diff --git a/bits/sysmacros.h b/bits/sysmacros.h
new file mode 100644
index 0000000..e2c0bc2
--- /dev/null
+++ b/bits/sysmacros.h
@@ -0,0 +1,74 @@
+/* Definitions of macros to access `dev_t' values.
+   Copyright (C) 1996-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_SYSMACROS_H
+#define _BITS_SYSMACROS_H 1
+
+#ifndef _SYS_SYSMACROS_H
+# error "Never include <bits/sysmacros.h> directly; use <sys/sysmacros.h> instead."
+#endif
+
+/* dev_t in glibc is a 64-bit quantity, with 32-bit major and minor numbers.
+   Our default encoding is MMMM Mmmm mmmM MMmm, where M is a hex digit of
+   the major number and m is a hex digit of the minor number.  This is
+   downward compatible with legacy systems where dev_t is 16 bits wide,
+   encoded as MMmm.  It is also downward compatible with the Linux kernel,
+   which (as of 2016) uses 32-bit dev_t, encoded as mmmM MMmm.
+
+   Systems that use an incompatible encoding for dev_t should override this
+   file in the appropriate sysdeps subdirectory.  */
+
+#define __SYSMACROS_DECLARE_MAJOR(DECL_TEMPL)			\
+  DECL_TEMPL(unsigned int, major, (__dev_t __dev))
+
+#define __SYSMACROS_DEFINE_MAJOR(DECL_TEMPL)			\
+  __SYSMACROS_DECLARE_MAJOR (DECL_TEMPL)			\
+  {								\
+    unsigned int __major;					\
+    __major  = ((__dev & (__dev_t) 0x00000000000fff00u) >>  8); \
+    __major |= ((__dev & (__dev_t) 0xfffff00000000000u) >> 32); \
+    return __major;						\
+  }
+
+#define __SYSMACROS_DECLARE_MINOR(DECL_TEMPL)			\
+  DECL_TEMPL(unsigned int, minor, (__dev_t __dev))
+
+#define __SYSMACROS_DEFINE_MINOR(DECL_TEMPL)			\
+  __SYSMACROS_DECLARE_MINOR (DECL_TEMPL)			\
+  {								\
+    unsigned int __minor;					\
+    __minor  = ((__dev & (__dev_t) 0x00000000000000ffu) >>  0); \
+    __minor |= ((__dev & (__dev_t) 0x00000ffffff00000u) >> 12); \
+    return __minor;						\
+  }
+
+#define __SYSMACROS_DECLARE_MAKEDEV(DECL_TEMPL)			\
+  DECL_TEMPL(__dev_t, makedev, (unsigned int __major, unsigned int __minor))
+
+#define __SYSMACROS_DEFINE_MAKEDEV(DECL_TEMPL)			\
+  __SYSMACROS_DECLARE_MAKEDEV (DECL_TEMPL)			\
+  {								\
+    __dev_t __dev;						\
+    __dev  = (((__dev_t) (__major & 0x00000fffu)) <<  8);	\
+    __dev |= (((__dev_t) (__major & 0xfffff000u)) << 32);	\
+    __dev |= (((__dev_t) (__minor & 0x000000ffu)) <<  0);	\
+    __dev |= (((__dev_t) (__minor & 0xffffff00u)) << 12);	\
+    return __dev;						\
+  }
+
+#endif /* bits/sysmacros.h */
diff --git a/include/sys/sysmacros.h b/include/sys/sysmacros.h
new file mode 100644
index 0000000..87813c5
--- /dev/null
+++ b/include/sys/sysmacros.h
@@ -0,0 +1 @@
+#include <misc/sys/sysmacros.h>
diff --git a/misc/Makefile b/misc/Makefile
index 56e20ce..3d2ebb8 100644
--- a/misc/Makefile
+++ b/misc/Makefile
@@ -34,7 +34,8 @@ headers	:= sys/uio.h bits/uio.h sys/ioctl.h bits/ioctls.h bits/ioctl-types.h \
 	   regexp.h bits/select.h bits/mman.h sys/xattr.h \
 	   syslog.h sys/syslog.h \
 	   bits/syslog.h bits/syslog-ldbl.h bits/syslog-path.h bits/error.h \
-	   bits/select2.h bits/hwcap.h sys/auxv.h
+	   bits/select2.h bits/hwcap.h sys/auxv.h \
+	   sys/sysmacros.h bits/sysmacros.h
 
 routines := brk sbrk sstk ioctl \
 	    readv writev preadv preadv64 pwritev pwritev64 \
@@ -67,7 +68,7 @@ routines := brk sbrk sstk ioctl \
 	    getloadavg getclktck \
 	    fgetxattr flistxattr fremovexattr fsetxattr getxattr \
 	    listxattr lgetxattr llistxattr lremovexattr lsetxattr \
-	    removexattr setxattr getauxval ifunc-impl-list
+	    removexattr setxattr getauxval ifunc-impl-list makedev
 
 generated += tst-error1.mtrace tst-error1-mem.out
 
@@ -78,7 +79,7 @@ gpl2lgpl := error.c error.h
 tests := tst-dirname tst-tsearch tst-fdset tst-efgcvt tst-mntent tst-hsearch \
 	 tst-error1 tst-pselect tst-insremque tst-mntent2 bug-hsearch1 \
 	 tst-mntent-blank-corrupt tst-mntent-blank-passno bug18240 \
-	 tst-preadvwritev tst-preadvwritev64
+	 tst-preadvwritev tst-preadvwritev64 tst-makedev
 ifeq ($(run-built-tests),yes)
 tests-special += $(objpfx)tst-error1-mem.out
 endif
diff --git a/misc/Versions b/misc/Versions
index 671f487..afa22bd 100644
--- a/misc/Versions
+++ b/misc/Versions
@@ -152,6 +152,9 @@ libc {
   GLIBC_2.23 {
     # SHLIB_COMPAT(GLIBC_2_0, GLIBC_2_23) used in regexp.c
   }
+  GLIBC_2.24 {
+    gnu_dev_major; gnu_dev_minor; gnu_dev_makedev;
+  }
   GLIBC_PRIVATE {
     __madvise;
     __mktemp;
diff --git a/misc/makedev.c b/misc/makedev.c
new file mode 100644
index 0000000..7303fb6
--- /dev/null
+++ b/misc/makedev.c
@@ -0,0 +1,30 @@
+/* Definitions of functions to access `dev_t' values.
+   Copyright (C) 2003-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <features.h>
+
+#undef __USE_EXTERN_INLINES
+#define __SYSMACROS_NEED_IMPLEMENTATION
+#include <sys/sysmacros.h>
+
+#define OUT_OF_LINE_IMPL_TEMPL(rtype, name, proto) \
+  rtype gnu_dev_##name proto
+
+__SYSMACROS_DEFINE_MAJOR(OUT_OF_LINE_IMPL_TEMPL)
+__SYSMACROS_DEFINE_MINOR(OUT_OF_LINE_IMPL_TEMPL)
+__SYSMACROS_DEFINE_MAKEDEV(OUT_OF_LINE_IMPL_TEMPL)
diff --git a/misc/sys/sysmacros.h b/misc/sys/sysmacros.h
new file mode 100644
index 0000000..dc2eb83
--- /dev/null
+++ b/misc/sys/sysmacros.h
@@ -0,0 +1,64 @@
+/* Definitions of macros to access `dev_t' values.
+   Copyright (C) 1996-2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SYSMACROS_H
+#define _SYS_SYSMACROS_H 1
+
+#include <features.h>
+#include <bits/types.h>
+#include <bits/sysmacros.h>
+
+#define __SYSMACROS_DECL_TEMPL(rtype, name, proto)			     \
+  extern rtype gnu_dev_##name proto __THROW __attribute_const__;
+
+#define __SYSMACROS_IMPL_TEMPL(rtype, name, proto)			     \
+  __extension__ __extern_inline __attribute_const__ rtype		     \
+  __NTH (gnu_dev_##name proto)
+
+__BEGIN_DECLS
+
+__SYSMACROS_DECLARE_MAJOR (__SYSMACROS_DECL_TEMPL)
+__SYSMACROS_DECLARE_MINOR (__SYSMACROS_DECL_TEMPL)
+__SYSMACROS_DECLARE_MAKEDEV (__SYSMACROS_DECL_TEMPL)
+
+#ifdef __USE_EXTERN_INLINES
+
+__SYSMACROS_DEFINE_MAJOR (__SYSMACROS_IMPL_TEMPL)
+__SYSMACROS_DEFINE_MINOR (__SYSMACROS_IMPL_TEMPL)
+__SYSMACROS_DEFINE_MAKEDEV (__SYSMACROS_IMPL_TEMPL)
+
+#endif
+
+__END_DECLS
+
+#ifndef __SYSMACROS_NEED_IMPLEMENTATION
+# undef __SYSMACROS_DECL_TEMPL
+# undef __SYSMACROS_IMPL_TEMPL
+# undef __SYSMACROS_DECLARE_MAJOR
+# undef __SYSMACROS_DECLARE_MINOR
+# undef __SYSMACROS_DECLARE_MAKEDEV
+# undef __SYSMACROS_DEFINE_MAJOR
+# undef __SYSMACROS_DEFINE_MINOR
+# undef __SYSMACROS_DEFINE_MAKEDEV
+#endif
+
+#define major(dev) gnu_dev_major (dev)
+#define minor(dev) gnu_dev_minor (dev)
+#define makedev(maj, min) gnu_dev_makedev (maj, min)
+
+#endif /* sys/sysmacros.h */
diff --git a/misc/tst-makedev.c b/misc/tst-makedev.c
new file mode 100644
index 0000000..b330b5a
--- /dev/null
+++ b/misc/tst-makedev.c
@@ -0,0 +1,104 @@
+/* Tests of functions to access `dev_t' values.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sys/types.h>
+#include <sys/sysmacros.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+/* Confirm that makedev (major (d), minor (d)) == d.  */
+static int
+do_test_split_combine (dev_t d1)
+{
+  unsigned int maj = major (d1);
+  unsigned int min = minor (d1);
+  dev_t d2 = makedev (maj, min);
+  if (d1 != d2)
+    {
+      printf ("FAIL: %016" PRIx64 " != %016" PRIx64 " (maj %08x min %08x)\n",
+	      (uint64_t)d2, (uint64_t)d1, maj, min);
+      return 1;
+    }
+  else
+    return 0;
+}
+
+/* Confirm that major (makedev (maj, min)) == maj and
+   minor (makedev (maj, min)) == min.  */
+static int
+do_test_combine_split (unsigned int maj1, unsigned int min1)
+{
+  dev_t d = makedev (maj1, min1);
+  unsigned int maj2 = major (d);
+  unsigned int min2 = minor (d);
+  if (maj1 != maj2 && min1 != min2)
+    {
+      printf ("FAIL: %08x != %08x, %08x != %08x (dev %016" PRIx64 ")\n",
+	      maj2, maj1, min2, min1, (uint64_t)d);
+      return 1;
+    }
+  else if (maj1 != maj2)
+    {
+      printf ("FAIL: %08x != %08x, %08x == %08x (dev %016" PRIx64 ")\n",
+	      maj2, maj1, min2, min1, (uint64_t)d);
+      return 1;
+    }
+  else if (min1 != min2)
+    {
+      printf ("FAIL: %08x == %08x, %08x != %08x (dev %016" PRIx64 ")\n",
+	      maj2, maj1, min2, min1, (uint64_t)d);
+      return 1;
+    }
+  else
+    return 0;
+}
+
+static int
+do_test (void)
+{
+  dev_t d;
+  unsigned int maj, min;
+  int status = 0;
+
+  /* Test the traditional range (16-bit dev_t, 8-bit each maj/min)
+     exhaustively.  */
+  for (d = 0; d <= 0xFFFF; d++)
+    status |= do_test_split_combine (d);
+
+  for (maj = 0; maj <= 0xFF; maj++)
+    for (min = 0; min <= 0xFF; min++)
+      status |= do_test_combine_split (maj, min);
+
+  /* Test glibc's expanded range (64-bit dev_t, 32-bit each maj/min).
+     Exhaustive testing would take much too long, instead we shift a
+     pair of 1-bits over each range.  */
+  {
+    unsigned int a, b;
+    for (a = 0; a <= 63; a++)
+      do_test_split_combine (((dev_t) 0x03) << a);
+
+    for (a = 0; a < 31; a++)
+      for (b = 0; b <= 31; b++)
+	do_test_combine_split (0x03u << a, 0x03u << b);
+  }
+
+  return status;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/posix/Makefile b/posix/Makefile
index 5b0e298..3a7719e 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -29,7 +29,7 @@ headers	:= sys/utsname.h sys/times.h sys/wait.h sys/types.h unistd.h	      \
 	   bits/local_lim.h tar.h bits/utsname.h bits/confname.h	      \
 	   bits/waitflags.h bits/waitstatus.h sys/unistd.h sched.h	      \
 	   bits/sched.h re_comp.h wait.h bits/environments.h cpio.h	      \
-	   sys/sysmacros.h spawn.h bits/unistd.h
+	   spawn.h bits/unistd.h
 
 routines :=								      \
 	uname								      \
diff --git a/sysdeps/arm/nacl/libc.abilist b/sysdeps/arm/nacl/libc.abilist
index 2f7751d..87b7139 100644
--- a/sysdeps/arm/nacl/libc.abilist
+++ b/sysdeps/arm/nacl/libc.abilist
@@ -1840,4 +1840,8 @@ GLIBC_2.23 fts64_close F
 GLIBC_2.23 fts64_open F
 GLIBC_2.23 fts64_read F
 GLIBC_2.23 fts64_set F
+GLIBC_2.24 GLIBC_2.24 A
 GLIBC_2.24 quick_exit F
+GLIBC_2.24 gnu_dev_major F
+GLIBC_2.24 gnu_dev_makedev F
+GLIBC_2.24 gnu_dev_minor F
diff --git a/sysdeps/generic/sys/sysmacros.h b/sysdeps/generic/sys/sysmacros.h
deleted file mode 100644
index 4cc5961..0000000
--- a/sysdeps/generic/sys/sysmacros.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/* Definitions of macros to access `dev_t' values.
-   Copyright (C) 1996-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#ifndef _SYS_SYSMACROS_H
-#define _SYS_SYSMACROS_H	1
-
-/* For compatibility we provide alternative names.
-
-   The problem here is that compilers other than GCC probably don't
-   have the `long long' type and so `dev_t' is actually an array.  */
-#define major(dev) ((int)(((unsigned int) (dev) >> 8) & 0xff))
-#define minor(dev) ((int)((dev) & 0xff))
-#define makedev(major, minor) (((major) << 8) | (minor))
-
-#endif /* sys/sysmacros.h */
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 35e1ed4..f0b052d 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -15,7 +15,7 @@ ifeq ($(subdir),misc)
 include $(firstword $(wildcard $(sysdirs:=/sysctl.mk)))
 
 sysdep_routines += clone llseek umount umount2 readahead \
-		   setfsuid setfsgid makedev epoll_pwait signalfd \
+		   setfsuid setfsgid epoll_pwait signalfd \
 		   eventfd eventfd_read eventfd_write prlimit \
 		   personality
 
diff --git a/sysdeps/unix/sysv/linux/makedev.c b/sysdeps/unix/sysv/linux/makedev.c
deleted file mode 100644
index 68c18ca..0000000
--- a/sysdeps/unix/sysv/linux/makedev.c
+++ /dev/null
@@ -1,40 +0,0 @@
-/* Definitions of functions to access `dev_t' values.
-   Copyright (C) 2003-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <endian.h>
-#include <sys/sysmacros.h>
-
-unsigned int
-gnu_dev_major (unsigned long long int dev)
-{
-  return ((dev >> 8) & 0xfff) | ((unsigned int) (dev >> 32) & ~0xfff);
-}
-
-unsigned int
-gnu_dev_minor (unsigned long long int dev)
-{
-  return (dev & 0xff) | ((unsigned int) (dev >> 12) & ~0xff);
-}
-
-unsigned long long int
-gnu_dev_makedev (unsigned int major, unsigned int minor)
-{
-  return ((minor & 0xff) | ((major & 0xfff) << 8)
-	  | (((unsigned long long int) (minor & ~0xff)) << 12)
-	  | (((unsigned long long int) (major & ~0xfff)) << 32));
-}
diff --git a/sysdeps/unix/sysv/linux/sys/sysmacros.h b/sysdeps/unix/sysv/linux/sys/sysmacros.h
deleted file mode 100644
index 4c4a697..0000000
--- a/sysdeps/unix/sysv/linux/sys/sysmacros.h
+++ /dev/null
@@ -1,65 +0,0 @@
-/* Definitions of macros to access `dev_t' values.
-   Copyright (C) 1996-2016 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#ifndef _SYS_SYSMACROS_H
-#define _SYS_SYSMACROS_H	1
-
-#include <features.h>
-
-__BEGIN_DECLS
-
-__extension__
-extern unsigned int gnu_dev_major (unsigned long long int __dev)
-     __THROW __attribute_const__;
-__extension__
-extern unsigned int gnu_dev_minor (unsigned long long int __dev)
-     __THROW __attribute_const__;
-__extension__
-extern unsigned long long int gnu_dev_makedev (unsigned int __major,
-					       unsigned int __minor)
-     __THROW __attribute_const__;
-
-#ifdef __USE_EXTERN_INLINES
-__extension__ __extern_inline __attribute_const__ unsigned int
-__NTH (gnu_dev_major (unsigned long long int __dev))
-{
-  return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
-}
-
-__extension__ __extern_inline __attribute_const__ unsigned int
-__NTH (gnu_dev_minor (unsigned long long int __dev))
-{
-  return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
-}
-
-__extension__ __extern_inline __attribute_const__ unsigned long long int
-__NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor))
-{
-  return ((__minor & 0xff) | ((__major & 0xfff) << 8)
-	  | (((unsigned long long int) (__minor & ~0xff)) << 12)
-	  | (((unsigned long long int) (__major & ~0xfff)) << 32));
-}
-#endif
-__END_DECLS
-
-/* Access the functions with their traditional names.  */
-#define major(dev) gnu_dev_major (dev)
-#define minor(dev) gnu_dev_minor (dev)
-#define makedev(maj, min) gnu_dev_makedev (maj, min)
-
-#endif /* sys/sysmacros.h */
