linux-kernel - Re: [PATCH v2] PCI/MSI: Avoid torn updates to MSI pairs

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Message-ID: <877e1a2d11.fsf@nanos.tec.linutronix.de>
Date:   Wed, 29 Jan 2020 22:00:58 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Evan Green <evgreen@...omium.org>
Cc:     Rajat Jain <rajatja@...gle.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        x86@...nel.org, Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH v2] PCI/MSI: Avoid torn updates to MSI pairs

Evan,

Evan Green <evgreen@...omium.org> writes:
> On Tue, Jan 28, 2020 at 2:48 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>>
>> Bah. I'm sure I looked at that call chain, noticed the double vector
>> lock and then forgot. Delta patch below.
>
> It's working well with the delta patch, been running for about an hour
> with no issues.

thanks for the info and for testing!

Could you please add some instrumentation to see how often this stuff
actually triggers spurious interrupts?

Thanks,

        tglx