linux-kernel - Re: [PATCH v3 6/7] vfio: platform: use list of registered reset function

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Message-ID: <562A4F1F.1040209@linaro.org>
Date:	Fri, 23 Oct 2015 17:15:43 +0200
From:	Eric Auger <eric.auger@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>, linux-arm-kernel@...ts.infradead.org
Cc:	b.reynal@...tualopensystems.com, kvm@...r.kernel.org,
	patches@...aro.org, linux-kernel@...r.kernel.org,
	alex.williamson@...hat.com, eric.auger@...com,
	kvmarm@...ts.cs.columbia.edu, christoffer.dall@...aro.org
Subject: Re: [PATCH v3 6/7] vfio: platform: use list of registered reset
 function

On 10/23/2015 04:23 PM, Arnd Bergmann wrote:
> On Friday 23 October 2015 16:11:08 Eric Auger wrote:
>> Hi Arnd,
>> On 10/23/2015 03:12 PM, Arnd Bergmann wrote:
>>> On Friday 23 October 2015 14:37:14 Eric Auger wrote:
>>>> Remove the static lookup table and use the dynamic list of registered
>>>> reset functions instead. Also load the reset module through its alias.
>>>> The reset struct module pointer is stored in vfio_platform_device.
>>>>
>>>> We also remove the useless struct device pointer parameter in
>>>> vfio_platform_get_reset.
>>>>
>>>> This patch fixes the issue related to the usage of __symbol_get, which
>>>> besides from being moot, prevented compilation with CONFIG_MODULES
>>>> disabled.
>>>>
>>>> Also usage of MODULE_ALIAS makes possible to add a new reset module
>>>> without needing to update the framework. This was suggested by Arnd.
>>>>
>>>> Signed-off-by: Eric Auger <eric.auger@...aro.org>
>>>> Reported-by: Arnd Bergmann <arnd@...db.de>
>>>>
>>>>
>>> Reviewed-by: Arnd Bergmann <arnd@...db.de>
>>>
>>> but doesn't this need to come before patch 4/7?
>> Well I don't think so. In [4] we introduce the dynamic registration
>> method but until this patch we still use the old lookup method in the
>> static table. I tested and the reset lookup still works in [4].
>> If we put this one before the registration, the functionality will be
>> lost here.
>>
> 
> Ok, I see. I was getting confused by the removal of the EXPORT_SYMBOL
> statement there and thought it would break the __get_symbol call.

Hum no actually you're right. I checked the reset module was loaded but
effectly the _get_symbol fails. So if I want to keep the functionality
all along the series I need to remove the EXPORT_SYMBOL when I swap the
lookup method.

Thanks

Eric
> 
> 	Arnd
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