[Xenomai-help] unable to load nucleus module: unknown symbol

[Jeff Weber <jweber@domain.hid>]

I've built the xeno_nucleus as a module.  Neither depmod, nor modprobe
can resolve the symbol "find_task_by_pid_ns":

depmod:
WARNING:
/lib/modules/2.6.31.5-xenomai-2.4.10/kernel/kernel/xenomai/nucleus/xeno_nucleus.ko
needs unknown symbol find_task_by_pid_ns

modprobe [dmesg]:
[  426.728630] xeno_nucleus: Unknown symbol find_task_by_pid_ns

Curiously, this symbol is in both my build System.map, and the kernel

bash # grep find_task_by_pid_ns System.map
c102ecf6 T find_task_by_pid_ns

bash # cat /proc/kallsyms | grep find_task_by_pid_ns
c102ecf6 T find_task_by_pid_ns

so this symbol should be publicly available.  I also noticed there is no
EXPORT_SYMBOL() for find_task_by_pid_ns in the kernel code.

Any ideas what's keeping my xeno_nucleus.ko module from loading?

My config:
linux-2.6.31.5 (current stable)
xenomai-2.4.10
adeos-ipipe-2.6.31.1-x86-2.4-06.patch

thanks,
Jeff
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