diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 1ae97a0b8ec7..b626d1bacef5 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -69,6 +69,15 @@ static inline void totalram_pages_add(long count) extern void * high_memory; +/* + * Convert between pages and MB + * 20 is the shift for 1MB (2^20 = 1MB) + * PAGE_SHIFT is the shift for page size (e.g., 12 for 4KB pages) + * So (20 - PAGE_SHIFT) converts between pages and MB + */ +#define PAGES_TO_MB(pages) ((pages) >> (20 - PAGE_SHIFT)) +#define MB_TO_PAGES(mb) ((mb) << (20 - PAGE_SHIFT)) + #ifdef CONFIG_SYSCTL extern int sysctl_legacy_va_layout; #else |