posix: Consolidate Linux msync syscall

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

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-msync.c): New rule.
	* nptl/Makefile (CFLAGS-msync.c): Likewise.
	* sysdeps/unix/syscalls.list: Remove msync from auto-generation list.
	* sysdeps/unix/sysv/linux/msync.c: New file.

ChangeLog

@@ -1,5 +1,10 @@
 2017-05-18  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
+	* misc/Makefile (CFLAGS-msync.c): New rule.
+	* nptl/Makefile (CFLAGS-msync.c): Likewise.
+	* sysdeps/unix/syscalls.list: Remove msync from auto-generation list.
+	* sysdeps/unix/sysv/linux/msync.c: New file.
+
 	* sysdeps/unix/sysv/linux/alpha/sigsuspend.S: Remove file.
 	* sysdeps/unix/sysv/linux/sigsuspend.c: Simplify include list.
 	* nptl/Makefile (CFLAGS-sigsuspend.c): New rule.

misc/Makefile

@@ -108,6 +108,7 @@ CFLAGS-getsysstats.c = -fexceptions
 CFLAGS-getusershell.c = -fexceptions
 CFLAGS-err.c = -fexceptions
 CFLAGS-tst-tsearch.c = $(stack-align-test-flags)
+CFLAGS-msync.c = -fexceptions -fasynchronous-unwind-tables
 
 # Called during static library initialization, so turn stack-protection
 # off for non-shared builds.

nptl/Makefile

@@ -218,6 +218,7 @@ CFLAGS-read.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-write.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-nanosleep.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-sigsuspend.c = -fexceptions -fasynchronous-unwind-tables
+CFLAGS-msync.c = -fexceptions -fasynchronous-unwind-tables
 
 CFLAGS-pt-system.c = -fexceptions
 

sysdeps/unix/syscalls.list

@@ -45,7 +45,6 @@ madvise		-	madvise		i:pii	__madvise	madvise
 mkdir		-	mkdir		i:si	__mkdir		mkdir
 mmap		-	mmap		b:aniiii __mmap		mmap
 mprotect	-	mprotect	i:aii	__mprotect	mprotect
-msync		-	msync		Ci:aii	__libc_msync	msync
 munmap		-	munmap		i:ai	__munmap	munmap
 open		-	open		Ci:siv	__libc_open __open open
 profil		-	profil		i:piii	__profil	profil

sysdeps/unix/sysv/linux/msync.c

@@ -0,0 +1,26 @@
+/* Linux synchronize a file with a memory map 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 <sys/mman.h>
+#include <sysdep-cancel.h>
+
+int
+msync (void *addr, size_t length, int flags)
+{
+  return SYSCALL_CANCEL (msync, addr, length, flags);
+}