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    SubjectRe: [PATCH] 2.6 workaround for Athlon/Opteron prefetch errata
    On Fri, Sep 12, 2003 at 01:59:43PM -0400, Jeff Garzik wrote:
    > Andi Kleen wrote:
    > >The main reason I'm really against this is that currently the P4 kernels
    > >work
    > >fine on Athlon. Just when is_prefetch is not integrated in them there will
    > >be an mysterious oops once every three months in the kernel in prefetch
    > >on Athlon.
    >
    >
    > Booting a P4 kernel _without_ CONFIG_X86_GENERIC on an Athlon would be a
    > user bug.

    But even CONFIG_X86_GENERIC doesn't do what you expect. A kernel
    compiled for Athlon wouldn't run on a Pentium 4 even with
    CONFIG_X86_GENERIC.

    Quoting arch/i386/Kconfig in -test5:

    <-- snip -->

    config X86_USE_3DNOW
    bool
    depends on MCYRIXIII || MK7
    default y

    <-- snip -->

    My patch in the mail

    RFC: [2.6 patch] better i386 CPU selection

    tries to solve these problem with a different approach (the user selects
    all CPUs he wants to support).

    > Jeff

    cu
    Adrian

    --

    "Is there not promise of rain?" Ling Tan asked suddenly out
    of the darkness. There had been need of rain for many days.
    "Only a promise," Lao Er said.
    Pearl S. Buck - Dragon Seed

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