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    SubjectRe: 2.6.7-mm6
    On Tue, 6 Jul 2004 16:36:18 -0700
    William Lee Irwin III <> wrote:

    > I have it isolated down to the sched-clean-init-idle.patch and
    > sched-clean-fork.patch. sched-clean-init-idle.patch fails to build without
    > the second of those two applied, so I didn't do any work to narrow it down
    > further.

    One thing to note is that we don't currently call the
    wake_up_forked_process() thing in our SMP idle bootup
    dispatcher in arch/sparc64/kernel/smp.c

    Perhaps that is somehow related to the problems.
    In that case the culprit would be the first patch,

    See arch/sparc64/kernel/smp.c:smp_boot_one_cpu() for details.
    When we start a cpu, by calling prom_startcpu(), the cpu
    jumps from the firmware into arch/sparc64/kernel/trampoline.S

    There, the cpu is initialized (just like it is for the boot cpu
    in arch/sparc64/kernel/head.S), the current_thread_info() (%g6)
    and 'current' (%g4) registers are initialized and the cpu jumps
    into smp_callin(). smp_callin() returns when it is safe to do
    so, which is when it's cpu bit is set in smp_commenced_mask.
    When that occurs, it's cpu bit is set in cpu_online_map and
    then it jumps right into cpu_idle().

    Hope this helps.
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