posix: Consolidate Linux fsync syscall

This patch consolidates the fsync Linux syscall generation on
sysdeps/unix/sysv/linux/fsync.c.  It basically removes it from
architectures auto-generation list.

For arm it also removes the __errno_location call since fsync
is not called with SYSCALL_CANCEL with call arch-specific
INLINE_SYSCALL macro which in turn will call __set_errno macro
(and setting errno directly).

Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
arch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu,
sparc64-linux-gnu, and sparcv9-linux-gnu.

	* misc/Makefile (CFLAGS-fsync.c): New flag.
	* nptl/Makefile (CFLAGS-fsync.c): Likewise.
	* sysdeps/unix/syscalls.list (fsync): Remove from auto-generation
	syscall list.
	* sysdeps/unix/sysv/linux/fsync.c: New file.
	* sysdeps/unix/sysv/linux/arm/localplt.data [libpthread.so]
	(__errno_location): Remove.

2 files changed, 28 insertions, 1 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/localplt.data b/sysdeps/unix/sysv/linux/arm/localplt.data
index 8bc876dd03..19d3299d98 100644
--- a/sysdeps/unix/sysv/linux/arm/localplt.data
+++ b/sysdeps/unix/sysv/linux/arm/localplt.data
@@ -5,7 +5,6 @@ libc.so: memalign
 libc.so: raise
 libc.so: realloc
 libm.so: matherr
-libpthread.so: __errno_location
 libpthread.so: raise
 # The dynamic loader needs __tls_get_addr for TLS.
 ld.so: __tls_get_addr
diff --git a/sysdeps/unix/sysv/linux/fsync.c b/sysdeps/unix/sysv/linux/fsync.c
new file mode 100644
index 0000000000..ac4827bd5e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fsync.c
@@ -0,0 +1,28 @@
+/* Synchronize a file's in-core state with storage device Linux
+   implementation.
+   Copyright (C) 2017 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 <unistd.h>
+#include <sysdep-cancel.h>
+
+/* Make all changes done to FD actually appear on disk.  */
+int
+fsync (int fd)
+{
+  return SYSCALL_CANCEL (fsync, fd);
+}