Quick piece of kernel history. There used to be a limit of 64 pty pairs,
because they were some of the devices that used major 4. This was a
limitation of a very early kernel.
When Ted Ts'o revamped the tty layers (which was in 1.3.39), he added
support for new pty master and slaves which used majors 3 and 2. This
allowed for 256 pty pairs. He maintained _compatability_, and allowed
the old 64 pty pairs to remain working (see old_pty_driver in pty.c).
The change in 2.1.115 is the removal of the _compatability_ for the 1.2
style devices. If you create your pty pairs using the new major numbers,
it will work for all of 2.0 and 2.1.
Unless you are planning on skipping back to kernel 1.2.13, there is no
need to recreate the traditional pty devices.
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