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    SubjectRe: [PATCH v5 0/6] x86/apic: Fix restoring boot irq mode in reboot and kexec/kdump
    Hi Ingo, Eric,

    On 02/16/18 at 10:38am, Ingo Molnar wrote:
    >
    > * Baoquan He <bhe@redhat.com> wrote:
    >
    > > This is v5 post. Newly added patch 0002 includes the change
    > > related to KEXEC_JUMP path. Patch 0003 only includes the
    > > regression fix.
    > >
    > > A regression bug was introduced in below commit.
    > > commit 522e66464467 ("x86/apic: Disable I/O APIC before shutdown of the local APIC")
    > >
    > > It caused the action to fail that we try to restore boot irq mode
    > > in reboot and kexec/kdump. Details can be seen in patch 0003.
    > >
    > > Warning can always be seen during kdump kernel boot on qemu/kvm
    > > platform. Our customer even saw casual kdump kernel hang once in
    > > ~30 attempts during stress testing of kdump on KVM machine.
    > >
    > > v4->v5:
    > > Take out the change related to KEXEC_JUMP to a new patch 0002
    > > according to Eric's suggestion.
    > > Patch 0003 in this series only includes the regression fix.
    > >
    > > v3->v4:
    > > Eric pointed out that in patch 0002 the change related to
    > > KEXEC_JUMP is not right.
    > > Correct it.
    > >
    > > Add Fixes tag and Cc to stable.
    >
    > Eric, are these patches looking good to you now?

    Thanks for checking this!

    I got warning message from kbuild test robot on previous v3 and v4. I
    guess this v5 post also has the issue since the code is the same, just
    patch format is changed.

    Will report status after investigation.

    Thanks
    Baoquan

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