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    SubjectRe: Latest tip kernel(3.2-rc1-tip_cf6b3899) fails to boot on x3850x5 machine
    Date
    On Thu, 15 Dec 2011 12:25:06 -0800, Suresh Siddha <suresh.b.siddha@intel.com> wrote:
    > On Thu, 2011-12-15 at 11:16 -0800, Yinghai Lu wrote:
    > > On Wed, Dec 14, 2011 at 11:19 PM, Ingo Molnar <mingo@elte.hu> wrote:
    > > >
    > > > * Yinghai Lu <yinghai@kernel.org> wrote:
    > > >
    > > >> On Wed, Dec 14, 2011 at 6:24 PM, Nikunj A Dadhania
    > > >> <nikunj@linux.vnet.ibm.com> wrote:
    > > >> >>
    > > >> >> BIOS pre-enabled x2apic, and kernel config does not have x2apic enabled?
    > > >> > make oldconfig somehow skipped this!! I can see my previous kernel config
    > > >> > having this enabled.
    > > >>
    > > >> looks like recent dmar table related DMAR changing cause that.
    > > >
    > > > Which one would that be? Perhaps:
    > > >
    > > > iommu: Rename the DMAR and INTR_REMAP config options
    > > >
    > > > ? They then need to be fixed if it can be done sanely.
    > >
    > > yes.
    >
    > Not quite sure if I understand the reported issue.
    >
    > If the old config file had CONFIG_X86_X2APIC and CONFIG_INTR_REMAP set,
    > doing "make oldconfig" on the newer kernel is asking if I want the new
    > CONFIG_IRQ_REMAP option to be set and if I say yes, then I have both
    > CONFIG_X86_X2APIC and CONFIG_IRQ_REMAP set and all is well.
    >
    > But if I say no, then as expected CONFIG_X86_X2APIC gets disabled (as
    > IRQ_REMAP is not selected).
    Yes, my bad, I was expecting this in processor type and features, but
    that is now in IOMMU.

    Thanks,
    Nikunj



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