The slab cache needs the mapping for a longer time and cannot use the hyperspace mapping. I would remove the slab cache, because it is not used by any of the kernel functions.
Remove it, IIRC it's something that we don't use anymore.
Already done, look at ros-svn :)
===== Usurp (aka Sylvain Petreolle) humans are like computers, yesterday the BIOS was all - today its just a word