On Tuesday 30 March 2004 08:22 am, Amith wrote:
> hi ,
> but the question still remains - how does THIS_MODULE convert
> itself into the struct module * of the module where
> it is declared ? .
>
> #define THIS_MODULE (&__this_module). /* from
> <linux/module.h> */
>
>
>
> int init_module (void)
> {
> struct module *mine = THIS_MODULE ;
> ......
> }
>
> could someone explain ?
>
If you look further down in include/linux/module.h you will see the
definition of __this_module:
#ifdef MODULE
extern struct module __this_module;
#ifdef KBUILD_MODNAME
/* We make the linker do some of the work. */
struct module __this_module
__attribute__((section(".gnu.linkonce.this_module"))) = {
.name = __stringify(KBUILD_MODNAME),
.init = init_module,
#ifdef CONFIG_MODULE_UNLOAD
.exit = cleanup_module,
#endif
};
#endif /* KBUILD_MODNAME */
#endif /* MODULE */
KBUILD_MODNAME is set to the name of the resulting module (like psmouse)
and "linkonce" stuff takes care of multiple copies.
--
Dmitry
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