diff options
Diffstat (limited to 'mm/mmzone.c')
| -rw-r--r-- | mm/mmzone.c | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/mm/mmzone.c b/mm/mmzone.c index 16ce8b955dc..bf34fb8556d 100644 --- a/mm/mmzone.c +++ b/mm/mmzone.c @@ -1,13 +1,13 @@ /* * linux/mm/mmzone.c * - * management codes for pgdats and zones. + * management codes for pgdats, zones and page flags */ #include <linux/stddef.h> +#include <linux/mm.h> #include <linux/mmzone.h> -#include <linux/module.h> struct pglist_data *first_online_pgdat(void) { @@ -72,3 +72,45 @@ struct zoneref *next_zones_zonelist(struct zoneref *z, *zone = zonelist_zone(z); return z; } + +#ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL +int memmap_valid_within(unsigned long pfn, + struct page *page, struct zone *zone) +{ + if (page_to_pfn(page) != pfn) + return 0; + + if (page_zone(page) != zone) + return 0; + + return 1; +} +#endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */ + +void lruvec_init(struct lruvec *lruvec) +{ + enum lru_list lru; + + memset(lruvec, 0, sizeof(struct lruvec)); + + for_each_lru(lru) + INIT_LIST_HEAD(&lruvec->lists[lru]); +} + +#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS) +int page_cpupid_xchg_last(struct page *page, int cpupid) +{ + unsigned long old_flags, flags; + int last_cpupid; + + do { + old_flags = flags = page->flags; + last_cpupid = page_cpupid_last(page); + + flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT); + flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT; + } while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags)); + + return last_cpupid; +} +#endif |