linux-kernel - [PATCH v4 03/22] perf tests: Add common error route for code-reading

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Date:   Sun, 19 Mar 2023 20:37:51 -0700
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>,
        Thomas Gleixner <tglx@...utronix.de>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        "André Almeida" <andrealmeid@...labora.com>,
        James Clark <james.clark@....com>,
        John Garry <john.g.garry@...cle.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Leo Yan <leo.yan@...aro.org>, Andi Kleen <ak@...ux.intel.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Shunsuke Nakamura <nakamura.shun@...itsu.com>,
        Song Liu <song@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Miaoqian Lin <linmq006@...il.com>,
        Stephen Brennan <stephen.s.brennan@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        German Gomez <german.gomez@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, Hao Luo <haoluo@...gle.com>
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v4 03/22] perf tests: Add common error route for code-reading

A later change will enforce that the map is put on this path
regardless of success or error.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/tests/code-reading.c | 39 +++++++++++++++++++--------------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index cb8cd09938d5..fb67fd5ebd9f 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -236,18 +236,19 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 	const char *objdump_name;
 	char decomp_name[KMOD_DECOMP_LEN];
 	bool decomp = false;
-	int ret;
+	int ret, err = 0;
 
 	pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
 
 	if (!thread__find_map(thread, cpumode, addr, &al) || !al.map->dso) {
 		if (cpumode == PERF_RECORD_MISC_HYPERVISOR) {
 			pr_debug("Hypervisor address can not be resolved - skipping\n");
-			return 0;
+			goto out;
 		}
 
 		pr_debug("thread__find_map failed\n");
-		return -1;
+		err = -1;
+		goto out;
 	}
 
 	pr_debug("File is: %s\n", al.map->dso->long_name);
@@ -255,7 +256,7 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 	if (al.map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
 	    !dso__is_kcore(al.map->dso)) {
 		pr_debug("Unexpected kernel address - skipping\n");
-		return 0;
+		goto out;
 	}
 
 	pr_debug("On file address is: %#"PRIx64"\n", al.addr);
@@ -272,15 +273,18 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 					al.addr, buf1, len);
 	if (ret_len != len) {
 		pr_debug("dso__data_read_offset failed\n");
-		return -1;
+		err = -1;
+		goto out;
 	}
 
 	/*
 	 * Converting addresses for use by objdump requires more information.
 	 * map__load() does that.  See map__rip_2objdump() for details.
 	 */
-	if (map__load(al.map))
-		return -1;
+	if (map__load(al.map)) {
+		err = -1;
+		goto out;
+	}
 
 	/* objdump struggles with kcore - try each map only once */
 	if (dso__is_kcore(al.map->dso)) {
@@ -290,12 +294,12 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 			if (state->done[d] == al.map->start) {
 				pr_debug("kcore map tested already");
 				pr_debug(" - skipping\n");
-				return 0;
+				goto out;
 			}
 		}
 		if (state->done_cnt >= ARRAY_SIZE(state->done)) {
 			pr_debug("Too many kcore maps - skipping\n");
-			return 0;
+			goto out;
 		}
 		state->done[state->done_cnt++] = al.map->start;
 	}
@@ -306,7 +310,8 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 						 decomp_name,
 						 sizeof(decomp_name)) < 0) {
 			pr_debug("decompression failed\n");
-			return -1;
+			err = -1;
+			goto out;
 		}
 
 		decomp = true;
@@ -337,15 +342,16 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 				 */
 				pr_debug("objdump failed for kcore");
 				pr_debug(" - skipping\n");
-				return 0;
 			} else {
-				return -1;
+				err = -1;
 			}
+			goto out;
 		}
 	}
 	if (ret < 0) {
 		pr_debug("read_via_objdump failed\n");
-		return -1;
+		err = -1;
+		goto out;
 	}
 
 	/* The results should be identical */
@@ -355,11 +361,12 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 		dump_buf(buf1, len);
 		pr_debug("buf2 (objdump):\n");
 		dump_buf(buf2, len);
-		return -1;
+		err = -1;
+		goto out;
 	}
 	pr_debug("Bytes read match those read by objdump\n");
-
-	return 0;
+out:
+	return err;
 }
 
 static int process_sample_event(struct machine *machine,
-- 
2.40.0.rc1.284.g88254d51c5-goog