Re: [PATCH v1 06/10] perf evsel: Allow const evsel for certain accesses

[Arnaldo Carvalho de Melo]

Em Wed, Mar 01, 2023 at 08:12:07PM -0800, Ian Rogers escreveu:
> List sorting, added later to evlist, passes const elements requiring
> helper functions to also be const. Make the argument to
> evsel__find_pmu, evsel__is_aux_event and evsel__leader const.

But then you have to de-constify it at some point :-\

- Arnaldo
 
> Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
> ---
>  tools/perf/util/evsel.c  | 2 +-
>  tools/perf/util/evsel.h  | 6 +++---
>  tools/perf/util/pmu.c    | 6 +++---
>  tools/perf/util/python.c | 2 +-
>  4 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 51e8ce6edddc..2dc2c24252bb 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -3139,7 +3139,7 @@ bool evsel__is_hybrid(const struct evsel *evsel)
>  	return evsel->pmu_name && perf_pmu__is_hybrid(evsel->pmu_name);
>  }
>  
> -struct evsel *evsel__leader(struct evsel *evsel)
> +struct evsel *evsel__leader(const struct evsel *evsel)
>  {
>  	return container_of(evsel->core.leader, struct evsel, core);
>  }
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 814a49ebb7e3..676c499323e9 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -212,8 +212,8 @@ int evsel__object_config(size_t object_size,
>  			 int (*init)(struct evsel *evsel),
>  			 void (*fini)(struct evsel *evsel));
>  
> -struct perf_pmu *evsel__find_pmu(struct evsel *evsel);
> -bool evsel__is_aux_event(struct evsel *evsel);
> +struct perf_pmu *evsel__find_pmu(const struct evsel *evsel);
> +bool evsel__is_aux_event(const struct evsel *evsel);
>  
>  struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx);
>  
> @@ -505,7 +505,7 @@ int evsel__store_ids(struct evsel *evsel, struct evlist *evlist);
>  
>  void evsel__zero_per_pkg(struct evsel *evsel);
>  bool evsel__is_hybrid(const struct evsel *evsel);
> -struct evsel *evsel__leader(struct evsel *evsel);
> +struct evsel *evsel__leader(const struct evsel *evsel);
>  bool evsel__has_leader(struct evsel *evsel, struct evsel *leader);
>  bool evsel__is_leader(struct evsel *evsel);
>  void evsel__set_leader(struct evsel *evsel, struct evsel *leader);
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 43b6182d96b7..45d9b8e28e16 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -988,7 +988,7 @@ struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
>  	return NULL;
>  }
>  
> -struct perf_pmu *evsel__find_pmu(struct evsel *evsel)
> +struct perf_pmu *evsel__find_pmu(const struct evsel *evsel)
>  {
>  	struct perf_pmu *pmu = NULL;
>  
> @@ -1000,11 +1000,11 @@ struct perf_pmu *evsel__find_pmu(struct evsel *evsel)
>  			break;
>  	}
>  
> -	evsel->pmu = pmu;
> +	((struct evsel *)evsel)->pmu = pmu;

Hu

>  	return pmu;
>  }
>  
> -bool evsel__is_aux_event(struct evsel *evsel)
> +bool evsel__is_aux_event(const struct evsel *evsel)
>  {
>  	struct perf_pmu *pmu = evsel__find_pmu(evsel);
>  
> diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
> index 42e8b813d010..ab48ffbb6448 100644
> --- a/tools/perf/util/python.c
> +++ b/tools/perf/util/python.c
> @@ -83,7 +83,7 @@ const char *perf_env__arch(struct perf_env *env __maybe_unused)
>   * far, for the perf python binding known usecases, revisit if this become
>   * necessary.
>   */
> -struct perf_pmu *evsel__find_pmu(struct evsel *evsel __maybe_unused)
> +struct perf_pmu *evsel__find_pmu(const struct evsel *evsel __maybe_unused)
>  {
>  	return NULL;
>  }
> -- 
> 2.39.2.722.g9855ee24e9-goog
> 

-- 

- Arnaldo