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We should use "[unknown]" in this case, in concert with the code in _hist_entry__dso_snprintf(). Otherwise we'll crash when recomputing the histogram column lengths in hists__calc_col_len(). Signed-off-by: David S. Miller <davem@davemloft.net> Link: http://lkml.kernel.org/r/20120325.162822.2267799792062571623.davem@davemloft.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>