> well, uhh, if anyone's interested, i narrowed the problem down to just
> SMP machines. it sure seems like this symbol is pretty well exported,
> and <linux/sched.h> is definitely #included in my source, but everyone
> who tries to insmod it on an SMP machine (even me) gets the same
> message:
I've just woken up, so I might be about to talk crap, but:
On UP, rwlock_t (which is what tasklist_lock is) is an empty structure, i.e.
it takes no space. The macros that use it - {read,write}_{,un}lock - don't do
anything on UP[1]. When compiled for SMP, the lock exists and the macros
operate on it. AFAICS, tasklist_lock is not exported from the kernel anywhere
- there needs to be an
EXPORT_SYMBOL(tasklist_lock)
somewhere for it to be visible from modules.
I guess you need to submit a patch that adds that to the appropriate section
of kernel/ksyms.c if you want your module to work with stock kernels. Otherwise,
just add it to your local kernel.
S.
[1] As of 2.3.8ish, the macros reference the empty structure on UP even though
they don't do anything, to avoid 'unused variable' messages. So your module
won't work on UP either for 2.3.8+.
--
"Pascal is Pascal is Pascal is dog meat."
-- M. Devine and P. Larson, Computer Science 340
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