Hans Petter Selasky 8b1ce3297a Optimise allocation of USB DMA structures. By default don't double map
allocations if only one element should be allocated per page
cache. Make one allocation per element compile time configurable. Fix
a comment while at it.

Suggested by:	ian @
MFC after:	1 week
2015-02-02 11:32:15 +00:00
..
2015-01-16 12:16:21 +00:00
2015-01-16 12:16:21 +00:00