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    SubjectRe: [PATCH 9/11] Panic delay fix
    > >
    > >>Failure to use real-time delay here causes the
    > >>keyboard to become demonically
    > >>possessed in the event of a kernel crash, with wildly
    > >>blinking lights and
    > >>unpredictable behavior. This has resulted in several
    > >>injuries.
    > >
    > >There must be a reason why it wasn't default before.
    > >Has this
    > >reason changed?
    > This only matters under paravirt; non-paravirt kernels
    > and kernels running on native hardware will always
    > behave properly.
    > But paravirtualized kernels with fake devices have no
    > need to udelay to accommodate slow hardware - the
    > hardware is just virtual. The USE_REAL_TIME_DELAY
    > define allows udelay to be specifically reverted back to
    > being a real delay. There are only a couple cases where

    Ugh, it sounds like paravirt is more b0rken then I thought. It should
    always to the proper delay, then replace those udelays that are not
    needed on virtualized hardware with something else.

    Just magically defining udelay into nop is broken.

    (cesky, pictures)
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      Last update: 2007-02-07 14:03    [W:0.031 / U:13.408 seconds]
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