Messages in this thread | | | Date | Fri, 18 May 2007 11:28:25 -0700 | From | "Yinghai Lu" <> | Subject | Re: [patch] x86_64, irq: check remote IRR bit before migrating level triggered irq |
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On 5/18/07, Siddha, Suresh B <suresh.b.siddha@intel.com> wrote: > > If the vector number stays same during irq migration and if we reset remote > IRR bit using the above method(edge and then back to level) during > irq migration, then we have a problem. A new interrupt arriving on a new > cpu will set the remote IRR bit and now the old inflight EOI broadcast > reaches IOAPIC RTE(resetting the remote IRR bit, because the vector in the > broadcast msg is same), while the kernel code still assumes that the remote > IRR bit is still set. This will lead to more problems and issues.
coud add some line __assign_irq_vector. to make sure old_vector!=vector.
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