linux-kernel - Re: [PATCH] PCI: hv: use effective affinity mask

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Message-ID: <20171108030133.GB28427@bhelgaas-glaptop.roam.corp.google.com>
Date:   Tue, 7 Nov 2017 21:01:33 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Jake Oshins <jakeo@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Jork Loeser <Jork.Loeser@...rosoft.com>,
        "Chris Valean (Cloudbase Solutions SRL)" <v-chvale@...rosoft.com>,
        "Adrian Suhov (Cloudbase Solutions SRL)" <v-adsuho@...rosoft.com>,
        Simon Xiao <sixiao@...rosoft.com>,
        'Eyal Mizrachi' <eyalmi@...lanox.com>,
        Jack Morgenstein <jackm@...lanox.com>,
        Armen Guezalian <armeng@...lanox.com>,
        Firas Mahameed <firas@...lanox.com>,
        Tziporet Koren <tziporet@...lanox.com>,
        Daniel Jurgens <danielj@...lanox.com>
Subject: Re: [PATCH] PCI: hv: use effective affinity mask

On Wed, Nov 08, 2017 at 01:27:02AM +0000, Dexuan Cui wrote:
> > From: Bjorn Helgaas [mailto:helgaas@...nel.org]
> > Sent: Tuesday, November 7, 2017 5:08 PM
> > On Wed, Nov 01, 2017 at 08:30:53PM +0000, Dexuan Cui wrote:
> > >
> > > Please consider this for v4.14, if it's not too late.
> > 
> > What would be the rationale for putting it in v4.14?  After the merge
> > window, I usually only merge fixes for problems introduced during the
> > merge window, or for serious regressions.  I can't tell if this fits
> > into that or not.
> 
> The patch was sent last Wednesday and I hoped it could catch the 
> merge window to be in v4.14 so we won't have to request a backport
> for the v4.14 stable kernel in future. And I was not exactly sure when
> the merge window was. Sorry :-)
> 
> The patch is not fixing a serious regression. It just fixes a long standing
> issue from the beginning of the Hyper-V vPCI driver: 1 of 7 Mellanox 
> VFs of a 32-vCPU VM running on Hyper-V may not receive interrupts.

No problem.  I added a stable tag so the backport should happen
automatically and put it on my pci/host-hv branch for v4.15, with Jake's
Reviewed-by.  Thanks!

Bjorn