linux-kernel - Re: [PATCH v8 00/11] Fix BUG_ON in vfio_iommu_group

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Message-ID: <20220408155922.GA317094@bhelgaas>
Date:   Fri, 8 Apr 2022 10:59:22 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Jason Gunthorpe <jgg@...dia.com>,
        Stuart Yoder <stuyoder@...il.com>, rafael@...nel.org,
        David Airlie <airlied@...ux.ie>, linux-pci@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        Diana Craciun <diana.craciun@....nxp.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Will Deacon <will@...nel.org>, Ashok Raj <ashok.raj@...el.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        kvm@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Cornelia Huck <cohuck@...hat.com>,
        linux-kernel@...r.kernel.org, Li Yang <leoyang.li@....com>,
        iommu@...ts.linux-foundation.org,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v8 00/11] Fix BUG_ON in vfio_iommu_group_notifier()

On Fri, Apr 08, 2022 at 05:37:16PM +0200, Joerg Roedel wrote:
> On Fri, Apr 08, 2022 at 11:17:47AM -0300, Jason Gunthorpe wrote:
> > You might consider using a linear tree instead of the topic branches,
> > topics are tricky and I'm not sure it helps a small subsystem so much.
> > Conflicts between topics are a PITA for everyone, and it makes
> > handling conflicts with rc much harder than it needs to be.
> 
> I like the concept of a branch per driver, because with that I can just
> exclude that branch from my next-merge when there are issues with it.
> Conflicts between branches happen too, but they are quite manageable
> when the branches have the same base.

FWIW, I use the same topic branch approach for PCI.  I like the
ability to squash in fixes or drop things without having to clutter
the history with trivial commits and reverts.  I haven't found
conflicts to be a problem.

Bjorn