linux-kernel - Re: [PATCH] gpio: thunderx: select IRQ_DOMAIN

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Date:   Wed, 6 Sep 2017 10:36:06 -0700
From:   David Daney <ddaney@...iumnetworks.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        David Daney <ddaney@...iumnetworks.com>
Cc:     linux-gpio@...r.kernel.org, David Daney <david.daney@...ium.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: thunderx: select IRQ_DOMAIN_HIERARCHY instead of
 depends on

On 09/05/2017 09:20 PM, Masahiro Yamada wrote:
> Hi David,
> 
> 
> 2017-09-06 11:09 GMT+09:00 David Daney <ddaney@...iumnetworks.com>:
>> On 09/05/2017 06:40 PM, Masahiro Yamada wrote:
>>>
>>> IRQ_DOMAIN_HIERARCHY is not user-configurable, but supposed to be
>>> selected by drivers that need IRQ domain hierarchy support.
>>>
>>> GPIO_THUNDERX is the only user of "depends on IRQ_DOMAIN_HIERARCHY".
>>> This means, we can not enable GPIO_THUNDERX unless other drivers
>>> select IRQ_DOMAIN_HIERARCHY elsewhere.  This is odd.  Flip the logic.
>>>
>>> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>>
>>
>> IRQ_DOMAIN_HIERARCHY is set as a result of ARCH_THUNDER (this SoC hardware),
>> so it actually works as-is.
> 
> 
> Right, ARCH_THUNDER does not select it directly,
> but does it indirectly.  (this is not so clear...)
> 
> ARCH_THUNDER  -> ARM64 -> ARM_GIC -> IRQ_DOMAIN_HIERARCHY
> 
> 
> 
>>   That said, this looks like a reasonable
>> improvement, and will allow the COMPILE_TEST to enable it, so...
>>
>> Acked-by: David Daney <david.daney@...ium.com>
> 
> 
> BTW, I could not understand your intention of
> (64BIT && COMPILE_TEST)
> 

The driver uses readq()/writeq(), which are not available in some 32BIT 
kernels.  So to ensure that it can build without error we depend on 
64BIT as a proxy for the availability of readq()/writeq()


David