're all fools. Don't worry. Darwin may be slow, but he'll
eventually get them. -- Matthew Lammers in alt.sysadmin.recovery
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