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    Subject[cpuops cmpxchg double V1 0/4] this_cpu_cmpxchg_double support
    This patch series introduces this_cpu_cmpxchg_double().

    x86 cpus support cmpxchg16b and cmpxchg8b that can be used to perform a
    cmpxchg with two words instead of only one. That allows to put more state
    into an atomic instruction.

    this_cpu_cmpxchg_double() is then used in the slub allocator to avoid
    interrupt disable/enable in both alloc and free fastpath.
    this_cpu_cmpxchg_double works nicely with the per cpu data of the
    allocator. Doing so significantly speeds up the fastpaths.



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