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    SubjectRe: mutex vs. local irqs (Was: 2.6.18 -mm merge plans)
    Hi,

    On Thu, 8 Jun 2006, Benjamin Herrenschmidt wrote:

    > > On ppc it should not be that difficult to even modify the exception entry
    > > code. Instead of calling do_IRQ use do_early_IRQ and only install the real
    > > handler later.
    >
    > Yes, it's possible, but will add overhead to the common IRQ path just
    > to handle an early boot special case.

    What I mean is to directly patch the exception entry code, so after the
    initialization is complete you'll have no additional overhead.
    In the EXC_XFER_TEMPLATE() macro the handler is stored at i##n. You can
    either export that address or you can use a special transfer handler,
    which automatically patches the values once some flag is set.

    bye, Roman
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