diff --git a/config/kernel-acl.m4 b/config/kernel-acl.m4
index 3ae5dc6b6..cb28fb2eb 100644
--- a/config/kernel-acl.m4
+++ b/config/kernel-acl.m4
@@ -64,49 +64,6 @@ AC_DEFUN([ZFS_AC_KERNEL_SET_CACHED_ACL_USABLE], [
 	])
 ])
 
-dnl #
-dnl # 3.1 API change,
-dnl # posix_acl_chmod() was added as the preferred interface.
-dnl #
-dnl # 3.14 API change,
-dnl # posix_acl_chmod() was changed to __posix_acl_chmod()
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_SRC_POSIX_ACL_CHMOD], [
-	ZFS_LINUX_TEST_SRC([posix_acl_chmod], [
-		#include <linux/fs.h>
-		#include <linux/posix_acl.h>
-	],[
-		posix_acl_chmod(NULL, 0, 0)
-	])
-
-	ZFS_LINUX_TEST_SRC([__posix_acl_chmod], [
-		#include <linux/fs.h>
-		#include <linux/posix_acl.h>
-	],[
-		__posix_acl_chmod(NULL, 0, 0)
-	])
-])
-
-AC_DEFUN([ZFS_AC_KERNEL_POSIX_ACL_CHMOD], [
-	AC_MSG_CHECKING([whether __posix_acl_chmod exists])
-	ZFS_LINUX_TEST_RESULT([__posix_acl_chmod], [
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE___POSIX_ACL_CHMOD, 1,
-		    [__posix_acl_chmod() exists])
-	],[
-		AC_MSG_RESULT(no)
-
-		AC_MSG_CHECKING([whether posix_acl_chmod exists])
-		ZFS_LINUX_TEST_RESULT([posix_acl_chmod], [
-			AC_MSG_RESULT(yes)
-			AC_DEFINE(HAVE_POSIX_ACL_CHMOD, 1,
-			    [posix_acl_chmod() exists])
-		],[
-			ZFS_LINUX_TEST_ERROR([posix_acl_chmod()])
-		])
-	])
-])
-
 dnl #
 dnl # 3.1 API change,
 dnl # posix_acl_equiv_mode now wants an umode_t instead of a mode_t
@@ -373,7 +330,6 @@ AC_DEFUN([ZFS_AC_KERNEL_ACL_HAS_REFCOUNT], [
 AC_DEFUN([ZFS_AC_KERNEL_SRC_ACL], [
 	ZFS_AC_KERNEL_SRC_POSIX_ACL_RELEASE
 	ZFS_AC_KERNEL_SRC_SET_CACHED_ACL_USABLE
-	ZFS_AC_KERNEL_SRC_POSIX_ACL_CHMOD
 	ZFS_AC_KERNEL_SRC_POSIX_ACL_EQUIV_MODE_WANTS_UMODE_T
 	ZFS_AC_KERNEL_SRC_POSIX_ACL_VALID_WITH_NS
 	ZFS_AC_KERNEL_SRC_INODE_OPERATIONS_GET_ACL
@@ -385,7 +341,6 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_ACL], [
 AC_DEFUN([ZFS_AC_KERNEL_ACL], [
 	ZFS_AC_KERNEL_POSIX_ACL_RELEASE
 	ZFS_AC_KERNEL_SET_CACHED_ACL_USABLE
-	ZFS_AC_KERNEL_POSIX_ACL_CHMOD
 	ZFS_AC_KERNEL_POSIX_ACL_EQUIV_MODE_WANTS_UMODE_T
 	ZFS_AC_KERNEL_POSIX_ACL_VALID_WITH_NS
 	ZFS_AC_KERNEL_INODE_OPERATIONS_GET_ACL
diff --git a/include/os/linux/kernel/linux/vfs_compat.h b/include/os/linux/kernel/linux/vfs_compat.h
index 5e7874c5b..9f7bce424 100644
--- a/include/os/linux/kernel/linux/vfs_compat.h
+++ b/include/os/linux/kernel/linux/vfs_compat.h
@@ -231,22 +231,6 @@ zpl_forget_cached_acl(struct inode *ip, int type)
 }
 #endif /* HAVE_SET_CACHED_ACL_USABLE */
 
-/*
- * 3.1 API change,
- * posix_acl_chmod() was added as the preferred interface.
- *
- * 3.14 API change,
- * posix_acl_chmod() was changed to __posix_acl_chmod()
- */
-#ifndef HAVE___POSIX_ACL_CHMOD
-#ifdef HAVE_POSIX_ACL_CHMOD
-#define	__posix_acl_chmod(acl, gfp, mode)	posix_acl_chmod(acl, gfp, mode)
-#define	__posix_acl_create(acl, gfp, mode)	posix_acl_create(acl, gfp, mode)
-#else
-#error "Unsupported kernel"
-#endif /* HAVE_POSIX_ACL_CHMOD */
-#endif /* HAVE___POSIX_ACL_CHMOD */
-
 /*
  * 4.8 API change,
  * posix_acl_valid() now must be passed a namespace, the namespace from