linux-kernel - Re: [PATCH v14 7/7] ARM: kprobes: enable OPTPROBES for ARM 32

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Date:	Mon, 8 Dec 2014 21:48:04 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	"Jon Medhurst (Tixy)" <tixy@...aro.org>
CC:	<masami.hiramatsu.pt@...achi.com>, <linux@....linux.org.uk>,
	<lizefan@...wei.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v14 7/7] ARM: kprobes: enable OPTPROBES for ARM 32

On 2014/12/8 21:22, Jon Medhurst (Tixy) wrote:
> On Mon, 2014-12-08 at 20:31 +0800, Wang Nan wrote:
>> On 2014/12/8 20:06, Wang Nan wrote:
>>> On 2014/12/8 19:50, Jon Medhurst (Tixy) wrote:
>>>> On Mon, 2014-12-08 at 19:15 +0800, Wang Nan wrote:
>>>>> On 2014/12/8 19:04, Jon Medhurst (Tixy) wrote:
>>>>>> On Mon, 2014-12-08 at 14:28 +0800, Wang Nan wrote:
>> [...]
>>>>
>>>> so another CPU could find and delete next before this one has finished
>>>> doing so. Would the list end up in a consistent state where no loops
>>>> develop and no probes are missed? I don't know the answer and a full
>>>> analysis would be complicated, but my gut feeling is that if a cpu can
>>>> observe the links in the list in an inconsistent state then only bad
>>>> things can result.
>>>>
>>>
>>> I see the problem.
>>>
>>> I'm thinking about making core.c and opt-arm.c to share stop_machine() code.
>>> stop_machine() is required when removing breakpoint, so I'd like to define
>>> a "remove_breakpoint" function in core.c and make opt-arm.c to call it.
>>> Do you think it is a good idea?
>>>
>>>
>>
>> What I mean is something like this:
> 
> Yes, that should work, though as remove_breakpoint is a globally visible
> symbol, I suggest a less generic name for it, perhaps
> remove_kprobe_breakpoint ?
> 

I don't think it is globally visible. Only files in arm/probes/kprobes
can include "core.h". However, I do agree that remove_breakpoint() is not
a good name. In my v15 patch, I'd like to rename it to kprobe_remove_breakpoint(),
due to may of names defined in core.h are called kprobes_xxx.

Thank you!


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