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    SubjectRe: [PATCH] PPC/PPC64: Introduce CPU_HAS_FEATURE() macro


    > This is the patch to evaluate CPU_HAS_FEATURE() at compile time whenever
    > possible. Testing showed that vmlinux shrinks around 4000 bytes with
    > g5_defconfig. I also checked that pSeries code is completely unaltered
    > semantically when support for all CPU types is enabled, although a few
    > instructions are emitted in a different order by gcc.
    > I have made cpu_has_feature() an inline function that expects the full
    > name of a feature bit while the CPU_HAS_FEATURE() macro still behaves
    > the same way as in Olofs original patch for now.

    Interesting :) However we already get bug reports with the current
    CONFIG_POWER4_ONLY option. I worry about adding more options that users
    could get wrong unless there is a noticeable improvement in performance.

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      Last update: 2005-03-22 14:10    [W:0.019 / U:35.844 seconds]
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