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    SubjectRe: [RFC 0/5] percpu: Optimize percpu accesses
    Ingo Molnar wrote:
    > * Ingo Molnar <mingo@elte.hu> wrote:
    >
    >>> This patchset provides the following:
    >>>
    >>> * Cleanup: Fix early references to cpumask_of_cpu(0)
    >>> * Generic: Percpu infrastructure to rebase the per cpu area to zero
    >>> * x86_64: Fold pda into per cpu area
    >>> * x86_64: Rebase per cpu variables to zero
    >> thanks Mike - i've started testing it in -tip. One small merge fallout
    >> fix is below. (it's for the new generic-ipi topic that was not in
    >> tip/master yet when you merged percpu-zerobased to it)
    >
    > ok, -tip testing found an early boot crash caused by your patchset, on
    > 64-bit x86:
    >
    > [ 0.396000] calling net_ns_init+0x0/0x143
    > [ 0.400000] net_namespace: 944 bytes
    > [ 0.403578] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
    > [ 0.404000] IP: [<ffffffff80e05b0e>] net_ns_init+0x9f/0x143
    > [ 0.404000] PGD 0
    > [ 0.404000] Oops: 0000 [1] SMP
    > [ 0.404000] CPU 0
    > [...]
    >
    > full bootlog and config can be found at:
    >
    > http://redhat.com/~mingo/misc/crashlog-Tue_Jul__1_16_48_45_CEST_2008.bad
    > http://redhat.com/~mingo/misc/config-Tue_Jul__1_16_48_45_CEST_2008.bad
    >
    > (another 64-bit testbox crashed as well, so this should be readily
    > reproducible.)
    >
    > i've pushed this tree out to tip/tmp.core/percpu-zerobased.Jul__1_16_48
    > topic branch, that is the 2.6.26-rc8-tip-00250-g90874b0 kernel you can
    > see in the crashlog.
    >
    > Ingo

    Wow, that was quick!

    At least this one gets to someplace debuggable. Some others that don't
    even get to the first "kernel alive" messages are really annoying. ;-)

    Thanks,
    Mike


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