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x86: fix probe_nr_irqs for xen

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otherwise Xen is _completely_ unusable with 5 or more VCPUs.
(when !CONFIG_HAVE_SPARSE_IRQ).

based on Alex Nixon's patch.

also add +1 offset after redir_entries

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Alex Nixon <alex.nixon@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-08-21 13:10:09 -07:00 committed by Ingo Molnar
parent a2d332fa34
commit 052c0bff9b
1 changed files with 8 additions and 3 deletions
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11
arch/x86/kernel/io_apic.c
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@ -3625,16 +3625,21 @@ int __init probe_nr_irqs(void)
{
int idx;
int nr = 0;
#ifndef CONFIG_XEN
int nr_min = 32;
#else
int nr_min = NR_IRQS;
#endif
for (idx = 0; idx < nr_ioapics; idx++)
nr += io_apic_get_redir_entries(idx);
nr += io_apic_get_redir_entries(idx) + 1;
/* double it for hotplug and msi and nmi */
nr <<= 1;
/* something wrong ? */
if (nr < 32)
nr = 32;
if (nr < nr_min)
nr = nr_min;
return nr;
}