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    SubjectRe: [patch] x64: Avoid irq_chip mask/unmask in fixup_irqs for interrupt-remapping
    On Thu, 2009-06-04 at 16:13 -0700, Eric W. Biederman wrote:
    > Suresh Siddha <> writes:
    > > From: Suresh Siddha <>
    > > Subject: x64: Avoid irq_chip mask/unmask in fixup_irqs for interrupt-remapping
    > >
    > > In the presence of interrupt-remapping, irqs will be migrated in the
    > > process context and we don't do (and there is no need to) irq_chip mask/unmask
    > > while migrating the interrupt.
    > >
    > > Similarly fix the fixup_irqs() that get called during cpu offline and avoid
    > > calling irq_chip mask/unmask for irqs that are ok to be migrated in the
    > > process context.
    > >
    > > While we didn't observe any race condition with the existing code,
    > > this change takes complete advantage of interrupt-remapping in
    > > the newer generation platforms and avoids any potential HW lockup's
    > > (that often worry Eric :)
    > You now apparently fail to migrate the irq threads in tandem with
    > the rest of the irqs.

    Eric, Are you referring to Gary's issues? As far as I understand, they
    don't happen in the presence of interrupt-remapping.

    Can you ack this patch, as this avoid touching IO-APIC and MSI entries
    and does fixup_irqs() in a much more reliable fashion.

    I haven't followed Gary's couple of patches related to non
    interrupt-remapping case. I will go through them and see how I can help


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