linux-kernel - Re: [PATCH] PCI/MSI: stub pci_write_msi_msg when CONFIG_PCI

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Message-ID: <20160217141932.283ced46@t450s.home>
Date:	Wed, 17 Feb 2016 14:19:32 -0700
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Luis Henriques <luis.henriques@...onical.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] PCI/MSI: stub pci_write_msi_msg when CONFIG_PCI_MSI is
 disabled

[cc +bjorn, +linux-pci]

On Wed, 17 Feb 2016 21:05:38 +0000
Luis Henriques <luis.henriques@...onical.com> wrote:

> Stubbing function pci_write_msi_msg when CONFIG_PCI_MSI is disabled fixes
> a link failure in vfio:
> 
> drivers/built-in.o: In function `vfio_msi_set_vector_signal':
> :(.text+0x626640): undefined reference to `pci_write_msi_msg'
> 
> Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
> ---
>  include/linux/msi.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/msi.h b/include/linux/msi.h
> index a2a0068a8387..09dc375d11d8 100644
> --- a/include/linux/msi.h
> +++ b/include/linux/msi.h
> @@ -105,18 +105,19 @@ struct msi_desc {
>  
>  struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
>  void *msi_desc_to_pci_sysdata(struct msi_desc *desc);
> +void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
>  #else /* CONFIG_PCI_MSI */
>  static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
>  {
>  	return NULL;
>  }
> +static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg) { }
>  #endif /* CONFIG_PCI_MSI */
>  
>  struct msi_desc *alloc_msi_entry(struct device *dev);
>  void free_msi_entry(struct msi_desc *entry);
>  void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
>  void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
> -void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
>  
>  u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag);
>  u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);