[ Untested on this architecture. To try it out: fetch linux-next/akpm,
  apply this patch, build/run a membarrier-enabled kernel, and do make
  kselftest. ]

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: linux-api@vger.kernel.org
CC: Richard Henderson <redacted>
CC: Ivan Kokshaysky <redacted>
CC: Matt Turner <mattst88@gmail.com>
CC: linux-alpha@vger.kernel.org
---
 arch/alpha/include/uapi/asm/unistd.h | 1 +
 arch/alpha/kernel/systbls.S          | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/alpha/include/uapi/asm/unistd.h b/arch/alpha/include/uapi/asm/unistd.h
index aa33bf5..7725619 100644
--- a/arch/alpha/include/uapi/asm/unistd.h
+++ b/arch/alpha/include/uapi/asm/unistd.h

@@ -475,5 +475,6 @@
 #define __NR_getrandom			511
 #define __NR_memfd_create		512
 #define __NR_execveat			513
+#define __NR_membarrier			514
 
 #endif /* _UAPI_ALPHA_UNISTD_H */

diff --git a/arch/alpha/kernel/systbls.S b/arch/alpha/kernel/systbls.S
index 9b62e3f..1ea64f4 100644
--- a/arch/alpha/kernel/systbls.S
+++ b/arch/alpha/kernel/systbls.S

@@ -532,6 +532,7 @@ sys_call_table:
 	.quad sys_getrandom
 	.quad sys_memfd_create
 	.quad sys_execveat
+	.quad sys_membarrier
 
 	.size sys_call_table, . - sys_call_table
 	.type sys_call_table, @object

-- 
1.9.1