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    SubjectRe: [PATCH] 2.6 workaround for Athlon/Opteron prefetch errata
    Andi Kleen wrote:
    > On Thu, 11 Sep 2003 10:34:36 -0400
    > Jeff Garzik <> wrote:
    >>>X86_GENERIC is merely an optimization hint (currently it only changes the cache
    >>>line size hint) It does not change anything related to correctness. Everything
    >>>that handles correctness is checked unconditionally.
    >>When, building non-Pentium4-related code when CONFIG_MPENTIUM4 &&
    >>!CONFIG_X86_GENERIC, it's OK that the code is incorrect for (picking
    >>example) AMD processors.
    > No 2.6 changed that. On 2.6 you can exchange the kernels.
    > [that was mainly done for distributions, but helps other users too]

    If distributions are not building with CONFIG_X86_GENERIC, then they're
    broken. So it was rather pointless for 2.6 to "change that."

    Luckily, CONFIG_X86_GENERIC allows us the opportunity to be _less_
    generic when it's not defined, regardless of what you originally
    intended ;-)


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