From c906d2c74e0bb9059fbf43e21f8a962986eb21e2 Mon Sep 17 00:00:00 2001
From: Nicholas Piggin <npiggin@gmail.com>
Date: Sat, 12 May 2018 13:35:24 +1000
Subject: [PATCH] selftests/powerpc: fix exec benchmark

The exec_target binary could segfault calling _exit(2) because r13
is not set up properly (and libc looks at that when performing a
syscall). Call SYS_exit using syscall(2) which doesn't seem to
have this problem.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 tools/testing/selftests/powerpc/benchmarks/exec_target.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/powerpc/benchmarks/exec_target.c b/tools/testing/selftests/powerpc/benchmarks/exec_target.c
index 3c9c144192be..c14b0fc1edde 100644
--- a/tools/testing/selftests/powerpc/benchmarks/exec_target.c
+++ b/tools/testing/selftests/powerpc/benchmarks/exec_target.c
@@ -6,8 +6,11 @@
  * Copyright 2018, Anton Blanchard, IBM Corp.
  */
 
-void _exit(int);
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+
 void _start(void)
 {
-	_exit(0);
+	syscall(SYS_exit, 0);
 }