__usermodehelper_set_disable_depth
extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth);
__usermodehelper_set_disable_depth(UMH_ENABLED);
__usermodehelper_set_disable_depth(UMH_DISABLED);
__usermodehelper_set_disable_depth(UMH_FREEZING);
__usermodehelper_set_disable_depth(UMH_ENABLED);