diff options
Diffstat (limited to 'include/linux/mmzone.h')
| -rw-r--r-- | include/linux/mmzone.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 28066b4ced81..283913d42d7b 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -37,6 +37,22 @@ #define NR_PAGE_ORDERS (MAX_PAGE_ORDER + 1) +/* Defines the order for the number of pages that have a migrate type. */ +#ifndef CONFIG_PAGE_BLOCK_ORDER +#define PAGE_BLOCK_ORDER MAX_PAGE_ORDER +#else +#define PAGE_BLOCK_ORDER CONFIG_PAGE_BLOCK_ORDER +#endif /* CONFIG_PAGE_BLOCK_ORDER */ + +/* + * The MAX_PAGE_ORDER, which defines the max order of pages to be allocated + * by the buddy allocator, has to be larger or equal to the PAGE_BLOCK_ORDER, + * which defines the order for the number of pages that can have a migrate type + */ +#if (PAGE_BLOCK_ORDER > MAX_PAGE_ORDER) +#error MAX_PAGE_ORDER must be >= PAGE_BLOCK_ORDER +#endif + /* * PAGE_ALLOC_COSTLY_ORDER is the order at which allocations are deemed * costly to service. That is between allocation orders which should |