[ 05/23] tracing: Fix irqs-off tag display in syscall tracing

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "zhangwei(Jovi)" <jovi.zhangwei@huawei.com>

commit 11034ae9c20f4057a6127fc965906417978e69b2 upstream

Initialization of variable irq_flags and pc was missed when backport
11034ae9c to linux-3.0.y and linux-3.4.y, my fault.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 kernel/trace/trace_syscalls.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -357,6 +357,9 @@ void ftrace_syscall_exit(void *ignore, s
 	if (!sys_data)
 		return;
 
+	local_save_flags(irq_flags);
+	pc = preempt_count();
+
 	event = trace_current_buffer_lock_reserve(&buffer,
 			sys_data->exit_event->event.type, sizeof(*entry),
 			irq_flags, pc);