We have one event that preferably should be handled 'fast' and Greg
already provided a good hint as how to hand-tailor handling of an
interrupt.
OK, If you use a higher priority interrupt than Linux is aware of and is
able to block, and same is enabled to interrupt the Linux based ISRs,
you of course have no latency problems introduced by Linux.
As Greg points out, you can't use _any_ Linux stuff in your ISR. If you
want to transfer data from/to the Linux system, you can't use any
spinlocks, semaphores or something like that to synchronize the buffer
access.
-Michael
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