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    SubjectRe: [thiscpuops upgrade 09/10] x86: this_cpu_cmpxchg and this_cpu_cmpxchg_double operations
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    On Wed, 24 Nov 2010, Eric Dumazet wrote:
    >> You have to check cx16 feature flag or implement a fallback ?

    On Wed, Nov 24, 2010 at 5:11 AM, Christoph Lameter <cl@linux.com> wrote:
    > There is already a compile time fallback. Uhh.. How do I do this at
    > runtime?

    I think the CPU alternatives API is meant for just that. Grep for
    "alternative" in arch/x86.


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