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From: John Baldwin <jhb@FreeBSD.org>
Date: Fri, 22 Jan 2010 21:23:09 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: RELENG_7
Subject: cvs commit: src/sys/amd64/amd64 pmap.c src/sys/i386/i386 pmap.c
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jhb         2010-01-22 21:23:09 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_7)
    sys/amd64/amd64      pmap.c 
    sys/i386/i386        pmap.c 
  Log:
  SVN rev 202837 on 2010-01-22 21:23:09Z by jhb
  
  MFC 189698,192035:
  Optimize the inner loop of pmap_copy().
  
  Correct a rare use-after-free error in pmap_copy().  This error was
  introduced in amd64 revision 1.540 and i386 revision 1.547.  However, it
  had no harmful effects until after a recent change, r189698, on amd64.
  (In other words, the error is harmless in RELENG_7.)
  
  The error is triggered by the failure to allocate a pv entry for the one
  and only mapping in a page table page.  I am addressing the error by
  changing pmap_copy() to abort if either pv entry allocation or page
  table page allocation fails.  This is appropriate because the creation of
  mappings by pmap_copy() is optional.  They are a (possible) optimization,
  and not a requirement.
  
  Correct a nearby whitespace error in the i386 pmap_copy().
  
  Revision    Changes    Path
  1.590.2.31  +9 -4      src/sys/amd64/amd64/pmap.c
  1.594.2.25  +4 -2      src/sys/i386/i386/pmap.c