add new membarrier, userfaultfd and switch_endian syscalls
new in linux v4.3 added for aarch64, arm, i386, mips, or1k, powerpc,
x32 and x86_64.
membarrier is a system wide memory barrier, moves most of the
synchronization cost to one side, new in kernel commit
5b25b13ab08f616efd566347d809b4ece54570d1
userfaultfd is useful for qemu and is new in kernel commit
8d2afd96c20316d112e04d935d9e09150e988397
switch_endian is powerpc only for switching endianness, new in commit
529d235a0e190ded1d21ccc80a73e625ebcad09b
diff --git a/arch/aarch64/bits/syscall.h b/arch/aarch64/bits/syscall.h
index d7a1420..d64b437 100644
--- a/arch/aarch64/bits/syscall.h
+++ b/arch/aarch64/bits/syscall.h
@@ -265,6 +265,8 @@
#define __NR_memfd_create 279
#define __NR_bpf 280
#define __NR_execveat 281
+#define __NR_userfaultfd 282
+#define __NR_membarrier 283
#define SYS_io_setup __NR_io_setup
#define SYS_io_destroy __NR_io_destroy
@@ -533,3 +535,5 @@
#define SYS_memfd_create __NR_memfd_create
#define SYS_bpf __NR_bpf
#define SYS_execveat __NR_execveat
+#define SYS_userfaultfd __NR_userfaultfd
+#define SYS_membarrier __NR_membarrier