2.6.22-rc6-mm1: BUG_ON() mm/memory.c, vm_insert_pfn(), filemap_xip.c, and spufs

Recently there has been some discussion of the possiblity of reworking some of filemap_xip.c to be pfn oriented. This would allow an XIP fork of cramfs to use the filemap_xip framework. Today this is not possible. I've been trying out vm_insert_pfn() to start down that road. I used spufs as a

2.6.22-rc6-mm1: BUG_ON() mm/memory.c, vm_insert_pfn(), filemap_xip.c, and spufs

Recently there has been some discussion of the possiblity of reworking some of filemap_xip.c to be pfn oriented. This would allow an XIP fork of cramfs to use the filemap_xip framework. Today this is not possible. I've been trying out vm_insert_pfn() to start down that road. I used spufs as a