staging/rdma/hfi1: convert buffers allocated atomic to per cpu
Profiling has shown the the atomic is a performance issue for the pio hot path. If multiple cpus allocated an sc's buffer, the cacheline containing the atomic will bounce from L0 to L0. Convert the atomic to a percpu variable. Reviewed-by: Jubin John <jubin.john@intel.com> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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