percpu: Fixup __this_cpu_xchg* operations
Somehow we got into a situation where the __this_cpu_xchg() operations were not defined in the same way as this_cpu_xchg() and friends. I had some build failures under 32 bit that were addressed by these fixes. Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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