if (!populated_zone(zone)) continue;
static inline int populated_zone(struct zone *zone) { return (!!zone->present_pages); }!!zone->present_pages这句,为什么要这样写?有什么玄机吗?
if (!populated_zone(zone)) continue;
static inline int populated_zone(struct zone *zone) { return (!!zone->present_pages); }!!zone->present_pages这句,为什么要这样写?有什么玄机吗?