linux-kernel - Re: [PATCH] pci: fix compilation when CONFIG_PCI

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Message-ID: <4C186A87.6040005@jp.fujitsu.com>
Date:	Wed, 16 Jun 2010 15:09:11 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH] pci: fix compilation when CONFIG_PCI_MSI=n

(2010/06/16 13:51), Rusty Russell wrote:
> drivers/pci/pci.c:2277: error: redefinition of ‘pci_msi_off’
> include/linux/pci.h:786: note: previous definition of ‘pci_msi_off’ was here
> 
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> ---
>  drivers/pci/pci.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -2266,6 +2266,7 @@ pci_intx(struct pci_dev *pdev, int enabl
>  	}
>  }
>  
> +#ifdef CONFIG_PCI_MSI
>  /**
>   * pci_msi_off - disables any msi or msix capabilities
>   * @dev: the PCI device to operate on
> @@ -2293,6 +2294,7 @@ void pci_msi_off(struct pci_dev *dev)
>  	}
>  }
>  EXPORT_SYMBOL_GPL(pci_msi_off);
> +#endif
>  
>  #ifndef HAVE_ARCH_PCI_SET_DMA_MAX_SEGMENT_SIZE
>  int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size)

Rusty, thank you for reporting it.
But I think this fix is not correct.

It looks like a bug in Michael's patch:
  [PATCH for-2.6.35] virtio-pci: disable msi at startup

The patch includes a change as following:

> > --- a/include/linux/pci.h
> > +++ b/include/linux/pci.h
> > @@ -780,7 +780,11 @@ int __must_check pci_set_mwi(struct pci_dev *dev);
> >  int pci_try_set_mwi(struct pci_dev *dev);
> >  void pci_clear_mwi(struct pci_dev *dev);
> >  void pci_intx(struct pci_dev *dev, int enable);
> > +#ifdef CONFIG_PCI_MSI
> >  void pci_msi_off(struct pci_dev *dev);
> > +#else
> > +static inline void pci_msi_off(struct pci_dev *dev) {}
> > +#endif
> >  int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size);
> >  int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask);
> >  int pcix_get_max_mmrbc(struct pci_dev *dev);

According to the old commit f5f2b13129a6541debf8851bae843cbbf48298b7,
pci_msi_off() was designed to be available even when msi support is not
compiled in.  So I think this change will make something wrong.

Michael, could you check your patch?


Thanks,
H.Seto

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