linux-kernel - Re: [Patch v3 01/11] arch/powerpc/pci: Fix compiling error for mpc85xx

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Date:	Fri, 5 Aug 2016 04:26:26 +0000
From:	york sun <york.sun@....com>
To:	Michael Ellerman <mpe@...erman.id.au>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>
CC:	"morbidrsa@...il.com" <morbidrsa@...il.com>,
	"oss@...error.net" <oss@...error.net>,
	Stuart Yoder <stuart.yoder@....com>,
	"bp@...en8.de" <bp@...en8.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Paul Mackerras" <paulus@...ba.org>,
	Kevin Hao <haokexin@...il.com>,
	"Andrew Donnellan" <andrew.donnellan@....ibm.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Patch v3 01/11] arch/powerpc/pci: Fix compiling error for
 mpc85xx_edac

On 08/04/2016 08:43 PM, Michael Ellerman wrote:
> York Sun <york.sun@....com> writes:
>
>> Two symbols are missing if mpc85xx_edac driver is compiled as module.
>>
>> Signed-off-by: York Sun <york.sun@....com>
>>
>> ---
>> Change log
>>   v3: Change subject tag
>>   v2: no change
>>
>>  arch/powerpc/kernel/pci-common.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
>> index 0f7a60f..86bc484 100644
>> --- a/arch/powerpc/kernel/pci-common.c
>> +++ b/arch/powerpc/kernel/pci-common.c
>> @@ -226,6 +226,7 @@ struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
>>  	}
>>  	return NULL;
>>  }
>> +EXPORT_SYMBOL(pci_find_hose_for_OF_device);
>>
>>  /*
>>   * Reads the interrupt pin to determine if interrupt is use by card.
>> @@ -1585,6 +1586,7 @@ int early_find_capability(struct pci_controller *hose, int bus, int devfn,
>>  {
>>  	return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
>>  }
>> +EXPORT_SYMBOL(early_find_capability);
>
> Does the driver really need to use these routines? They're meant for use
> early in boot, before PCI is setup.
>
> AFAICS this is just a regular driver, so when it's probed the PCI
> devices should have already been scanned. In which case pci_get_device()
> could work couldn't it? (I see other edac drivers doing that).
>

I don't have deep knowledge of this driver. What I am trying is to 
separate the common DDR part and share it with ARM platforms. Along the 
way, I found the compiling error if build a module. If exposing these 
functions becomes a concern, I can live without it.

York