s390/s390x: allocate sys_membarrier system call number

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: linux-api@vger.kernel.org
CC: Heiko Carstens <heiko.carstens@de.ibm.com>
CC: linux-s390@vger.kernel.org
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/uapi/asm/unistd.h

@@ -291,7 +291,8 @@
 #define __NR_s390_pci_mmio_read		353
 #define __NR_execveat		354
 #define __NR_userfaultfd	355
-#define NR_syscalls 356
+#define __NR_membarrier		356
+#define NR_syscalls 357
 
 /* 
  * There are some system calls that are not present on 64 bit, some

arch/s390/kernel/syscalls.S

@@ -364,3 +364,4 @@ SYSCALL(sys_s390_pci_mmio_write,compat_sys_s390_pci_mmio_write)
 SYSCALL(sys_s390_pci_mmio_read,compat_sys_s390_pci_mmio_read)
 SYSCALL(sys_execveat,compat_sys_execveat)
 SYSCALL(sys_userfaultfd,sys_userfaultfd)		/* 355 */
+SYSCALL(sys_membarrier,sys_membarrier)