Kernel module compilation errors

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

Thanks in advance for any help
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