--- block/blk-core.c

+++ block/blk-core.c

@@ -413,7 +413,8 @@ struct request_queue *blk_alloc_queue_no

if (!q)

return NULL;

- q->backing_dev_info.ra_pages = max_readahead_pages;

+ q->backing_dev_info.ra_pages =

+ (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;

q->backing_dev_info.state = 0;

q->backing_dev_info.capabilities = BDI_CAP_MAP_COPY;

q->backing_dev_info.name = "block";