K 10 svn:author V 8 hselasky K 8 svn:date V 27 2015-02-10T13:25:29.001246Z K 7 svn:log V 238 MFC r278074: 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. END