#1.

zfs/module/zfs/../../module/zfs/vdev_disk.c:126:2: error: implicit declaration of function 'open_bdev_excl'
zfs/module/zfs/../../module/zfs/vdev_disk.c:161:3: error: implicit declaration of function 'close_bdev_excl'

The following trivial patch fixes it:

--- a/include/sys/vdev_disk.h.orig      2011-02-21 00:28:13.913279487 -0800
+++ a/include/sys/vdev_disk.h   2011-02-21 00:29:57.883276290 -0800
@@ -63,8 +63,8 @@
 # define vdev_bdev_open(path, md, hld) open_bdev_exclusive(path, md, hld)
 # define vdev_bdev_close(bdev, md)     close_bdev_exclusive(bdev, md)
 #else
-# define vdev_bdev_open(path, md, hld) open_bdev_excl(path, md, hld)
-# define vdev_bdev_close(bdev, md)     close_bdev_excl(bdev)
+# define vdev_bdev_open(path, md, hld) blkdev_get_by_path(path, (md)|FMODE_EXCL, hld)
+# define vdev_bdev_close(bdev, md)     blkdev_put(bdev, (md)|FMODE_EXCL)
 #endif /* HAVE_OPEN_BDEV_EXCLUSIVE */
 
 /* 2.6.22 API change */

#2.

zfs/module/zfs/../../module/zfs/zvol.c:247:2: error: too few arguments to function 'blkdev_get'

Its because SPL never tests for blkdev_get:

../spl/spl_config.h:/* #undef HAVE_3ARGS_BLKDEV_GET */

Don't know how to handle the following:
#3.

lzfs/module/lzfs_vnops.c:1275:2: error: initialization from incompatible pointer type
lzfs/module/lzfs_vnops.c:1309:2: error: initialization from incompatible pointer type
#4.

module/lzfs_snap.c:199:2: error: implicit declaration of function 'do_add_mount'
lzfs/module/lzfs_snap.c:220:4: error: too few arguments to function 'follow_down'