diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mmzone.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index d80490b1265c..be4f03235e3d 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -279,6 +279,38 @@ extern struct pglist_data contig_page_data; #endif /* !CONFIG_DISCONTIGMEM */ + +extern DECLARE_BITMAP(memblk_online_map, MAX_NR_MEMBLKS); + +#if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_NUMA) + +#define memblk_online(memblk) test_bit(memblk, memblk_online_map) +#define memblk_set_online(memblk) set_bit(memblk, memblk_online_map) +#define memblk_set_offline(memblk) clear_bit(memblk, memblk_online_map) +static inline unsigned int num_online_memblks(void) +{ + int i, num = 0; + + for(i = 0; i < MAX_NR_MEMBLKS; i++){ + if (memblk_online(i)) + num++; + } + return num; +} + +#else /* !CONFIG_DISCONTIGMEM && !CONFIG_NUMA */ + +#define memblk_online(memblk) \ + ({ BUG_ON((memblk) != 0); test_bit(memblk, memblk_online_map); }) +#define memblk_set_online(memblk) \ + ({ BUG_ON((memblk) != 0); set_bit(memblk, memblk_online_map); }) +#define memblk_set_offline(memblk) \ + ({ BUG_ON((memblk) != 0); clear_bit(memblk, memblk_online_map); }) +#define num_online_memblks() 1 + +#endif /* CONFIG_DISCONTIGMEM || CONFIG_NUMA */ + + #define MAP_ALIGN(x) ((((x) % sizeof(struct page)) == 0) ? (x) : ((x) + \ sizeof(struct page) - ((x) % sizeof(struct page)))) |