Re: [PATCH] vfio: Fix build failure seen if vfio is built as module and EEH is enabled

[Guenter Roeck]

On 08/09/2014 12:28 PM, Alex Williamson wrote:
> On Sat, 2014-08-09 at 10:04 -0700, Guenter Roeck wrote:
> > The following build failure is seen with ppc:allmodconfig.
> >
> > ERROR: ".vfio_spapr_iommu_eeh_ioctl" [drivers/vfio/vfio_iommu_spapr_tce.ko] undefined!
> > ERROR: ".vfio_spapr_pci_eeh_open" [drivers/vfio/pci/vfio-pci.ko] undefined!
> > ERROR: ".vfio_spapr_pci_eeh_release" [drivers/vfio/pci/vfio-pci.ko] undefined!
> >
> > Simply exporting the missing symbols is insufficient, since drivers/vfio
> > can be built as module but drivers/vfio/vfio_spapr_eeh.c depends on
> > EEH which is boolean. The combination of obj-m for drivers/vfio and obj-y
> > for drivers/vfio/vfio_spapr_eeh.o results in the symbols being missed even
> > if exported.
> >
> > Export missing symbols and introduce new tristate configuration option
> > VFIO_EEH depending on both EEH and VFIO to fix the problem.
> >
> > Cc: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
> > Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
>
> Please try:
>
> git://github.com/awilliam/linux-vfio.git next
>
> This will be part of the next linux-next build, should resolve the
> problem, and I plan to ask for a pull early this coming week.  Thanks,

That should do for the most part, but it will select VFIO_SPAPR_EEH
even if EEH is not configured. You would need something like
	select VFIO_SPAPR_EEH if (PPC_POWERNV || PPC_PSERIES) && EEH
to prevent that.

Guenter

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