K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2012-01-21T19:21:42.032111Z
K 7
svn:log
V 1304
MFC r228923, r228935, and r229007
  Eliminate many of the unnecessary differences between the native and
  paravirtualized pmap implementations for i386.

  Fix a bug in the Xen pmap's implementation of
  pmap_extract_and_hold(): If the page lock acquisition is retried,
  then the underlying thread is not unpinned.

  Wrap nearby lines that exceed 80 columns.

  Merge r216333 and r216555 from the native pmap
    When r207410 eliminated the acquisition and release of the page
    queues lock from pmap_extract_and_hold(), it didn't take into
    account that pmap_pte_quick() sometimes requires the page queues
    lock to be held.  This change reimplements pmap_extract_and_hold()
    such that it no longer uses pmap_pte_quick(), and thus never
    requires the page queues lock.

  Merge r177525 from the native pmap
    Prevent the overflow in the calculation of the next page
    directory.  The overflow causes the wraparound with consequent
    corruption of the (almost) whole address space mapping.

  Strictly speaking, r177525 is not required by the Xen pmap because
  the hypervisor steals the uppermost region of the normal kernel
  address space.  I am nonetheless merging it in order to reduce the
  number of unnecessary differences between the native and Xen pmap
  implementations.

END