linux-kernel - Re: [PATCH] PCI/MSI: Provide missing stub for pci_msix_can_alloc

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Date:   Thu, 6 Apr 2023 13:48:19 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Reinette Chatre <reinette.chatre@...el.com>
Cc:     bhelgaas@...gle.com, nathan@...nel.org, ndesaulniers@...gle.com,
        trix@...hat.com, tglx@...utronix.de, darwi@...utronix.de,
        kevin.tian@...el.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Arnd Bergmann <arnd@...db.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Marc Zyngier <maz@...nel.org>, Ira Weiny <ira.weiny@...el.com>,
        Shay Drory <shayd@...dia.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Eli Cohen <elic@...dia.com>, Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [PATCH] PCI/MSI: Provide missing stub for
 pci_msix_can_alloc_dyn()

[+cc folks from Arnd's similar patch]

On Wed, Mar 29, 2023 at 01:13:11PM -0700, Reinette Chatre wrote:
> pci_msix_can_alloc_dyn() is not declared when CONFIG_PCI_MSI
> is disabled.
> 
> There is no existing user of pci_msix_can_alloc_dyn() but
> work is in progress to change this. This work encounters
> the following error when CONFIG_PCI_MSI is disabled:
> 
> drivers/vfio/pci/vfio_pci_intrs.c:427:21: error: implicit declaration \
> 	of function 'pci_msix_can_alloc_dyn' \
> 	[-Werror=implicit-function-declaration]
> 
> Provide definition for pci_msix_can_alloc_dyn() in preparation
> for users that need to compile when CONFIG_PCI_MSI is disabled.
> 
> Fixes: 34026364df8e ("PCI/MSI: Provide post-enable dynamic allocation interfaces for MSI-X")
> Reported-by: kernel test robot <lkp@...el.com>
> Link: https://lore.kernel.org/oe-kbuild-all/202303291000.PWFqGCxH-lkp@intel.com/
> Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>

Applied with Sathy's reviewed-by to for-linus for v6.3, thanks!

I also added the Fixes: line for mlx5 from Arnd's patch.

> ---
> I missed this one in my previous fix. After this all the functions
> in pci.h's #ifdef CONFIG_PCI_MSI portion have stubs when
> CONFIG_PCI_MSI is disabled.
> 
>  include/linux/pci.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index b50e5c79f7e3..a5dda515fcd1 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1624,6 +1624,8 @@ pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
>  					      flags, NULL);
>  }
>  
> +static inline bool pci_msix_can_alloc_dyn(struct pci_dev *dev)
> +{ return false; }
>  static inline struct msi_map pci_msix_alloc_irq_at(struct pci_dev *dev, unsigned int index,
>  						   const struct irq_affinity_desc *affdesc)
>  {
> -- 
> 2.34.1
>