On Thu, Feb 19, 2004 at 07:32:10PM +0100, Lars Marowsky-Bree wrote:
> 
> A rule of thumb might be whether any code in the tree uses a given
> export, and if not, prune it. Anything which even we don't use or export
> across the user-land boundary certainly qualifies as a kernel interna.

political issues aside, this sounds like a decent rule-of-thumb in general;
if NO module uses it, it is most likely the wrong API (for example obsoleted API left
around) or something really internal.