linux-kernel - Re: [PATCH v2 04/13] uprobes: allow arch-specific initialization

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Date:	Sun, 03 Nov 2013 22:24:51 -0500
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 04/13] uprobes: allow arch-specific initialization

On 11/01/13 09:52, Oleg Nesterov wrote:
> On 10/31, David Long wrote:
>> On 10/28/13 14:58, Oleg Nesterov wrote:
>>> On 10/22, David Long wrote:
>>> I simply do not understand why uprobes.c uses module_init/module_exit,
>>> it can't be compiled as a module.
>>
>> I guess that makes sense, assuming it can never be made a module.  I saw
>> you recent commit for this.
>>
>>> I think that module_exit/exit_uprobes should be killed, and module_init()
>>> should be turned into __initcall(). uprobes-arm.c can have another one.
>>>
>>
>> I will see if I can make this work.
>
> If this can't work, then we need the new hook (this patch). But in this
> case please update the changelog to explain the reason.
>
>> Right now the arch-specific
>> initialization call is done in the middle of the generic initialization
>> code, but I don't know that it *has* to be that way.  I have some
>> concern too about getting the order right, since these are built from
>> different makefiles.
>
> Not sure I understand... But grep shows a lot of core_initcall()'s in
> arch/arm/ which do register_undef_hook(). And I guess you can use any
> initcall level.

Just to close on this, I implemented your suggested __initcall change 
and it tested out fine.

-dl


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