Date: Wed, 4 Nov 2009 01:32:59 +0000 (UTC) From: Attilio Rao <attilio@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/amd64/amd64 identcpu.c src/sys/i386/i386 identcpu.c Message-ID: <200911040133.nA41XN53038083@repoman.freebsd.org>
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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
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