> Could you give a brief description on why the following change is needed?

>       9 -#define        KERNBASE        ((u_long)KERNBASE_LOCORE)
>      10 +#define        KERNBASE        (1UL * KERNBASE_LOCORE)

I didn't write it, but I think it's a good change, even if it may not
be truly "needed".

It has two characteristics I see as generally desirable:

(1) It does not depend on u_long being defined.

(2) It does not narrow the value if it's already wider than long.

Of course, in the context I infer from the names, it's probable neither
of these actually matters, but maintaining good practices even where
not strictly necessary is usually a good idea.

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