Index: head/lib/libc/sys/mmap.2
===================================================================
--- head/lib/libc/sys/mmap.2
+++ head/lib/libc/sys/mmap.2
@@ -28,7 +28,7 @@
 .\"	@(#)mmap.2	8.4 (Berkeley) 5/11/95
 .\" $FreeBSD$
 .\"
-.Dd June 20, 2019
+.Dd February 26, 2020
 .Dt MMAP 2
 .Os
 .Sh NAME
@@ -432,11 +432,6 @@
 .Fa prot
 argument.
 .It Bq Er EINVAL
-The
-.Fa prot
-argument contains permissions which are not a subset of the specified
-maximum permissions.
-.It Bq Er EINVAL
 An undefined option was set in the
 .Fa flags
 argument.
@@ -530,6 +525,11 @@
 argument was not available.
 .Dv MAP_ANON
 was specified and insufficient memory was available.
+.It Bq Er ENOTSUP
+The
+.Fa prot
+argument contains permissions which are not a subset of the specified
+maximum permissions.
 .El
 .Sh SEE ALSO
 .Xr madvise 2 ,
Index: head/lib/libc/sys/mprotect.2
===================================================================
--- head/lib/libc/sys/mprotect.2
+++ head/lib/libc/sys/mprotect.2
@@ -28,7 +28,7 @@
 .\"	@(#)mprotect.2	8.1 (Berkeley) 6/9/93
 .\" $FreeBSD$
 .\"
-.Dd June 20, 2019
+.Dd February 26, 2020
 .Dt MPROTECT 2
 .Os
 .Sh NAME
@@ -104,7 +104,7 @@
 The
 .Fa prot
 argument contains unhandled bits.
-.It Bq Er EINVAL
+.It Bq Er ENOTSUP
 The
 .Fa prot
 argument contains permissions which are not a subset of the specified
Index: head/sys/vm/vm_mmap.c
===================================================================
--- head/sys/vm/vm_mmap.c
+++ head/sys/vm/vm_mmap.c
@@ -225,7 +225,7 @@
 	max_prot = PROT_MAX_EXTRACT(prot);
 	prot = PROT_EXTRACT(prot);
 	if (max_prot != 0 && (max_prot & prot) != prot)
-		return (EINVAL);
+		return (ENOTSUP);
 
 	p = td->td_proc;
 
@@ -668,7 +668,7 @@
 	vm_error = KERN_SUCCESS;
 	if (max_prot != 0) {
 		if ((max_prot & prot) != prot)
-			return (EINVAL);
+			return (ENOTSUP);
 		vm_error = vm_map_protect(&td->td_proc->p_vmspace->vm_map,
 		    addr, addr + size, max_prot, TRUE);
 	}