ppc64: ptrace signal fix

arch/ppc64/kernel/ptrace.c

@@ -292,11 +292,11 @@ void do_syscall_trace(void)
 		return;
 	if (!(current->ptrace & PT_PTRACED))
 		return;
-	current->exit_code = SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
-					? 0x80 : 0);
-	current->state = TASK_STOPPED;
-	notify_parent(current, SIGCHLD);
-	schedule();
+	/* the 0x80 provides a way for the tracing parent to distinguish
+	   between a syscall stop and SIGTRAP delivery */
+	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
+				 ? 0x80 : 0));
+
 	/*
 	 * this isn't the same as continuing with a signal, but it will do
 	 * for normal use.  strace only continues with a signal if the