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The patch 9fe8895a27a8: "perf env: Add perf_env__cpuid, perf_env__{nr_}pmu_mappings" from Aug 17, 2021, leads to the following Smatch complaint: tools/perf/util/env.c:467 perf_env__cpuid() error: we previously assumed 'env' could be null (see line 461) tools/perf/util/env.c 457 const char *perf_env__cpuid(struct perf_env *env) 458 { 459 int status; 460 461 if (!env || !env->cpuid) { /* Assume local operation */ 462 status = perf_env__read_cpuid(env); 463 if (status) 464 return NULL; If env is NULL and perf_env__read_cpuid() return zero then we are toasted. 465 } 466 467 return env->cpuid; 468 } A couple of the neighboring functions are written the same way. I'm not sure why they don't generate checker warnings. regards, dan carpenter