tree bac37b89300c8941a4b547aa8004e4e07f734b68
parent 4249ab915a31945601fa82f714d942f917cb0f9c
author Barret Rhoden <brho@cs.berkeley.edu> 1568407731 -0400
committer Barret Rhoden <brho@cs.berkeley.edu> 1570569071 -0400

arena: allow a nocross xalloc() with a source arena

When we need to import segments from a parent arena to satisfy an
xalloc, we need to make sure that a successful import actually satisfies
the xalloc.

This doesn't seem easily solvable for min/maxaddr, short of pushing the
xalloc all the way down the chain or having some other inter-arena
interface.  But it should be solvable for nocross, by getting a large
enough allocation.

Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>