linux-kernel - Re: [PATCH V2 7/8] vfio/pci: Support dynamic MSI-x

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Date:   Wed, 29 Mar 2023 07:42:07 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     kernel test robot <lkp@...el.com>, <jgg@...dia.com>,
        <yishaih@...dia.com>, <shameerali.kolothum.thodi@...wei.com>,
        <kevin.tian@...el.com>, <alex.williamson@...hat.com>
CC:     <oe-kbuild-all@...ts.linux.dev>, <tglx@...utronix.de>,
        <darwi@...utronix.de>, <kvm@...r.kernel.org>,
        <dave.jiang@...el.com>, <jing2.liu@...el.com>,
        <ashok.raj@...el.com>, <fenghua.yu@...el.com>,
        <tom.zanussi@...ux.intel.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 7/8] vfio/pci: Support dynamic MSI-x



Thank you very much for the report.

On 3/28/2023 7:48 PM, kernel test robot wrote:
> config: i386-randconfig-a001-20230327 (https://download.01.org/0day-ci/archive/20230329/202303291000.PWFqGCxH-lkp@intel.com/config)

This config (and all the other configs in the reports about
implicit declaration of function 'pci_msix_can_alloc_dyn')
has:
# CONFIG_PCI_MSI is not set

Resulting in:
 
>    drivers/vfio/pci/vfio_pci_intrs.c: In function 'vfio_msi_set_vector_signal':
>>> drivers/vfio/pci/vfio_pci_intrs.c:427:21: error: implicit declaration of function 'pci_msix_can_alloc_dyn' [-Werror=implicit-function-declaration]
>      427 |         if (msix && pci_msix_can_alloc_dyn(vdev->pdev))
>          |                     ^~~~~~~~~~~~~~~~~~~~~~
>    cc1: some warnings being treated as errors
> 


because include/linux/pci.h is missing a stub for
pci_msix_can_alloc_dyn() when CONFIG_PCI_MSI is not set.
I'll send a separate fix for that.

Reinette