> MOD_INC_USE_COUNT and MOD_DEC_USE_COUNT are incorrect on SMP. That is,
> if they are called from the module, there is a race condition.
>
Hmmm...but this code from linux/include/linux/module.h says atomic_inc.
#define __MOD_INC_USE_COUNT(mod) \
(atomic_inc(&(mod)->uc.usecount), (mod)->flags |=
MOD_VISITED|MOD_USED_ONCE)
> Anyway, such module may be unloaded using kgdb, or maybe even gdb on
> /proc/kcore - you zero out the counter manually. Or you can write
> a simple module, that will zero the count (it will only have the init
> function, which will return error at the end, so nothing will be actualy
> loaded).
Well ive an idea, plz tellme if this is feasible.
We traverse the list of modules by doing:
struct module *mod_list = THIS_MODULE;
and identify the module which has faulted.
Then manually doin some cleanups.
in linux/kernel/module.c i saw this code:
sys_delete_module(const char *name_user);
{
:
:
if (!__MOD_IN_USE(mod)) {
mod->flags |= MOD_DELETED;
spin_unlock(&unload_lock);
free_module(mod, 0);
error = 0;
} else {
/* We can do cleanup here */
spin_unlock(&unload_lock);
}
goto out;
:
:
}
Well, but i think this would also introduce bugs.
Anybody who knows what r those ??
-nagaraj
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