Hi folks...

With the help of Matt Thomas, I just fixed a major bug in the Alpha
bus_dma backend.

This bug only affected systems with large amounts of RAM (more than 1G).

The problem was that the wrong routine was being called for most DMA map
unloads, resulting in a resource leak.

The fix was quite simple, and has been verified on an XP1000 with 2G
of RAM.

FYI ...

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>