diff --git a/drivers/md/md.c b/drivers/md/md.c
index db1ac84a739a..40cb79ac4039 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3409,6 +3409,7 @@ static void autorun_devices(int part)
 
 	printk(KERN_INFO "md: autorun ...\n");
 	while (!list_empty(&pending_raid_disks)) {
+		int unit;
 		dev_t dev;
 		LIST_HEAD(candidates);
 		rdev0 = list_entry(pending_raid_disks.next,
@@ -3428,16 +3429,19 @@ static void autorun_devices(int part)
 		 * mostly sane superblocks. It's time to allocate the
 		 * mddev.
 		 */
-		if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
+		if (part) {
+			dev = MKDEV(mdp_major,
+				    rdev0->preferred_minor << MdpMinorShift);
+			unit = MINOR(dev) >> MdpMinorShift;
+		} else {
+			dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
+			unit = MINOR(dev);
+		}
+		if (rdev0->preferred_minor != unit) {
 			printk(KERN_INFO "md: unit number in %s is bad: %d\n",
 			       bdevname(rdev0->bdev, b), rdev0->preferred_minor);
 			break;
 		}
-		if (part)
-			dev = MKDEV(mdp_major,
-				    rdev0->preferred_minor << MdpMinorShift);
-		else
-			dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
 
 		md_probe(dev, NULL, NULL);
 		mddev = mddev_find(dev);
@@ -5524,22 +5528,15 @@ static void md_geninit(void)
 
 static int __init md_init(void)
 {
-	printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
-			" MD_SB_DISKS=%d\n",
-			MD_MAJOR_VERSION, MD_MINOR_VERSION,
-			MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
-	printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
-			BITMAP_MINOR);
-
 	if (register_blkdev(MAJOR_NR, "md"))
 		return -1;
 	if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
 		unregister_blkdev(MAJOR_NR, "md");
 		return -1;
 	}
-	blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
-				md_probe, NULL, NULL);
-	blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
+	blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
+			    md_probe, NULL, NULL);
+	blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
 			    md_probe, NULL, NULL);
 
 	register_reboot_notifier(&md_notifier);
@@ -5598,8 +5595,8 @@ static __exit void md_exit(void)
 	mddev_t *mddev;
 	struct list_head *tmp;
 
-	blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
-	blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
+	blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
+	blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
 
 	unregister_blkdev(MAJOR_NR,"md");
 	unregister_blkdev(mdp_major, "mdp");
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index e423dad1a7fd..8245c282168b 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -31,18 +31,15 @@
 #define	LEVEL_NONE		(-1000000)
 
 #define MaxSector (~(sector_t)0)
-#define MD_THREAD_NAME_MAX 14
 
 typedef struct mddev_s mddev_t;
 typedef struct mdk_rdev_s mdk_rdev_t;
 
-#define MAX_MD_DEVS  256	/* Max number of md dev */
-
 /*
  * options passed in raidrun:
  */
 
-/* Currently this must fix in an 'int' */
+/* Currently this must fit in an 'int' */
 #define MAX_CHUNK_SIZE (1<<30)
 
 /*
diff --git a/init/do_mounts_md.c b/init/do_mounts_md.c
index 2429e1bf8c60..753dc54a6649 100644
--- a/init/do_mounts_md.c
+++ b/init/do_mounts_md.c
@@ -20,7 +20,7 @@ static struct {
 	int level;
 	int chunk;
 	char *device_names;
-} md_setup_args[MAX_MD_DEVS] __initdata;
+} md_setup_args[256] __initdata;
 
 static int md_setup_ents __initdata;
 
@@ -61,10 +61,6 @@ static int __init md_setup(char *str)
 		return 0;
 	}
 	str1 = str;
-	if (minor >= MAX_MD_DEVS) {
-		printk(KERN_WARNING "md: md=%d, Minor device number too high.\n", minor);
-		return 0;
-	}
 	for (ent=0 ; ent< md_setup_ents ; ent++)
 		if (md_setup_args[ent].minor == minor &&
 		    md_setup_args[ent].partitioned == partitioned) {
@@ -72,7 +68,7 @@ static int __init md_setup(char *str)
 			       "Replacing previous definition.\n", partitioned?"d":"", minor);
 			break;
 		}
-	if (ent >= MAX_MD_DEVS) {
+	if (ent >= ARRAY_SIZE(md_setup_args)) {
 		printk(KERN_WARNING "md: md=%s%d - too many md initialisations\n", partitioned?"d":"", minor);
 		return 0;
 	}