Messages in this thread | | | Date | Thu, 8 Jun 2006 16:02:31 +0200 (CEST) | From | Roman Zippel <> | Subject | Re: mutex vs. local irqs (Was: 2.6.18 -mm merge plans) |
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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.
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