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    SubjectRe: [PATCH 3.17-rc4 v7 0/6] arm: Implement arch_trigger_all_cpu_backtrace
    From
    Hi,

    Thanks a lot for working on this!

    On Wed, Sep 17, 2014 at 10:10 AM, Daniel Thompson
    <daniel.thompson@linaro.org> wrote:
    > Changes *before* v1:
    >
    > * This patchset is a hugely cut-down successor to "[PATCH v11 00/19]
    > arm: KGDB NMI/FIQ support". Thanks to Thomas Gleixner for suggesting
    > the new structure. For historic details see:
    > https://lkml.org/lkml/2014/9/2/227

    What's the right way to extend your work in order to get a NMI-like
    watchdog hard lockup detector similar to the one on x86?

    I'm testing your patches on Exynos4412 and I guess in their current
    state they don't go quite this deep, as the only callers of
    trigger_all_cpu_backtrace() are sysrq, hung_task and spinlock debug
    code - none of which seem as fail-safe as a trigger like a
    pre-programmed watchdog NMI interrupt would be.

    Do I need to find a way to get CONFIG_FIQ available on this platform
    first? and/or CONFIG_HARDLOCKUP_DETECTOR?

    Thanks
    Daniel


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