--- block/genhd.c

+++ block/genhd.c

@@ -624,26 +624,6 @@ void add_disk(struct gendisk *disk)

"bdi");

WARN_ON(retval);

- /*

- * Limit default readahead size for small devices.

- * disk size readahead size

- * 1M 8k

- * 4M 16k

- * 16M 32k

- * 64M 64k

- * 256M 128k

- * 1G 256k

- * 4G 512k

- * 16G 1024k

- * 64G 2048k

- * 256G 4096k

- */

- if (get_capacity(disk)) {

- unsigned long size = get_capacity(disk) >> 9;

- size = 1UL << (ilog2(size) / 2);

- bdi->ra_pages = min(bdi->ra_pages, size);

- }

-

disk_add_events(disk);

}

EXPORT_SYMBOL(add_disk);