[PATCH] md: Remove dependance on MD_SB_DISKS in linear personality

Linear uses one array sized by MD_SB_DISKS inside a structure.
We move it to the end of the structure, declare it as size 0,
and arrange for approprate extra space to be allocated on
structure allocation.

drivers/md/linear.c

@@ -89,7 +89,8 @@ static int linear_run (mddev_t *mddev)
 	unsigned int curr_offset;
 	struct list_head *tmp;
 
-	conf = kmalloc (sizeof (*conf), GFP_KERNEL);
+	conf = kmalloc (sizeof (*conf) + mddev->raid_disks*sizeof(dev_info_t),
+			GFP_KERNEL);
 	if (!conf)
 		goto out;
 	memset(conf, 0, sizeof(*conf));

include/linux/raid/linear.h

@@ -19,9 +19,9 @@ struct linear_hash
 struct linear_private_data
 {
 	struct linear_hash	*hash_table;
-	dev_info_t		disks[MD_SB_DISKS];
 	dev_info_t		*smallest;
 	int			nr_zones;
+	dev_info_t		disks[0];
 };