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

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On 2013/7/29 11:02, Li Zefan wrote:
> On 2013/7/29 9:33, zhangwei(Jovi) wrote:
>> commit 11034ae9c20f4057a6127fc965906417978e69b2 upstream
>>
> 
> I don't think the stable versions that contain this fix have been released,
> so I think you should ask Greg to drop the patch and resend the patch with
> this fix folded.
> 
Unfortunately not, the bug already released in 3.0.88 and 3.4.55.

>> 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);
>>
> 
> 
> .
> 


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