umh_disable_depth
extern int __usermodehelper_disable(enum umh_disable_depth depth);
extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth);
static enum umh_disable_depth usermodehelper_disabled = UMH_DISABLED;
void __usermodehelper_set_disable_depth(enum umh_disable_depth depth)
int __usermodehelper_disable(enum umh_disable_depth depth)