There are bigger problems here.  When the code calculates the size to map 
if size is passed as zero, it simply assigns the 64-bit st_size to the 
size to mmap.  On a 32-bit system, it is obvious that the amount to map 
must be less than a 32-bit value.  The calculation should take into 
account at least the following two things: 1) it should be the size of the 
file minus the offset, and 2) it shouldn't ask for an unreasonable amount 
of memory.  I will experiment with this and submit a new patch (and delete 
the two I've already uploaded) within a couple of days, or at a minimum, 
provide an update to this bug.