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    SubjectRe: RCU lockup in the SMP idle thread, help...
    On Thu, 20 Sep 2012, Linus Walleij wrote:

    > On Thu, Sep 20, 2012 at 2:03 AM, Paul E. McKenney
    > <paulmck@linux.vnet.ibm.com> wrote:
    >
    > > Any thoughts on the feasibility of implementing NMI-based stack backtraces
    > > for ARM?
    >
    > Nico's department, so let's page him.

    That _could_ be done, at least in theory, with some restrictions.

    However in practice ...

    > In IIRC ux500 all NMIs are reserved for the secure world, so it's
    > basically a no can do. :-(

    That's the main issue here: not all platforms allow FIQs ( a FIQ is the
    closest to a NMI on ARM) to be available to the operating system.

    However, for where this is possible, there is a patch series from Anton
    Vorontsov implementing FIQ based KGDB support which might be useful
    here.


    Nicolas


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