K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2010-10-21T17:29:32.895353Z
K 7
svn:log
V 355
- Make 'vm_refcnt' volatile so that compilers won't be tempted to treat
  its value as a loop invariant.  Currently this is a no-op because
  'atomic_cmpset_int()' clobbers all memory on current architectures.
- Use atomic_fetchadd_int() instead of an atomic_cmpset_int() loop to drop
  a reference in vmspace_free().

Reviewed by:	alc
MFC after:	1 month

END