linux-kernel - RE: [PATCH] PCI: Fix build error when CONFIG_PCI

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Date:   Fri, 10 Feb 2023 05:12:40 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     "Chatre, Reinette" <reinette.chatre@...el.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "nathan@...nel.org" <nathan@...nel.org>,
        "ndesaulniers@...gle.com" <ndesaulniers@...gle.com>,
        "Rix, Tom" <trix@...hat.com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "darwi@...utronix.de" <darwi@...utronix.de>
Subject: RE: [PATCH] PCI: Fix build error when CONFIG_PCI_MSI disabled

> From: Chatre, Reinette <reinette.chatre@...el.com>
> Sent: Friday, February 10, 2023 5:49 AM
> 
> pci_msix_alloc_irq_at() and pci_msix_free_irq() are not
> declared when CONFIG_PCI_MSI is disabled.
> 
> Users of these two calls do not yet exist but when users
> do appear (shown below is an attempt to use the new API
> in vfio-pci) the following errors will be encountered when
> compiling with CONFIG_PCI_MSI disabled:
> drivers/vfio/pci/vfio_pci_intrs.c:461:4: error: implicit declaration of\
>         function 'pci_msix_free_irq' is invalid in C99\
>         [-Werror,-Wimplicit-function-declaration]
>                            pci_msix_free_irq(pdev, msix_map);
>                            ^
>    drivers/vfio/pci/vfio_pci_intrs.c:461:4: note: did you mean
> 'pci_ims_free_irq'?
>    include/linux/pci.h:2516:6: note: 'pci_ims_free_irq' declared here
>    void pci_ims_free_irq(struct pci_dev *pdev, struct msi_map map);
>         ^
> drivers/vfio/pci/vfio_pci_intrs.c:511:15: error: implicit declaration of\
>         function 'pci_msix_alloc_irq_at' is invalid in C99\
>         [-Werror,-Wimplicit-function-declaration]
>                    msix_map = pci_msix_alloc_irq_at(pdev, vector, NULL);
>                                       ^
>    drivers/vfio/pci/vfio_pci_intrs.c:511:15: note: did you mean
> 'pci_ims_alloc_irq'?
>    include/linux/pci.h:2514:16: note: 'pci_ims_alloc_irq' declared here
>    struct msi_map pci_ims_alloc_irq(struct pci_dev *pdev,\
>                                     union msi_instance_cookie *icookie,
> 
> Provide definitions for pci_msix_alloc_irq_at() and pci_msix_free_irq() in
> preparation for users that need to compile when CONFIG_PCI_MSI is
> disabled.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>