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    Subject[PATCH] x86: fix probe_nr_irqs for xen
    Date
    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>

    Index: linux-2.6/arch/x86/kernel/io_apic.c
    ===================================================================
    --- linux-2.6.orig/arch/x86/kernel/io_apic.c
    +++ linux-2.6/arch/x86/kernel/io_apic.c
    @@ -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;
    }

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