Date:   Thu,  2 Mar 2023 13:25:26 -0800
In-Reply-To: <20230302212531.1043318-1-irogers@google.com>
Message-Id: <20230302212531.1043318-6-irogers@google.com>
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References: <20230302212531.1043318-1-irogers@google.com>
Subject: [PATCH v2 05/10] perf evsel: Allow const evsel for certain accesses
From:   Ian Rogers <irogers@google.com>
To:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Kan Liang <kan.liang@linux.intel.com>,
        Zhengjun Xing <zhengjun.xing@linux.intel.com>,
        Ravi Bangoria <ravi.bangoria@amd.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        "Steinar H. Gunderson" <sesse@google.com>,
        Kim Phillips <kim.phillips@amd.com>,
        Florian Fischer <florian.fischer@muhq.space>,
        James Clark <james.clark@arm.com>,
        Suzuki Poulouse <suzuki.poulose@arm.com>,
        Sean Christopherson <seanjc@google.com>,
        Leo Yan <leo.yan@linaro.org>,
        John Garry <john.g.garry@oracle.com>,
        Kajol Jain <kjain@linux.ibm.com>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Stephane Eranian <eranian@google.com>,
        Ian Rogers <irogers@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

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.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 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;
 	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;
 }
-- 
2.40.0.rc0.216.gc4246ad0f0-goog