linux-kernel - [PATCH v6 04/47] perf report: Use function to add missing maps lock

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Date:   Wed,  6 Dec 2023 17:16:38 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nick Terrell <terrelln@...com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        "Steinar H. Gunderson" <sesse@...gle.com>,
        Liam Howlett <liam.howlett@...cle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Colin Ian King <colin.i.king@...il.com>,
        Dmitrii Dolgov <9erthalion6@...il.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Ming Wang <wangming01@...ngson.cn>,
        James Clark <james.clark@....com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Leo Yan <leo.yan@...aro.org>,
        Ravi Bangoria <ravi.bangoria@....com>,
        German Gomez <german.gomez@....com>,
        Changbin Du <changbin.du@...wei.com>,
        Paolo Bonzini <pbonzini@...hat.com>, Li Dong <lidong@...o.com>,
        Sandipan Das <sandipan.das@....com>,
        liuwenyu <liuwenyu7@...wei.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Guilherme Amadio <amadio@...too.org>
Subject: [PATCH v6 04/47] perf report: Use function to add missing maps lock

Switch maps__fprintf_task from loop macro maps__for_each_entry to
maps__for_each_map function that takes a callback. The function holds
the maps lock, which should be held during iteration.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-report.c | 54 +++++++++++++++++++++++++------------
 1 file changed, 37 insertions(+), 17 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 121a2781323c..a5d7bc5b843f 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -859,27 +859,47 @@ static struct task *tasks_list(struct task *task, struct machine *machine)
 	return tasks_list(parent_task, machine);
 }
 
-static size_t maps__fprintf_task(struct maps *maps, int indent, FILE *fp)
+struct maps__fprintf_task_args {
+	int indent;
+	FILE *fp;
+	size_t printed;
+};
+
+static int maps__fprintf_task_cb(struct map *map, void *data)
 {
-	size_t printed = 0;
-	struct map_rb_node *rb_node;
+	struct maps__fprintf_task_args *args = data;
+	const struct dso *dso = map__dso(map);
+	u32 prot = map__prot(map);
+	int ret;
 
-	maps__for_each_entry(maps, rb_node) {
-		struct map *map = rb_node->map;
-		const struct dso *dso = map__dso(map);
-		u32 prot = map__prot(map);
+	ret = fprintf(args->fp,
+		"%*s  %" PRIx64 "-%" PRIx64 " %c%c%c%c %08" PRIx64 " %" PRIu64 " %s\n",
+		args->indent, "", map__start(map), map__end(map),
+		prot & PROT_READ ? 'r' : '-',
+		prot & PROT_WRITE ? 'w' : '-',
+		prot & PROT_EXEC ? 'x' : '-',
+		map__flags(map) ? 's' : 'p',
+		map__pgoff(map),
+		dso->id.ino, dso->name);
 
-		printed += fprintf(fp, "%*s  %" PRIx64 "-%" PRIx64 " %c%c%c%c %08" PRIx64 " %" PRIu64 " %s\n",
-				   indent, "", map__start(map), map__end(map),
-				   prot & PROT_READ ? 'r' : '-',
-				   prot & PROT_WRITE ? 'w' : '-',
-				   prot & PROT_EXEC ? 'x' : '-',
-				   map__flags(map) ? 's' : 'p',
-				   map__pgoff(map),
-				   dso->id.ino, dso->name);
-	}
+	if (ret < 0)
+		return ret;
+
+	args->printed += ret;
+	return 0;
+}
+
+static size_t maps__fprintf_task(struct maps *maps, int indent, FILE *fp)
+{
+	struct maps__fprintf_task_args args = {
+		.indent = indent,
+		.fp = fp,
+		.printed = 0,
+	};
+
+	maps__for_each_map(maps, maps__fprintf_task_cb, &args);
 
-	return printed;
+	return args.printed;
 }
 
 static void task__print_level(struct task *task, FILE *fp, int level)
-- 
2.43.0.rc2.451.g8631bc7472-goog