Kernel module compilation errors

[Matt M]

I actually found this, which was exactly what I needed.

On Thu, Aug 11, 2016 at 4:50 PM Matt M <cmorrow132 at gmail.com> wrote:

> Thank you
>
> On Thu, Aug 11, 2016 at 7:40 PM Greg KH <greg at kroah.com> wrote:
>
>> On Thu, Aug 11, 2016 at 07:25:45PM +0000, Matt M wrote:
>> > I am just getting started with kernel module development, and I can't
>> get
>> > anything to compile.
>> >
>> > I get the following errors:
>> >
>> > In file included from main.c:1:0:
>> > /usr/src/linux/include/linux/init.h:142:13: error: expected ‘=’, ‘,’,
>> ‘;’,
>> > ‘asm’ or ‘__attribute__’ before ‘load_default_modules’
>> >  void __init load_default_modules(void);
>> >              ^~~~~~~~~~~~~~~~~~~~
>> > /usr/src/linux/include/linux/init.h:143:12: error: expected ‘=’, ‘,’,
>> ‘;’,
>> > ‘asm’ or ‘__attribute__’ before ‘init_rootfs’
>> >  int __init init_rootfs(void);
>> >             ^~~~~~~~~~~
>> > /usr/src/linux/include/linux/init.h:285:13: error: expected ‘=’, ‘,’,
>> ‘;’,
>> > ‘asm’ or ‘__attribute__’ before ‘parse_early_param’
>> >  void __init parse_early_param(void);
>> >              ^~~~~~~~~~~~~~~~~
>> > /usr/src/linux/include/linux/init.h:286:13: error: expected ‘=’, ‘,’,
>> ‘;’,
>> > ‘asm’ or ‘__attribute__’ before ‘parse_early_options’
>> >  void __init parse_early_options(char *cmdline);
>> >
>> >
>> > The errors go on and on, but the majority look like that.
>> >
>> > My code:
>> >
>> > #include <linux/init.h>
>> > #include <linux/module.h>
>> >
>> > int main() {
>> > return 0;
>> > }
>> >
>> >
>> > The compile command:
>> > gcc -I /usr/src/linux/include/ main.c
>>
>> That's not how you compile a Linux kernel module, sorry.
>>
>> Please read the very good documentation for how to set up a Makefile for
>> building a kernel module.  It's in the kernel's Documentation/
>> directory.
>>
>> best of luck,
>>
>> greg k-h
>>
>
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