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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 <> wrote:
>> Yinghai Lu wrote:
>>> otherwise Xen is _completely_ unusable with 5 or more VCPUs.
>>> based on Alex's patch
>>> also add +1 offset after redir_entries
>>> Signed-off-by: Yinghai Lu <>
>>> Cc: Alex Nixon <>
>> 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.


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