>   why the extra work?
>
>maybe the code has changed in all the intervening years?

that's probably it.
   
>   this is the virtually same as sunos_sys_mmap(), svr4_sys_mmap(),
>   svr4_sys_mmap64(), and ultrix_sys_mmap().
>   
>   i can see why it might be done in svr4_32_sys_mmap(), maybe in
>   svr4_32_sys_mmap64(), and sunos32_sys_mmap().  they're designed to
>   operate in a mixed 32/64 bit environment, right?
>
>not "mixed".  the _32 versions are are running 32 bit applications
>in a 64 bit kernel environment.

right.  "mixed".  a 32 bit binary on a 64 bit "host".  :)

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