SWP_USED
if (!(si->flags & SWP_USED) || !si->swap_map)
if (!(si->flags & SWP_USED) || !si->swap_map)
if (!(swap_info[type]->flags & SWP_USED))
p->flags = SWP_USED;
if ((si->flags & SWP_USED) && !(si->flags & SWP_WRITEOK))