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The exp_lock lock does not need to be a spinlock as all its uses are in process context and allowing the process to sleep when the mutex is contended might be beneficial. Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>