[PATCH] trace_syscalls: add missed field

[Lai Jiangshan <laijs@cn.fujitsu.com>]

Field syscall number is missed in syscall_enter_define_fields()/
syscall_exit_define_fields().

syscall number is also needed for event filter or other users.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 9189cbe..63aa807 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -261,6 +261,10 @@ int syscall_enter_define_fields(struct ftrace_event_call *call)
 	if (ret)
 		return ret;
 
+	ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER);
+	if (ret)
+		return ret;
+
 	for (i = 0; i < meta->nb_args; i++) {
 		ret = trace_define_field(call, meta->types[i],
 					 meta->args[i], offset,
@@ -281,6 +285,10 @@ int syscall_exit_define_fields(struct ftrace_event_call *call)
 	if (ret)
 		return ret;
 
+	ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER);
+	if (ret)
+		return ret;
+
 	ret = trace_define_field(call, SYSCALL_FIELD(long, ret),
 				 FILTER_OTHER);