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    SubjectRe: [PATCH tip:x86/mm 1/3] x86: A fast way to check capabilities of the current cpu
    On 03/14/2011 12:49 PM, Andi Kleen wrote:
    > Tejun Heo <tj@kernel.org> writes:
    >
    >> Add this_cpu_has() which determines if the current cpu has a certain
    >> ability using a segment prefix and a bit test operation.
    >
    >
    > Hmm: if the CPU capability is really tested in a performance critical
    > path, wouldn't it even be better to just use static_branch() now?
    >

    We have static_cpu_has() for this specific purpose (it actually predates
    static_branch()).

    -hpa

    --
    H. Peter Anvin, Intel Open Source Technology Center
    I work for Intel. I don't speak on their behalf.



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