Re: Persistent module storage [was Linux 2.4 Status / TODO page]

[David Woodhouse <dwmw2@infradead.org>]

I think we're getting confused. What I'm advocating is something like this:

init_module()
{
	struct mixer_levels *levels;

	levels = inter_module_get("mysoundcard_mixerlevels");

	if (!levels)
		/* We haven't been loaded before. Default to zero */
		levels = &default_levels;

	init_hardware(levels);
}

cleanup_module()
{
	struct mixer_levels *levels = kmalloc(sizeof *levels);

	if (levels) {
		/* Record current the levels so we can init the hardware
		   to the same next time we're loaded */
		memcpy(levels, current_levels, sizeof(*levels));
		inter_module_register("mysoundcard_mixerlevels", levels);
	}
}


(Note it's pseudocode. I _know_ it doesn't compile and that the name we 
pass to inter_module_register is removed when the module is unloaded. Oh 
and that inter_module_register will panic() and kill the whole system on 
the second unload because a registration with that name already exists.)


--
dwmw2


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