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Passing an empty map to perf_cpu_map__max triggered a SEGV. Explicitly test for the empty map. Reported-by: Ingo Molnar <mingo@kernel.org> Closes: https://lore.kernel.org/linux-perf-users/aSwt7yzFjVJCEmVp@gmail.com/ Tested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Ian Rogers <irogers@google.com> Tested-by: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>