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

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Date:	Fri, 05 Aug 2016 13:43:32 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	York Sun <york.sun@....com>, linux-edac@...r.kernel.org
Cc:	morbidrsa@...il.com, oss@...error.net, stuart.yoder@....com,
	bp@...en8.de, York Sun <york.sun@....com>,
	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, linux-kernel@...r.kernel.org
Subject: Re: [Patch v3 01/11] arch/powerpc/pci: Fix compiling error for mpc85xx_edac

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).

cheers