K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2006-09-27T18:10:16.000000Z
K 7
svn:log
V 528
MFC
  Correct a very old and very obscure bug: vmspace_fork() calls
  pmap_copy() if the mapping is VM_INHERIT_SHARE.  Suppose the mapping
  is also wired.  vmspace_fork() clears the wiring attributes in the vm
  map entry but pmap_copy() copies the PG_W attribute in the PTE.  I
  don't think this is catastrophic.  It blocks pmap_remove_pages() from
  destroying the mapping and corrupts the pmap's wiring count.

  This revision fixes the problem by changing pmap_copy() to clear the
  PG_W attribute.

Approved by: re (mux)

END