Linux Kernel Module Cheat

17.3.2. Kernel command line parameters definition points

There are two methods:

__setup as in:
```
__setup("console=", console_setup);
```

core_param as in:

core_param(panic, panic_timeout, int, 0644);

core_param suggests how they are different:

/**
 * core_param - define a historical core kernel parameter.

...

 * core_param is just like module_param(), but cannot be modular and
 * doesn't add a prefix (such as "printk.").  This is for compatibility
 * with __setup(), and it makes sense as truly core parameters aren't
 * tied to the particular file they're in.
 */