linux-kernel - Re: [patch V3 28/35] PCI/MSI: Simplify pci_irq_get

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Date:   Mon, 31 Jan 2022 07:21:40 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, Nishanth Menon <nm@...com>,
        Mark Rutland <mark.rutland@....com>,
        Stuart Yoder <stuyoder@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Will Deacon <will@...nel.org>, Ashok Raj <ashok.raj@...el.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Sinan Kaya <okaya@...nel.org>,
        iommu@...ts.linux-foundation.org,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Jason Gunthorpe <jgg@...dia.com>, linux-pci@...r.kernel.org,
        xen-devel@...ts.xenproject.org, Kevin Tian <kevin.tian@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        Robin Murphy <robin.murphy@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Cedric Le Goater <clg@...d.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Megha Dey <megha.dey@...el.com>,
        Juergen Gross <jgross@...e.com>,
        Tero Kristo <kristo@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vinod Koul <vkoul@...nel.org>, Marc Zygnier <maz@...nel.org>,
        dmaengine@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [patch V3 28/35] PCI/MSI: Simplify pci_irq_get_affinity()

On 1/31/22 03:27, Thomas Gleixner wrote:
> On Sun, Jan 30 2022 at 09:12, Guenter Roeck wrote:
>> On Fri, Dec 10, 2021 at 11:19:26PM +0100, Thomas Gleixner wrote:
>> This patch results in the following runtime warning when booting x86
>> (32 bit) nosmp images from NVME in qemu.
>>
>> [   14.825482] nvme nvme0: 1/0/0 default/read/poll queues
>> ILLOPC: ca7c6d10: 0f 0b
>> [   14.826188] ------------[ cut here ]------------
>> [   14.826307] WARNING: CPU: 0 PID: 7 at drivers/pci/msi/msi.c:1114 pci_irq_get_affinity+0x80/0x90
> 
> This complains about msi_desc->affinity being NULL.
> 
>> git bisect bad f48235900182d64537c6e8f8dc0932b57a1a0638
>> # first bad commit: [f48235900182d64537c6e8f8dc0932b57a1a0638] PCI/MSI: Simplify pci_irq_get_affinity()
> 
> Hrm. Can you please provide dmesg and /proc/interrupts from a
> kernel before that commit?
> 

Sure. Please see http://server.roeck-us.net/qemu/x86/.
The logs are generated with with v5.16.4.

Guenter