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    SubjectRe: [PATCH] irq: move some interrupt arch_* functions into struct irq_chip.
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    On Wed, Mar 10, 2010 at 2:55 AM,  <ijc@hellion.org.uk> wrote:
    > From: Ian Campbell <ian.campbell@citrix.com>
    >
    > Move arch_init_copy_chip_data and arch_free_chip_data into function
    > pointers in struct irq_chip since they operate on irq_desc->chip_data.
    >
    > arch_init_chip_data cannot be moved into struct irq_chip at this time
    > because irq_desc->chip is not known at the time the irq_desc is
    > setup. For now rename arch_init_chip_data to arch_init_irq_desc (for
    > PowerPC, the only other user, whose usage better matches the new name)
    > and on x86 convert arch_init_chip_data to ioapic_init_chip_data and
    > call this whenever the IO APIC code allocates a new IRQ.
    >
    > I've retained the chip_data behaviour for uv_irq although it isn't
    > clear to me if these interrupt types support migration or how closely
    > related to the APIC modes they really are. If it weren't for this the
    > ioapic_{init,copy,free}_chip_data functions could be static to
    > io_apic.c.
    >
    > I've tested by booting on a 64 bit system, but it's not clear to me
    > what actions I need to take to actually exercise some of these code
    > paths.
    >

    can you just add another pointer field in irq_desc?

    some kind of *irq_info etc.

    YH


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