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Message-ID: <20090425081914.GD2428@ucw.cz> Date: Sat, 25 Apr 2009 10:19:14 +0200 From: Pavel Machek <pavel@....cz> To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> Cc: akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org, mark.langsdorf@....com, arekm@...en.pl, "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>, Avi Kivity <avi@...ranet.com> Subject: Re: [patch 2/2] x86 amd fix cmpxchg read acquire barrier On Wed 2009-04-22 16:18:54, Mathieu Desnoyers wrote: > http://google-perftools.googlecode.com/svn-history/r48/trunk/src/base/atomicops-internals-x86.cc > > says > > " // Opteron Rev E has a bug in which on very rare occasions a locked > // instruction doesn't act as a read-acquire barrier if followed by a > // non-locked read-modify-write instruction. Rev F has this bug in > // pre-release versions, but not in versions released to customers, > // so we test only for Rev E, which is family 15, model 32..63 inclusive. Could we be more careful here and catch the F pre-release versions, too? Stepping should help there... -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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