PATCH/RFC: [kdump] fix APIC shutdown sequence
martin.wilck at fujitsu-siemens.com
Wed Aug 8 14:22:54 EDT 2007
Eric W. Biederman wrote:
>> I think a lot would be gained if disable_IO_APIC() would just mask the IRQs
>> (like the function in my patch does), and perhaps fix the dest ID, instead of
>> totally clearing the registers.
> Even masked we still won't see the EOI, because then we are in i8259
> mode. So masked versus totally cleared really should make no
You are talking about EOI sent in the kdump kernel, correct? With my patch
the EOI (sent in the "old" kernel) is seen.
> I guess right now I can see work put into cleaning things up a little
> or not having to call disable_IO_APIC() at all. that was supposed
> to be a short term hack, until we fixed things properly.
> So far no one has been brave enough to mess with the kernel apic
> initialization order so we can remove disable_IO_APIC. If our
> goal isn't to fix things properly by removing the need for
> disable_IO_APIC I don't feel like putting much effort into this
> code path.
Who is working on this? Can you give a reference to a list of things that
would need to be done to do this right?
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