to pass any real configuration data. This benefits things like
rump_smbfs which need to init rump before running the userspace
mount routines (because they make rump system calls) but cannot
run p2k_setup() at that stage because it requires data provided by
the userspace mount routines. And p2k_setup() in turn forks (to
detach), so it cannot be run after rump has been inited and threads
have been created.
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