Messages in this thread | | | From | "Michael S. Zick" <> | Subject | Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic | Date | Sat, 30 May 2009 10:48:07 -0500 |
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On Sun May 24 2009, Harald Welte wrote: > Dear hpa, and others, > > On Sat, May 23, 2009 at 04:44:08PM -0700, H. Peter Anvin wrote: > > It looks like there might be a problem with the C7-M ... Michael reports > > that if he sets LOCK_PREFIX to "lock;" it works, but that shouldn't be > > necessary for a uniprocessor. > > > > I will try my best to help, though I have to admit I'm far from being > a x86 expert, and particularly not with regard to low-level bits such as atomic > operations. > > So please give me some time to research some background about that, > and read up all the details on the currently reported/described problem. > > Once I understand it in full detail, I can talk to the right people inside > CentaurLabs (VIA's CPU division). > > If somebody (optionally) can phrase a precise technical question that I can > directly forward to somebody with low-level x86 knowledge but no Linux background, > it would definitely help speeding up the process. >
Does the C7-M instruction set define the 'pause' instruction (0xf3,0x90)? *Defined* since the P-4, but backward compatible with earlier ia32 processors even though it falls into the "don't use rep before non-string instructions".
Mike
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