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    SubjectRe: [patch 4/21] fix ARCH_HAS_PREFETCH
    Alan Cox wrote:
    > On Wed, 2002-08-14 at 21:58, H. Peter Anvin wrote:
    >
    >>Since some processors now have "busy wait delay" instructions, this
    >>would also make it possible to do:
    >
    >
    > Nobody should be using an empty busy loop. If its a short timed busy
    > loop then they should be using udelay, if its a long one
    > schedule_timeout()
    >

    Indeed.

    > If its polling hardware then it isnt an empty loop

    True indeed as well, although we should still have a busy_wait(); macro
    that can insert whatever hint instruction the architecture might or
    might not have.

    -hpa


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