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    SubjectRe: [PATCH 2/2] x86_64: Cleanup non-smp usage of cpu maps v3
    On Mon, 3 Mar 2008 17:02:35 -0800
    Andrew Morton <akpm@linux-foundation.org> wrote:

    > I was unable to bisect it more finely than this:
    >
    > init-move-setup-of-nr_cpu_ids-to-as-early-as-possible-v3.patch
    > generic-percpu-infrastructure-to-rebase-the-per-cpu-area-to-zero-v3.patch OK
    > x86_64-fold-pda-into-per-cpu-area-v3.patch
    > x86_64-fold-pda-into-per-cpu-area-v3-fix.patch
    > x86_64-cleanup-non-smp-usage-of-cpu-maps-v3.patch BAD
    >
    > because when x86_64-cleanup-non-smp-usage-of-cpu-maps-v3.patch was removed
    > the machine hung quite early, when playing around with TSC calibration I
    > think.

    This just happened again with the patches dropped, so it is a separate bug -
    just another regression.


    I now recall that it has been happening on every fifth-odd boot for a few
    weeks now. The machine prints

    Time: tsc clocksource has been installed

    then five instances of "system 00:01: iomem range 0x...", then it hangs.
    ie: it never prints "system 00:01: iomem range 0xfe600000-0xfe6fffff has
    been reserved" from http://userweb.kernel.org/~akpm/dmesg-akpm2.txt.

    It may have some correlation with whether the machine was booted via
    poweron versus `reboot -f', dunno.



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