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

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Date:   Tue, 20 Oct 2020 08:51:33 -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 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

-- 
~Randy