Index: head/sys/sys/mman.h
===================================================================
--- head/sys/sys/mman.h
+++ head/sys/sys/mman.h
@@ -69,8 +69,8 @@
 #define	MAP_FIXED	 0x0010	/* map addr must be exactly as requested */
 
 #if __BSD_VISIBLE
-#define	MAP_RENAME	 0x0020	/* Sun: rename private pages to file */
-#define	MAP_NORESERVE	 0x0040	/* Sun: don't reserve needed swap area */
+#define	MAP_RESERVED0020 0x0020	/* previously unimplemented MAP_RENAME */
+#define	MAP_RESERVED0040 0x0040	/* previously unimplemented MAP_NORESERVE */
 #define	MAP_RESERVED0080 0x0080	/* previously misimplemented MAP_INHERIT */
 #define	MAP_RESERVED0100 0x0100	/* previously unimplemented MAP_NOEXTEND */
 #define	MAP_HASSEMAPHORE 0x0200	/* region may contain semaphores */
Index: head/sys/sys/param.h
===================================================================
--- head/sys/sys/param.h
+++ head/sys/sys/param.h
@@ -58,7 +58,7 @@
  *		in the range 5 to 9.
  */
 #undef __FreeBSD_version
-#define __FreeBSD_version 1100038	/* Master, propagated to newvers */
+#define __FreeBSD_version 1100039	/* Master, propagated to newvers */
 
 /*
  * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
@@ -81,6 +81,7 @@
 #define	P_OSREL_SIGSEGV		700004
 #define	P_OSREL_MAP_ANON	800104
 #define	P_OSREL_MAP_FSTRICT	1100036
+#define	P_OSREL_MAP_RENAME	1100039
 
 #define	P_OSREL_MAJOR(x)	((x) / 100000)
 #endif
Index: head/sys/vm/vm_mmap.c
===================================================================
--- head/sys/vm/vm_mmap.c
+++ head/sys/vm/vm_mmap.c
@@ -220,6 +220,12 @@
 	fp = NULL;
 
 	/*
+	 * Ignore old flags that used to be defined but did not do anything.
+	 */
+	if (td->td_proc->p_osrel < P_OSREL_MAP_RENAME)
+		flags &= ~(MAP_RESERVED0020 | MAP_RESERVED0040);
+	
+	/*
 	 * Enforce the constraints.
 	 * Mapping of length 0 is only allowed for old binaries.
 	 * Anonymous mapping shall specify -1 as filedescriptor and
@@ -244,9 +250,9 @@
 		flags |= MAP_ANON;
 		pos = 0;
 	}
-	if ((flags & ~(MAP_SHARED | MAP_PRIVATE | MAP_FIXED | MAP_RENAME |
-	    MAP_NORESERVE | MAP_HASSEMAPHORE | MAP_STACK | MAP_NOSYNC |
-	    MAP_ANON | MAP_EXCL | MAP_NOCORE | MAP_PREFAULT_READ |
+	if ((flags & ~(MAP_SHARED | MAP_PRIVATE | MAP_FIXED | MAP_HASSEMAPHORE |
+	    MAP_STACK | MAP_NOSYNC | MAP_ANON | MAP_EXCL | MAP_NOCORE |
+	    MAP_PREFAULT_READ |
 #ifdef MAP_32BIT
 	    MAP_32BIT |
 #endif
Index: head/usr.bin/truss/syscalls.c
===================================================================
--- head/usr.bin/truss/syscalls.c
+++ head/usr.bin/truss/syscalls.c
@@ -312,8 +312,8 @@
 };
 
 static struct xlat mmap_flags[] = {
-	X(MAP_SHARED) X(MAP_PRIVATE) X(MAP_FIXED) X(MAP_RENAME)
-	X(MAP_NORESERVE) X(MAP_RESERVED0080) X(MAP_RESERVED0100)
+	X(MAP_SHARED) X(MAP_PRIVATE) X(MAP_FIXED) X(MAP_RESERVED0020)
+	X(MAP_RESERVED0040) X(MAP_RESERVED0080) X(MAP_RESERVED0100)
 	X(MAP_HASSEMAPHORE) X(MAP_STACK) X(MAP_NOSYNC) X(MAP_ANON)
 	X(MAP_NOCORE) X(MAP_PREFAULT_READ)
 #ifdef MAP_32BIT