On 2020-08-29 06:29, Warner Losh wrote: > +#define DEVCTL_BUFFER (1024 - sizeof(void *)) > struct dev_event_info { > - char *dei_data; > STAILQ_ENTRY(dev_event_info) dei_link; > + char dei_data[DEVCTL_BUFFER]; > }; Maybe add: CTASSERT(sizeof(struct dev_event_info) == 1024); Not sure if STAILQ's can have some debug fields in them. --HPS