>> it seems to me that splx() ought to be allowed to return void but that
>> the others should all return the previous ipl.  i can, after all,
>> always ignore the return value of the spl() function if i don't need
>> it, right?
>
>Erm, the point is that anyone trying to lower the spl should be doing it
>permanently, and hence shouldn't need to know the old one.  Anyone who
>needs to know what the spl was is probably doing the wrong thing.
>
>Also, it takes some effort for a function to return int rather than void,
>so making the spl-lowering functions return void should make them slightly
>faster.

well...since you put it that way it makes more sense.  i'll go back to
lurking.  :)

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