diff --git a/config/kernel-rq-is_sync.m4 b/config/kernel-rq-is_sync.m4
deleted file mode 100644
index f6f51c87a..000000000
--- a/config/kernel-rq-is_sync.m4
+++ /dev/null
@@ -1,21 +0,0 @@
-dnl #
-dnl # 2.6.x API change
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_RQ_IS_SYNC], [
-	AC_MSG_CHECKING([whether rq_is_sync() is available])
-	tmp_flags="$EXTRA_KCFLAGS"
-	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
-	ZFS_LINUX_TRY_COMPILE([
-		#include <linux/blkdev.h>
-	],[
-		struct request *req = NULL;
-		(void) rq_is_sync(req);
-	],[
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_RQ_IS_SYNC, 1,
-		          [rq_is_sync() is available])
-	],[
-		AC_MSG_RESULT(no)
-	])
-	EXTRA_KCFLAGS="$tmp_flags"
-])
diff --git a/config/kernel.m4 b/config/kernel.m4
index 245406297..b06cdfa59 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -41,7 +41,6 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_BLK_RQ_SECTORS
 	ZFS_AC_KERNEL_GET_DISK_RO
 	ZFS_AC_KERNEL_GET_GENDISK
-	ZFS_AC_KERNEL_RQ_IS_SYNC
 	ZFS_AC_KERNEL_DISCARD_GRANULARITY
 	ZFS_AC_KERNEL_CONST_XATTR_HANDLER
 	ZFS_AC_KERNEL_XATTR_HANDLER_GET
diff --git a/include/linux/blkdev_compat.h b/include/linux/blkdev_compat.h
index b2b641840..2dbf87ca6 100644
--- a/include/linux/blkdev_compat.h
+++ b/include/linux/blkdev_compat.h
@@ -241,14 +241,6 @@ get_disk_ro(struct gendisk *disk)
 }
 #endif /* HAVE_GET_DISK_RO */
 
-#ifndef HAVE_RQ_IS_SYNC
-static inline bool
-rq_is_sync(struct request *req)
-{
-	return (req->flags & REQ_RW_SYNC);
-}
-#endif /* HAVE_RQ_IS_SYNC */
-
 #ifdef HAVE_BIO_BVEC_ITER
 #define	BIO_BI_SECTOR(bio)	(bio)->bi_iter.bi_sector
 #define	BIO_BI_SIZE(bio)	(bio)->bi_iter.bi_size