From: Wei Yang <richard.weiyang@xxxxxxxxxxxxxxxxx> Subject: mm/page_alloc: fallbacks at most has 3 elements MIGRAGE_TYPES is used to be the mark of end and there are at most 3 elements for the one dimension array. Reduce to 3 to save little memory. Link: http://lkml.kernel.org/r/20200625231022.18784-1-richard.weiyang@xxxxxxxxxxxxxxxxx Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxxxxxxxxxx> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/page_alloc.c~mm-page_alloc-fallbacks-at-most-has-3-elements +++ a/mm/page_alloc.c @@ -2268,7 +2268,7 @@ struct page *__rmqueue_smallest(struct z * This array describes the order lists are fallen back to when * the free lists for the desirable migrate type are depleted */ -static int fallbacks[MIGRATE_TYPES][4] = { +static int fallbacks[MIGRATE_TYPES][3] = { [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_TYPES }, [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, _
