Messages in this thread | | | From | Namhyung Kim <> | Date | Sun, 8 Oct 2023 23:14:12 -0700 | Subject | Re: [PATCH v2 07/18] perf env: Remove unnecessary NULL tests |
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On Thu, Oct 5, 2023 at 4:09 PM Ian Rogers <irogers@google.com> wrote: > > clang-tidy was warning: > ``` > util/env.c:334:23: warning: Access to field 'nr_pmu_mappings' results in a dereference of a null pointer (loaded from variable 'env') [clang-analyzer-core.NullDereference] > env->nr_pmu_mappings = pmu_num; > ``` > > As functions are called potentially when !env was true. This condition > could never be true as it would produce a segv, so remove the > unnecessary NULL tests and silence clang-tidy.
IIRC !env was to handle live sessions like perf top or when it doesn't have a perf data file. Anyway, it doesn't seem to work anymore.
Thanks, Namhyung
> > Signed-off-by: Ian Rogers <irogers@google.com> > --- > tools/perf/util/env.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c > index a164164001fb..44140b7f596a 100644 > --- a/tools/perf/util/env.c > +++ b/tools/perf/util/env.c > @@ -457,7 +457,7 @@ const char *perf_env__cpuid(struct perf_env *env) > { > int status; > > - if (!env || !env->cpuid) { /* Assume local operation */ > + if (!env->cpuid) { /* Assume local operation */ > status = perf_env__read_cpuid(env); > if (status) > return NULL; > @@ -470,7 +470,7 @@ int perf_env__nr_pmu_mappings(struct perf_env *env) > { > int status; > > - if (!env || !env->nr_pmu_mappings) { /* Assume local operation */ > + if (!env->nr_pmu_mappings) { /* Assume local operation */ > status = perf_env__read_pmu_mappings(env); > if (status) > return 0; > @@ -483,7 +483,7 @@ const char *perf_env__pmu_mappings(struct perf_env *env) > { > int status; > > - if (!env || !env->pmu_mappings) { /* Assume local operation */ > + if (!env->pmu_mappings) { /* Assume local operation */ > status = perf_env__read_pmu_mappings(env); > if (status) > return NULL; > -- > 2.42.0.609.gbb76f46606-goog >
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