diff --git a/config/kernel-filemap.m4 b/config/kernel-filemap.m4
deleted file mode 100644
index 0b7da828d..000000000
--- a/config/kernel-filemap.m4
+++ /dev/null
@@ -1,27 +0,0 @@
-dnl #
-dnl # filemap_range_has_page was not available till 4.13
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_SRC_FILEMAP], [
-	ZFS_LINUX_TEST_SRC([filemap_range_has_page], [
-		#include <linux/fs.h>
-		#include <linux/pagemap.h>
-	],[
-		struct address_space *mapping = NULL;
-		loff_t lstart = 0;
-		loff_t lend = 0;
-		bool ret __attribute__ ((unused));
-
-		ret = filemap_range_has_page(mapping, lstart, lend);
-	])
-])
-
-AC_DEFUN([ZFS_AC_KERNEL_FILEMAP], [
-	AC_MSG_CHECKING([whether filemap_range_has_page() is available])
-	ZFS_LINUX_TEST_RESULT([filemap_range_has_page], [
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_FILEMAP_RANGE_HAS_PAGE, 1,
-		[filemap_range_has_page() is available])
-	],[
-		AC_MSG_RESULT(no)
-	])
-])
diff --git a/config/kernel.m4 b/config/kernel.m4
index ef8eb8d43..80481141a 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -69,7 +69,6 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_INODE_GETATTR
 	ZFS_AC_KERNEL_SRC_INODE_SET_IVERSION
 	ZFS_AC_KERNEL_SRC_SHOW_OPTIONS
-	ZFS_AC_KERNEL_SRC_FILEMAP
 	ZFS_AC_KERNEL_SRC_SHRINKER
 	ZFS_AC_KERNEL_SRC_MKDIR
 	ZFS_AC_KERNEL_SRC_LOOKUP_FLAGS
@@ -132,7 +131,6 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_IDMAP_MNT_API
 	ZFS_AC_KERNEL_SRC_IDMAP_NO_USERNS
 	ZFS_AC_KERNEL_SRC_IATTR_VFSID
-	ZFS_AC_KERNEL_SRC_FILEMAP
 	ZFS_AC_KERNEL_SRC_WRITEPAGE_T
 	ZFS_AC_KERNEL_SRC_RECLAIMED
 	ZFS_AC_KERNEL_SRC_REGISTER_SYSCTL_TABLE
@@ -193,7 +191,6 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_INODE_GETATTR
 	ZFS_AC_KERNEL_INODE_SET_IVERSION
 	ZFS_AC_KERNEL_SHOW_OPTIONS
-	ZFS_AC_KERNEL_FILEMAP
 	ZFS_AC_KERNEL_SHRINKER
 	ZFS_AC_KERNEL_MKDIR
 	ZFS_AC_KERNEL_LOOKUP_FLAGS
@@ -256,7 +253,6 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_IDMAP_MNT_API
 	ZFS_AC_KERNEL_IDMAP_NO_USERNS
 	ZFS_AC_KERNEL_IATTR_VFSID
-	ZFS_AC_KERNEL_FILEMAP
 	ZFS_AC_KERNEL_WRITEPAGE_T
 	ZFS_AC_KERNEL_RECLAIMED
 	ZFS_AC_KERNEL_REGISTER_SYSCTL_TABLE
diff --git a/include/os/linux/zfs/sys/zfs_znode_impl.h b/include/os/linux/zfs/sys/zfs_znode_impl.h
index e02886518..cbc852301 100644
--- a/include/os/linux/zfs/sys/zfs_znode_impl.h
+++ b/include/os/linux/zfs/sys/zfs_znode_impl.h
@@ -47,16 +47,9 @@
 extern "C" {
 #endif
 
-#if defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
 #define	ZNODE_OS_FIELDS			\
 	inode_timespec_t z_btime; /* creation/birth time (cached) */ \
 	struct inode	z_inode;
-#else
-#define	ZNODE_OS_FIELDS			\
-	inode_timespec_t z_btime; /* creation/birth time (cached) */ \
-	struct inode	z_inode;                                     \
-	boolean_t	z_is_mapped;    /* we are mmap'ed */
-#endif
 
 /*
  * Convert between znode pointers and inode pointers
@@ -77,13 +70,8 @@ extern "C" {
 #define	Z_ISDEV(type)	(S_ISCHR(type) || S_ISBLK(type) || S_ISFIFO(type))
 #define	Z_ISDIR(type)	S_ISDIR(type)
 
-#if defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
 #define	zn_has_cached_data(zp, start, end) \
 	filemap_range_has_page(ZTOI(zp)->i_mapping, start, end)
-#else
-#define	zn_has_cached_data(zp, start, end) \
-	((zp)->z_is_mapped)
-#endif
 
 #define	zn_flush_cached_data(zp, sync)	write_inode_now(ZTOI(zp), sync)
 #define	zn_rlimit_fsize(size)		(0)
diff --git a/module/os/linux/zfs/zfs_ctldir.c b/module/os/linux/zfs/zfs_ctldir.c
index e04211633..a8b25b2bd 100644
--- a/module/os/linux/zfs/zfs_ctldir.c
+++ b/module/os/linux/zfs/zfs_ctldir.c
@@ -500,9 +500,6 @@ zfsctl_inode_alloc(zfsvfs_t *zfsvfs, uint64_t id,
 	zp->z_atime_dirty = B_FALSE;
 	zp->z_zn_prefetch = B_FALSE;
 	zp->z_is_sa = B_FALSE;
-#if !defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
-	zp->z_is_mapped = B_FALSE;
-#endif
 	zp->z_is_ctldir = B_TRUE;
 	zp->z_sa_hdl = NULL;
 	zp->z_blksz = 0;
diff --git a/module/os/linux/zfs/zfs_znode.c b/module/os/linux/zfs/zfs_znode.c
index 7f031d16f..8b0011c37 100644
--- a/module/os/linux/zfs/zfs_znode.c
+++ b/module/os/linux/zfs/zfs_znode.c
@@ -535,9 +535,6 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
 	ASSERT3P(zp->z_xattr_cached, ==, NULL);
 	zp->z_unlinked = B_FALSE;
 	zp->z_atime_dirty = B_FALSE;
-#if !defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
-	zp->z_is_mapped = B_FALSE;
-#endif
 	zp->z_is_ctldir = B_FALSE;
 	zp->z_suspended = B_FALSE;
 	zp->z_sa_hdl = NULL;
diff --git a/module/os/linux/zfs/zpl_file.c b/module/os/linux/zfs/zpl_file.c
index 25aa43416..4d1bf1d54 100644
--- a/module/os/linux/zfs/zpl_file.c
+++ b/module/os/linux/zfs/zpl_file.c
@@ -432,13 +432,6 @@ zpl_mmap(struct file *filp, struct vm_area_struct *vma)
 	if (error)
 		return (error);
 
-#if !defined(HAVE_FILEMAP_RANGE_HAS_PAGE)
-	znode_t *zp = ITOZ(ip);
-	mutex_enter(&zp->z_lock);
-	zp->z_is_mapped = B_TRUE;
-	mutex_exit(&zp->z_lock);
-#endif
-
 	return (error);
 }