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    SubjectRe: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic
    Date
    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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