Re: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain

From	Christoph Hellwig <hch@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain
Date	2017-04-25 15:20 +0200
Message-ID	<tA8xP-5bb-3@gated-at.bofh.it> (permalink)
References	<tynhE-2OS-19@gated-at.bofh.it> <typ9L-3Yq-9@gated-at.bofh.it> <typ9L-3Yq-7@gated-at.bofh.it> <tzVhf-4Us-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi John,

please fix your quoting of the previous mails, thanks!


What ACPI defines does not matter at all.  Linux uses 32-bit domains
IDs, and on x86 specifily uses those for non-ACPI enumarated domains
(e.g. VMD).

You've also not demontrated any issue with any Linux driver yet.

> Also...it would be nice if we could use Haiyang's patch as at least a
> temporary fix, because distros are just today releasing the previous code,
> and HyperV will start breaking "occasionally", depending on whether the
> 32-bit virtual (fake) PCI domain fits within 16 bits. (If not, then we can
> rush out a driver update to fix it, but there will be a window of time with
> some breakage there.)

Just send the fix to whatever driver is broken to the driver maintainer.
But I can't find a single broken driver in the tree, and as you know
nothing else matters for Linux anyway.

Thread

[PATCH] pci-hyperv: Use only 16 bit integer for PCI domain Haiyang Zhang <haiyangz@exchange.microsoft.com> - 2017-04-20 18:40 +0200
  RE: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain Haiyang Zhang <haiyangz@microsoft.com> - 2017-04-20 20:40 +0200
    Re: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain Christoph Hellwig <hch@infradead.org> - 2017-04-20 21:20 +0200
    Re: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain John Hubbard <jhubbard@nvidia.com> - 2017-04-25 01:10 +0200
      Re: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain Dan Carpenter <dan.carpenter@oracle.com> - 2017-04-25 15:10 +0200
      Re: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain Christoph Hellwig <hch@infradead.org> - 2017-04-25 15:20 +0200
        Re: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain John Hubbard <jhubbard@nvidia.com> - 2017-04-25 20:20 +0200
  Re: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain Bjorn Helgaas <bhelgaas@google.com> - 2017-04-20 20:40 +0200

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