linux-kernel - Re: [PATCH v8 1/2] kprobes: copy ainsn after alloc aggr kprobe

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Date:	Wed, 19 Nov 2014 09:53:59 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	<tixy@...aro.org>, <linux@....linux.org.uk>, <will.deacon@....com>,
	<dave.long@...aro.org>, <taras.kondratiuk@...aro.org>,
	<ben.dooks@...ethink.co.uk>, <cl@...ux.com>, <rabin@....in>,
	<davem@...emloft.net>, <lizefan@...wei.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v8 1/2] kprobes: copy ainsn after alloc aggr kprobe

On 2014/11/18 19:38, Masami Hiramatsu wrote:
> Hi Wang,
> 
> (2014/11/18 15:32), Wang Nan wrote:
>> Copy old kprobe to newly alloced optimized_kprobe before
>> arch_prepare_optimized_kprobe(). Original kprove can brings more
>> information to optimizer.
> 
> As I've asked you on the previous series, I prefer to transfer the
> original kprobes to arch_prepare_optimized_kprobe().
> 
> OK, now I'll send you my patch. If you can agree, feel free to
> pick that into your series.
> 

Sorry. The new version series has heavy code changes in checker. I think
I must miss real optprobes code during my coding. I will collect your
patch and adjust my code in the next version.

Thank you.

> Thank you,
> 
>>
>> v1 -> v2:
>>  -  Bugfix: copy p->addr when alloc_aggr_kprobe.
>>
>> Signed-off-by: Wang Nan <wangnan0@...wei.com>
>> ---
>>  kernel/kprobes.c | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
>> index 3995f54..e9868ec 100644
>> --- a/kernel/kprobes.c
>> +++ b/kernel/kprobes.c
>> @@ -730,7 +730,13 @@ static struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
>>  		return NULL;
>>  
>>  	INIT_LIST_HEAD(&op->list);
>> +
>> +	/*
>> +	 * copy gives arch_prepare_optimized_kprobe
>> +	 * more information
>> +	 */
>>  	op->kp.addr = p->addr;
>> +	copy_kprobe(p, &op->kp);
>>  	arch_prepare_optimized_kprobe(op);
>>  
>>  	return &op->kp;
>>
> 
> 


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