linux-kernel - Re: [PATCH v2] include/linux/vfio.h: Guard powerpc-specific functions with CONFIG_VFIO_SPAPR

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Date:   Tue, 25 Jul 2017 09:44:39 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Murilo Opsfelder Araújo <mopsfelder@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, <aik@...abs.ru>,
        David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH v2] include/linux/vfio.h: Guard powerpc-specific
 functions with CONFIG_VFIO_SPAPR_EEH

[cc +Alexey, David]

Any comments from the usual suspects for vfio/spapr?  Thanks,

Alex

On Tue, 25 Jul 2017 10:56:38 -0300
Murilo Opsfelder Araújo <mopsfelder@...il.com> wrote:

> On 07/18/2017 02:22 PM, Murilo Opsfelder Araujo wrote:
> > When CONFIG_EEH=y and CONFIG_VFIO_SPAPR_EEH=n, build fails with the
> > following:
> > 
> >     drivers/vfio/pci/vfio_pci.o: In function `.vfio_pci_release':
> >     vfio_pci.c:(.text+0xa98): undefined reference to `.vfio_spapr_pci_eeh_release'
> >     drivers/vfio/pci/vfio_pci.o: In function `.vfio_pci_open':
> >     vfio_pci.c:(.text+0x1420): undefined reference to `.vfio_spapr_pci_eeh_open'
> > 
> > In this case, vfio_pci.c should use the empty definitions of
> > vfio_spapr_pci_eeh_open and vfio_spapr_pci_eeh_release functions.
> > 
> > This patch fixes it by guarding these function definitions with
> > CONFIG_VFIO_SPAPR_EEH, the symbol that controls whether vfio_spapr_eeh.c is
> > built, which is where the non-empty versions of these functions are. We need to
> > make use of IS_ENABLED() macro because CONFIG_VFIO_SPAPR_EEH is a tristate
> > option.
> > 
> > This issue was found during a randconfig build. Logs are here:
> > 
> >     http://kisskb.ellerman.id.au/kisskb/buildresult/12982362/
> > 
> > Signed-off-by: Murilo Opsfelder Araujo <mopsfelder@...il.com>
> > ---
> > 
> > Changes from v1:
> > - Rebased on top of next-20170718.  
> 
> Hi, Alex.
> 
> Are you applying this?
> 
> Thanks!
>