On Fri, 27 Mar 2015, Eric B Munson wrote:

quoted

munmap(2) of hugetlb memory requires a length that is hugepage aligned,
otherwise it may fail.  Add this to the documentation.

This also cleans up the documentation and separates it into logical
units: one part refers to MAP_HUGETLB and another part refers to
requirements for shared memory segments.

Signed-off-by: David Rientjes <rientjes@google.com>
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If this is the route we are going to take, this behavoir needs to be
called out prominently in the mmap/munmap man page.

Yeah, that was my next step, but before we get mtk involved I was trying 
to get this merged since man2/mmap.2 already has a 
.I Documentation/vm/hugetlbpage.txt for MAP_HUGETLB so the man page patch 
can simply reference this addition to the file as justification.