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    SubjectRe: [PATCH 0/5] Generic smp_call_function(), improvements, and smp_call_function_single()
    On Fri, Mar 21 2008, Luck, Tony wrote:
    > > When/if more archs are converted, it'll of course look even better.
    > > Comments? I've verified that this builts and boots on x86, x86-64
    > > and powerpc. IA64 may still need a one-liner change, I don't have
    > > access to that platform anymore so I can't verify that myself. It
    > > does build, however :-)
    > Can you give me a clue as to which line needs the one-liner ... although
    > it builds cleanly for IA64 it panics with a dereference NULL fault. It

    My thinking was that it may need a bit of help to ensure that the init
    function for single call data works,
    kernel/smp.c:init_call_single_data() specifically. It may be run before
    the arch code has setup all CPU related structures, not sure...

    > looks like we were in the list_add_tail(&data->list, &dst->list) code.

    Is it data or dst being NULL? Looking at your trace, it must be dst.
    Which makes me believe that it is indeed a missing call of the above
    function at the right time. So some help would be accepted there :)

    Jens Axboe

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