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    SubjectRe: [PATCH] x86: fix probe_nr_irqs for xen
    Yinghai Lu wrote:
    > On Thu, Aug 21, 2008 at 4:33 PM, Jeremy Fitzhardinge <jeremy@goop.org> wrote:
    >
    >> Yinghai Lu wrote:
    >>
    >>> otherwise Xen is _completely_ unusable with 5 or more VCPUs.
    >>> ( when !CONFIG_HAVE_SPARSE_IRQ)
    >>>
    >>> based on Alex's patch
    >>>
    >>> also add +1 offset after redir_entries
    >>>
    >>> Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
    >>> Cc: Alex Nixon <alex.nixon@citrix.com>
    >>>
    >>>
    >> Looks good to me. We can fix this in a better way later.
    >>
    >
    > later could set CONFIG_HAVE_SPARSE_IRQ to true by default.
    >

    Well, perhaps. But we can use vectors rather than IRQs for Xen event
    channel mappings, which will save us from having to allocate lots of
    per-cpu irqs.

    Also, implementing probe_nr_irqs() in a more generic (rather than
    io_apic-specific) way. Using some interface that queries each irq chip
    for how many irqs it supports, or something.

    J


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