[PATCH] [fix for stable] tracing: Fix irqs-off tag display in syscall tracing

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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@xxxxxxxxxx>
---
 kernel/trace/trace_syscalls.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index e675182..c9ce09a 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -358,6 +358,9 @@ void ftrace_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
 	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);
-- 
1.7.9.7


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