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    SubjectRe: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic
    Date
    On Sun May 24 2009, Michael S. Zick wrote:
    > On Sun May 24 2009, H. Peter Anvin wrote:
    > > Michael S. Zick wrote:
    > > >
    > > > @hpa - I still like your suggestion that it is only one (or a few)
    > > > uses of atomic ops that is incorrect and in general atomic ops
    > > > should compile away on uni-processor.
    > > >
    > >
    > > Actually, the more I think about it the more I suspect there is a race
    > > condition either in the chip set or in any VIA-specific drivers (if
    > > there are any.) Putting LOCKs in random places will slow the CPU down
    > > significantly, so it might resolve the race condition without actually
    > > solving the problem.
    > >
    >
    > They are mostly out of the -09143 and -09144 builds -
    > No cpufreq (I.E: no e_powersaver).
    > The padlock-* drivers are modules which must be manually loaded.
    >
    > The i2c-viapro driver (in spite of its comments) does not work
    > on CX700 (written before manual was released) - it is reading
    > the serial number rather than the second data port. ;)
    > (No access to the chipset temperature/voltage data on SMBus).
    >
    > The via-fb driver just "doesn't work" - Haven't looked at it yet.
    >
    > There is a VIA-specific driver for the VIA USB controller, but it
    > isn't in the x86 part of the tree - Haven't looked at it yet.
    >
    > There isn't a driver for the hardware watchdog on CX700 -
    > There isn't a driver for the machine error reporting -
    >
    > = = = =
    >
    > Although there may be timing requirement differences on the
    > CX700 and CN896 - I think more likely a human error (typo)
    > in the "clobber" lines of the asm - Have not yet audited that,
    > but it is high on my list.
    >
    > Note: I have seem to recall that newer gcc's optimizer presume
    > that the flags register is preserved across asm -
    > It didn't use to do that - but there is now a "cc" to deal with
    > that - Have not yet audited for that, but it is high on my list.
    >
    > Busy, busy, busy - -
    > The -09144lk on C7-M/CX700 now up for 3 3/4 hours close to a new
    > record - but ehci-hcd has not yet gone into a re-try loop.
    >

    The -09145{,lk}-db pair is posted now.
    Same code-base/config as the -09144{,lk} pair with the addition
    of lockdep checking.
    Details:
    http://forum.netbookuser.com/viewtopic.php?pid=6980#p6980

    Mike
    > Mike
    > > -hpa
    > >
    >
    >
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