diff --git a/ChangeLog b/ChangeLog
index 8c934b9cf5..115d3cbe03 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2018-02-06  Joseph Myers  <joseph@codesourcery.com>
+
+	* sysdeps/unix/sysv/linux/bits/mman-linux.h [__USE_MISC]
+	(MAP_SHARED_VALIDATE): New macro.
+	* sysdeps/unix/sysv/linux/hppa/bits/mman.h [__USE_MISC]
+	(MAP_SHARED_VALIDATE): Likewise.
+
 2018-02-05  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* elf/dl-addr.c (determine_info): Use ADDRIDX with DT_GNU_HASH.
diff --git a/sysdeps/unix/sysv/linux/bits/mman-linux.h b/sysdeps/unix/sysv/linux/bits/mman-linux.h
index e61212a7ea..70edeb6d60 100644
--- a/sysdeps/unix/sysv/linux/bits/mman-linux.h
+++ b/sysdeps/unix/sysv/linux/bits/mman-linux.h
@@ -42,6 +42,8 @@
 #define MAP_SHARED	0x01		/* Share changes.  */
 #define MAP_PRIVATE	0x02		/* Changes are private.  */
 #ifdef __USE_MISC
+# define MAP_SHARED_VALIDATE	0x03	/* Share changes and validate
+					   extension flags.  */
 # define MAP_TYPE	0x0f		/* Mask for type of mapping.  */
 #endif
 
diff --git a/sysdeps/unix/sysv/linux/hppa/bits/mman.h b/sysdeps/unix/sysv/linux/hppa/bits/mman.h
index 84ba0d6ba8..380be7b789 100644
--- a/sysdeps/unix/sysv/linux/hppa/bits/mman.h
+++ b/sysdeps/unix/sysv/linux/hppa/bits/mman.h
@@ -34,6 +34,8 @@
 #define MAP_SHARED	0x01		/* Share changes */
 #define MAP_PRIVATE	0x02		/* Changes are private */
 #ifdef __USE_MISC
+# define MAP_SHARED_VALIDATE	0x03	/* Share changes and validate
+					   extension flags.  */
 # define MAP_TYPE	0x03		/* Mask for type of mapping */
 #endif