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SubjectMultiple MSI, take 3

I'd like to thank Michael Ellerman for his feedback. This is a much
better patchset than it used to be.

Changes since the previous patchset:
- Dumped the variable renaming as it made the patchset harder to read.
- Moved the addition of the 'multiple' field from the first patch to the
- Changed the calling convention of arch_teardown_msi_irqs back to
- Fix the docbook for pci_enable_msi_block
- Limit powerpc's MSI allocation to 1 in arch_msi_check_device, not
- Rewrote AHCI interrupt claiming code to handle failures better and to
claim fewer interrupts if possible.

Outstanding things I'd like reviewed:
- The x86-64 patch has received no comments so far.
- The AHCI patch needs to be re-reviewed. Sorry, Jeff. It's a bit
more complex than I'd like, but I don't see a clearer way to write
it, given the nasty behaviour that the AHCI spec permits.
- I've just added the MSI-HOWTO patch to this set. New reviewers are

Patchset available as a git tree from:

git:// multiple-msi
(multiple-msi-20080710 is this patch set in particular)

Patches will be sent in reply to this message.

Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."

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