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From: Attilio Rao <attilio@FreeBSD.org>
Date: Wed, 4 Nov 2009 01:32:59 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/amd64/amd64 identcpu.c src/sys/i386/i386
 identcpu.c
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attilio     2009-11-04 01:32:59 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      identcpu.c 
    sys/i386/i386        identcpu.c 
  Log:
  SVN rev 198868 on 2009-11-04 01:32:59Z by attilio
  
  Opteron rev E family of processor expose a bug where, in very rare
  ocassions, memory barriers semantic is not honoured by the hardware
  itself. As a result, some random breakage can happen in uninvestigable
  ways (for further explanation see at the content of the commit itself).
  
  As long as just a specific familly is bugged of an entire architecture
  is broken, a complete fix-up is impratical without harming to some
  extents the other correct cases.
  Considering that (and considering the frequency of the bug exposure)
  just print out a warning message if the affected machine is identified.
  
  Pointed out by: Samy Al Bahra <sbahra at repnop dot org>
  Help on wordings by:    jeff
  MFC:    3 days
  
  Revision  Changes    Path
  1.176     +18 -0     src/sys/amd64/amd64/identcpu.c
  1.204     +18 -0     src/sys/i386/i386/identcpu.c