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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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