diff --git a/config/kernel-blk-queue-io-opt.m4 b/config/kernel-blk-queue-io-opt.m4
deleted file mode 100644
index fb9b6841b5..0000000000
--- a/config/kernel-blk-queue-io-opt.m4
+++ /dev/null
@@ -1,24 +0,0 @@
-dnl #
-dnl # 2.6.30 API change
-dnl # The blk_queue_io_opt() function was added to indicate the optimal
-dnl # I/O size for the device.
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT], [
-	AC_MSG_CHECKING([whether blk_queue_io_opt() is available])
-	tmp_flags="$EXTRA_KCFLAGS"
-	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
-	ZFS_LINUX_TRY_COMPILE([
-		#include <linux/blkdev.h>
-	],[
-		struct request_queue *q = NULL;
-		unsigned int opt = 1;
-		(void) blk_queue_io_opt(q, opt);
-	],[
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_BLK_QUEUE_IO_OPT, 1,
-		          [blk_queue_io_opt() is available])
-	],[
-		AC_MSG_RESULT(no)
-	])
-	EXTRA_KCFLAGS="$tmp_flags"
-])
diff --git a/config/kernel.m4 b/config/kernel.m4
index d24e0b6df4..09d8003f12 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -29,7 +29,6 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
 	ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS
 	ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS
-	ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT
 	ZFS_AC_KERNEL_BLK_QUEUE_NONROT
 	ZFS_AC_KERNEL_BLK_QUEUE_DISCARD
 	ZFS_AC_KERNEL_BLK_FETCH_REQUEST
diff --git a/include/linux/blkdev_compat.h b/include/linux/blkdev_compat.h
index 591602bc95..ef6fa3bbd6 100644
--- a/include/linux/blkdev_compat.h
+++ b/include/linux/blkdev_compat.h
@@ -228,15 +228,6 @@ __blk_queue_max_segments(struct request_queue *q, unsigned short max_segments)
 }
 #endif
 
-/*
- * 2.6.30 API change,
- * The blk_queue_io_opt() function was added to indicate the optimal
- * I/O size for the device.  For older kernels this is a no-op.
- */
-#ifndef HAVE_BLK_QUEUE_IO_OPT
-#define	blk_queue_io_opt(q, x)			((void)(0))
-#endif
-
 #ifndef HAVE_GET_DISK_RO
 static inline int
 get_disk_ro(struct gendisk *disk)