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Add upper bound check on nr_nodes in process_hybrid_topology() to harden against malformed perf.data files (reuses MAX_PMU_MAPPINGS, 4096). Cc: Ian Rogers <irogers@google.com> Assisted-by: Claude Code:claude-opus-4-6 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>