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

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Message-ID: <20170726133715.7cb039cb@w520.home>
Date:   Wed, 26 Jul 2017 13:37:15 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Murilo Opsfelder Araujo <mopsfelder@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2] include/linux/vfio.h: Guard powerpc-specific
 functions with CONFIG_VFIO_SPAPR_EEH

On Tue, 18 Jul 2017 14:22:20 -0300
Murilo Opsfelder Araujo <mopsfelder@...il.com> 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>
> ---

Applied to my for-linus branch with David and Alexey's R-b for v4.13.
Thanks,

Alex

> 
> Changes from v1:
> - Rebased on top of next-20170718.
> 
>  include/linux/vfio.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/vfio.h b/include/linux/vfio.h
> index 586809a..a47b985 100644
> --- a/include/linux/vfio.h
> +++ b/include/linux/vfio.h
> @@ -152,7 +152,7 @@ extern int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr,
>  					      size_t *data_size);
> 
>  struct pci_dev;
> -#ifdef CONFIG_EEH
> +#if IS_ENABLED(CONFIG_VFIO_SPAPR_EEH)
>  extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
>  extern void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
>  extern long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
> @@ -173,7 +173,7 @@ static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
>  {
>  	return -ENOTTY;
>  }
> -#endif /* CONFIG_EEH */
> +#endif /* CONFIG_VFIO_SPAPR_EEH */
> 
>  /*
>   * IRQfd - generic
> --
> 2.9.4