linux-kernel - Re: [PATCH] PCI: export pci_find_host

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Date:   Tue, 20 Oct 2020 09:04:31 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        linux-mips@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-pci@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Thomas Bogendoerfer <tbogendoerfer@...e.de>
Subject: Re: [PATCH] PCI: export pci_find_host_bridge() to fix MFD build error

On 10/20/20 8:51 AM, Randy Dunlap wrote:
> On 10/20/20 7:06 AM, Randy Dunlap wrote:
>> On 10/20/20 1:02 AM, Christoph Hellwig wrote:
>>> On Sun, Oct 18, 2020 at 11:14:53PM -0700, Randy Dunlap wrote:
>>>> Fix a build error in drivers/mfd/ioc.o by exporting
>>>> pci_find_host_bridge().
>>>>
>>>> ERROR: modpost: "pci_find_host_bridge" [drivers/mfd/ioc3.ko] undefined!
>>>
>>> I think the mfd code should be fixed to not depend on such an internal
>>> symbol instead.
>>>
>>
>> Thanks for commenting. and I am not surprised.
>>
>> Adding Cc: for Thomas and Lee.
> 
> BTW, if someone wants to use the MFD ioc3 driver now,
> without any source code patches, they can just build it in
> (SGI_MFD_IOC3=y) instead of building it as a loadable module.
> 
> It builds successfully and can use pci_find_host_bridge().
> pci_find_host_bridge() just isn't exported for loadable modules.
> 
> So this could be useful (PCI=y):
> 
> config SGI_MFD_IOC3
> 	tristate "SGI IOC3 core driver"
> 	depends on PCI=y && MIPS && 64BIT
> 	select MFD_CORE

Wow. That's not correct at all. Need more coffee.

Just set SGI_MFD_IOC3=y and it will be fine.

-- 
~Randy