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

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Date:	Tue, 22 Oct 2013 21:21:08 -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 04/13] uprobes: allow arch-specific initialization

On 10/19/13 12:42, Oleg Nesterov wrote:
> On 10/15, David Long wrote:
>>
>> Add a weak function for any architecture-specific initialization.  ARM
>> will use this to register the handlers for the undefined instructions it
>> uses to implement uprobes.
>
> Could you explain why ARM can't simply do the necessary initialization in
> arch/arm/kernel/uprobes-arm.c ?
>
>
>> +int __weak __init arch_uprobes_init(void)
>> +{
>> +	return 0;
>> +}
>> +
>>   static int __init init_uprobes(void)
>>   {
>> +	int ret;
>>   	int i;
>>
>>   	for (i = 0; i < UPROBES_HASH_SZ; i++)
>> @@ -1870,6 +1876,10 @@ static int __init init_uprobes(void)
>>   	if (percpu_init_rwsem(&dup_mmap_sem))
>>   		return -ENOMEM;
>>
>> +	ret = arch_uprobes_init();
>> +	if (ret)
>> +		return ret;
>> +
>>   	return register_die_notifier(&uprobe_exception_nb);
>>   }
>>   module_init(init_uprobes);
>
> IOW, why do we need to call arch_uprobes_init() from init_uprobes().
>
> Oleg
>

I don't know how you would do the initialization without invoking it 
through the module_init function, which I think you can only have one 
of.  Could you explain in more detail what you had in mind?

-dl

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