the set-up functions will be called, so it is perfectly acceptable
for a compat code's routine to be called ahead of the code in other
parts of the kernel.
So make sure that the 2nd level sysctl node ``vfs.generic'' exists
before trying to add the 3rd level entries.
XXX Rather than creating the 2nd level node in two places, we could
XXX add the shared ``vfs.generic'' node to sysctl_init_base.c but
XXX this is left for another day.
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