diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index b1cd04087d6..418d6361968 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -16,9 +16,9 @@ struct queue_sysfs_entry {
 };
 
 static ssize_t
-queue_var_show(unsigned int var, char *page)
+queue_var_show(unsigned long var, char *page)
 {
-	return sprintf(page, "%d\n", var);
+	return sprintf(page, "%lu\n", var);
 }
 
 static ssize_t
@@ -77,7 +77,8 @@ queue_requests_store(struct request_queue *q, const char *page, size_t count)
 
 static ssize_t queue_ra_show(struct request_queue *q, char *page)
 {
-	int ra_kb = q->backing_dev_info.ra_pages << (PAGE_CACHE_SHIFT - 10);
+	unsigned long ra_kb = q->backing_dev_info.ra_pages <<
+					(PAGE_CACHE_SHIFT - 10);
 
 	return queue_var_show(ra_kb, (page));
 }
@@ -189,9 +190,9 @@ static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
 
 static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
 {
-	unsigned int set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
+	bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
 
-	return queue_var_show(set != 0, page);
+	return queue_var_show(set, page);
 }
 
 static ssize_t
diff --git a/block/elevator.c b/block/elevator.c
index 6f2375339a9..2d511f9105e 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -101,11 +101,16 @@ int elv_rq_merge_ok(struct request *rq, struct bio *bio)
 		return 0;
 
 	/*
-	 * Don't merge if failfast settings don't match
+	 * Don't merge if failfast settings don't match.
+	 *
+	 * FIXME: The negation in front of each condition is necessary
+	 * because bio and request flags use different bit positions
+	 * and the accessors return those bits directly.  This
+	 * ugliness will soon go away.
 	 */
-	if (bio_failfast_dev(bio)	!= blk_failfast_dev(rq)		||
-	    bio_failfast_transport(bio)	!= blk_failfast_transport(rq)	||
-	    bio_failfast_driver(bio)	!= blk_failfast_driver(rq))
+	if (!bio_failfast_dev(bio)	 != !blk_failfast_dev(rq)	||
+	    !bio_failfast_transport(bio) != !blk_failfast_transport(rq)	||
+	    !bio_failfast_driver(bio)	 != !blk_failfast_driver(rq))
 		return 0;
 
 	if (!elv_iosched_allow_merge(rq, bio))
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index f5e7180d7f4..3ff02941b3d 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -1627,7 +1627,7 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode,
 				drive, dtp->blocks, dtp->spt, dtp->stretch);
 
 		/* sanity check */
-		if (!dtp || setprm.track != dtp->blocks/dtp->spt/2 ||
+		if (setprm.track != dtp->blocks/dtp->spt/2 ||
 		    setprm.head != 2) {
 			redo_fd_request();
 			return -EINVAL;
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index fbeefb68a31..aa1a3d5a3e2 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -427,7 +427,12 @@ static unsigned int features[] = {
 	VIRTIO_BLK_F_SCSI, VIRTIO_BLK_F_IDENTIFY
 };
 
-static struct virtio_driver virtio_blk = {
+/*
+ * virtio_blk causes spurious section mismatch warning by
+ * simultaneously referring to a __devinit and a __devexit function.
+ * Use __refdata to avoid this warning.
+ */
+static struct virtio_driver __refdata virtio_blk = {
 	.feature_table = features,
 	.feature_table_size = ARRAY_SIZE(features),
 	.driver.name =	KBUILD_MODNAME,
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index 4575171e5be..b2590409f25 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -374,7 +374,7 @@ err:
 static void __exit z2_exit(void)
 {
     int i, j;
-    blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), 256);
+    blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT);
     unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
     del_gendisk(z2ram_gendisk);
     put_disk(z2ram_gendisk);