>Unnecessary. Note that you can distinguish old and new trivially, by
>the expedient of noting that the top 16 bits of old are always
>zero. This means that /dev/console (as 0,0) is the only special case
>you have to worry about.

that's not entirely accurate...you actually need to worry about
anything with a major number of 0.  this would include the block
interfaces for the wd? devices.

reason being...

/dev/console:
0,0 (under 16 bits) --> 0000000000000000 00000000 00000000
                             unused        major    minor
0,0 (under 32 bits) --> 0000000000000000 0000000000000000
                             major              minor
/dev/wd0b:
0,1 (under 16 bits) --> 0000000000000000 00000000 00000001
                             unused        major    minor
0,1 (under 32 bits) --> 0000000000000000 0000000000000001
                             major              minor

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