Re: Patch/resubmit linux-2.5.63-bk4 try_module_get simplification

[Roman Zippel <zippel@linux-m68k.org>]

Hi,

On Sun, 2 Mar 2003, Adam J. Richter wrote:

> 	Is there enough traffic on the module reference counts to make
> this trade-off worthwhile?

I don't know, you have to ask that Rusty.
BTW the same trick is also possible with the old module count:

int try_inc_mod_count(struct module *mod)
{
	int res;

	if (mod) {
		__MOD_INC_USE_COUNT(mod);
		smp_mb__after_atomic_inc()
		if (unlikely(mod->flags & MOD_DELETED))
			goto check;
	}
	return 1;
check:
	res = 1;
	spin_lock(&unload_lock);
	if (mod->flags & MOD_DELETED) {
		__MOD_DEC_USE_COUNT(mod);
		res = 0;
	}
	spin_unlock(&unload_lock);
	return res;
}

(and a similiar change to sys_delete_module.)

bye, Roman