> 
> My only concern is porting drivers from other OSs.  If we end up
> needing to put in
> 
> #ifndef CLSIZE
> #define CLSIZE 1
> #endif
> 
> for this, I'd rather leave it in there, but define and mark it for
> compatibility with drivers only.
> 
Well, there is actually no reason not to keep the CL* macros in sys/param.h
defined as

#define CLSIZE 1
#define CLBYTES NBPG
...

for compatibility reasons. Even if I doubt that there is almost anything
out there that have used the CL* macros for something useful the last 
10 years :-)

-- Ragge