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There is no session in perf trace unless in replay mode, so in host mode no session can be associated with the evlist. If the evsel__env call fails resort to the host_env that's part of the trace. Remove errno_to_name as it becomes a called once 1-line function once the argument is turned into a perf_env, just call perf_env__arch_strerrno directly. Signed-off-by: Ian Rogers <irogers@google.com> Link: https://lore.kernel.org/r/20250724163302.596743-19-irogers@google.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>