[PATCH v2 4/6] perf pmu: Make id const and add missing free

[Ian Rogers <irogers@google.com>]

The struct pmu id is initialized from pmu_id that is read into
allocated memory from a file, as such it needs free-ing in
pmu__delete. Make the id value const so that we can remove casts in
tests.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/tests/pmu-events.c | 4 ++--
 tools/perf/util/pmu.c         | 1 +
 tools/perf/util/pmu.h         | 2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c
index 94937378647a..eb243392c0f4 100644
--- a/tools/perf/tests/pmu-events.c
+++ b/tools/perf/tests/pmu-events.c
@@ -684,7 +684,7 @@ static struct perf_pmu_test_pmu test_pmus[] = {
 		.pmu = {
 			.name = "uncore_sys_ddr_pmu0",
 			.is_uncore = 1,
-			.id = (char *)"v8",
+			.id = "v8",
 		},
 		.aliases = {
 			&sys_ddr_pmu_write_cycles,
@@ -694,7 +694,7 @@ static struct perf_pmu_test_pmu test_pmus[] = {
 		.pmu = {
 			.name = "uncore_sys_ccn_pmu4",
 			.is_uncore = 1,
-			.id = (char *)"0x01",
+			.id = "0x01",
 		},
 		.aliases = {
 			&sys_ccn_pmu_read_cycles,
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index eb42f9830be7..b92dc7237f3b 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -2056,6 +2056,7 @@ void perf_pmu__delete(struct perf_pmu *pmu)
 	zfree(&pmu->default_config);
 	zfree(&pmu->name);
 	zfree(&pmu->alias_name);
+	zfree(&pmu->id);
 	free(pmu);
 }
 
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index e90169ab3dc2..73965f208009 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -49,7 +49,7 @@ struct perf_pmu {
 	 * @id: Optional PMU identifier read from
 	 * <sysfs>/bus/event_source/devices/<name>/identifier.
 	 */
-	char *id;
+	const char *id;
 	/**
 	 * @type: Perf event attributed type value, read from
 	 * <sysfs>/bus/event_source/devices/<name>/type.
-- 
2.42.0.rc2.253.gd59a3bf2b4-goog