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SubjectRe: [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@rustcorp.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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