linux-kernel - [PATCH 03/21] perf pmu: Make pmu_sys_event

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Date:   Thu,  7 Oct 2021 09:56:29 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        "Paul A . Clarke" <pc@...ibm.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Riccardo Mancini <rickyman7@...il.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        ToastC <mrtoastcheng@...il.com>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Felix Fietkau <nbd@....name>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Song Liu <songliubraving@...com>, Fabian Hemmer <copy@...y.sh>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Nicholas Fraser <nfraser@...eweavers.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Denys Zagorui <dzagorui@...co.com>,
        Wan Jiabing <wanjiabing@...o.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Sumanth Korikkar <sumanthk@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Changbin Du <changbin.du@...el.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH 03/21] perf pmu: Make pmu_sys_event_tables const.

Make lookup nature of data structures clearer through their type.

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

diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
index 5624a37d6f93..a31de0f77097 100644
--- a/tools/perf/pmu-events/jevents.c
+++ b/tools/perf/pmu-events/jevents.c
@@ -832,7 +832,7 @@ static void print_mapping_test_table(FILE *outfp)
 
 static void print_system_event_mapping_table_prefix(FILE *outfp)
 {
-	fprintf(outfp, "\nstruct pmu_sys_events pmu_sys_event_tables[] = {");
+	fprintf(outfp, "\nconst struct pmu_sys_events pmu_sys_event_tables[] = {");
 }
 
 static void print_system_event_mapping_table_suffix(FILE *outfp)
diff --git a/tools/perf/pmu-events/pmu-events.h b/tools/perf/pmu-events/pmu-events.h
index 42c6db6bedec..f6c9c9fc4ab2 100644
--- a/tools/perf/pmu-events/pmu-events.h
+++ b/tools/perf/pmu-events/pmu-events.h
@@ -54,6 +54,6 @@ struct pmu_sys_events {
  * table of PMU events.
  */
 extern const struct pmu_events_map pmu_events_map[];
-extern struct pmu_sys_events pmu_sys_event_tables[];
+extern const struct pmu_sys_events pmu_sys_event_tables[];
 
 #endif
diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c
index 8a1fdcd072f5..c0f8b61871c8 100644
--- a/tools/perf/tests/pmu-events.c
+++ b/tools/perf/tests/pmu-events.c
@@ -258,7 +258,7 @@ static const struct pmu_events_map *__test_pmu_get_events_map(void)
 
 static struct pmu_event *__test_pmu_get_sys_events_table(void)
 {
-	struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
+	const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
 
 	for ( ; tables->name; tables++) {
 		if (!strcmp("pme_test_soc_sys", tables->name))
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 4bcdc595ce5e..c04a89cc7cef 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -873,7 +873,7 @@ void pmu_for_each_sys_event(pmu_sys_event_iter_fn fn, void *data)
 	int i = 0;
 
 	while (1) {
-		struct pmu_sys_events *event_table;
+		const struct pmu_sys_events *event_table;
 		int j = 0;
 
 		event_table = &pmu_sys_event_tables[i++];
-- 
2.33.0.882.g93a45727a2-goog