linux-kernel - Re: [PATCH v2 05/13] uprobes: add arch write opcode hook

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Message-ID: <52747280.7040708@linaro.org>
Date:	Fri, 01 Nov 2013 23:33:20 -0400
From:	David Long <dave.long@...aro.org>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	linux-arm-kernel@...ts.infradead.org, Rabin Vincent <rabin@....in>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/13] uprobes: add arch write opcode hook

On 10/29/13 15:59, Oleg Nesterov wrote:
> On 10/28, Oleg Nesterov wrote:
>>
>> Yes, yes, sorry for confusion. What I actually tried to suggest is
>> something like the trivial patch below.
>>
>> Then arm can do:
>>
>> 	uprobe_opcode_t arch_uprobe_swbp_insn(struct arch_uprobe *auprobe)
>> 	{
>> 		return __opcode_to_mem_arm(auprobe->bpinsn);
>> 	}
>>
>> No?
>>
>>> I notice there don't seem to be any alternative set_swbp functions
>>> in the (rc6) kernel tree
>>
>> Yes... I think we should simply make it "static". And set_orig_insn()
>> too.
>
> Or. arm can actually reimplement set_swbp(). This doesn't mean the
> duplication of write_opcode() code, we can simply export this helper.
>

That actually looks to me like the cleanest approach.  I have changed 
the static write_opcode() to a global uprobe_write_opcode(), and now 
call it from an arm set_swbp().

Please do *not* make set_swbp() (and set_orig_insn()) static's.  It 
looks like we now have a use for at least one of them.

Thanks,
-dl

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