linux-kernel - Re: [PATCH] perf: fix possible divide-by-zero in perf_swevent

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Date:	Mon, 25 Oct 2010 13:58:20 +0800
From:	DDD <dongdong.deng@...driver.com>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>
CC:	mingo@...e.hu, acme@...hat.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: fix possible divide-by-zero in	perf_swevent_overflow()

Frederic Weisbecker wrote:
> On Fri, Aug 27, 2010 at 09:19:39PM +0800, DDD wrote:
>> Peter Zijlstra wrote:
>>> On Fri, 2010-08-27 at 20:21 +0800, DDD wrote:
>>>
>>>>>> Maybe the root cause was from kgdb/hw_breakpoint_layer,
>>>>> Yeah, I think there's a bug in the hw_breakpoint stuff, does something
>>>>> like the below fix it?
>>>> Thanks for your patch, but I still could reproduce the problem with 
>>>> your patch.
>>> Frederic, any clue as to what makes hw breakpoints go funny and have
>>> last_period == 0?
>> Hi Peter,
>>
>> Thanks for you take care of it, I have got the root cause of it now.
>>
>> It is the kgdb using hw_breakpoint_layer's API problem, and I have a RFC  
>> patch for it.(maybe it is not correctly), I will contact with Jason to  
>> fix this problem.
>>
>> Thank you very much,
>> Dongdong
> 
> 
> Thanks!
> 
> We are waiting for your patch then.

Hello Frederic,

Sorry for delay, the patch have been accepted by Jason.

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c1bb9a9c1911036549c5cdfb23f32d7d20ffdc5a

Dongdong
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