linux-kernel - [tip:perf/urgent] perf auxtrace: Improve address filter error message when there is no DSO

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Date:   Sat, 9 Mar 2019 11:50:03 -0800
From:   tip-bot for Adrian Hunter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     alexander.shishkin@...ux.intel.com, hpa@...or.com,
        mingo@...nel.org, jolsa@...hat.com, acme@...hat.com,
        tglx@...utronix.de, linux-kernel@...r.kernel.org,
        adrian.hunter@...el.com
Subject: [tip:perf/urgent] perf auxtrace: Improve address filter error
 message when there is no DSO

Commit-ID:  c1c49204b0114daf210c79d66a5980c8e6f8f8fb
Gitweb:     https://git.kernel.org/tip/c1c49204b0114daf210c79d66a5980c8e6f8f8fb
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Fri, 1 Mar 2019 14:29:02 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 1 Mar 2019 14:47:06 -0300

perf auxtrace: Improve address filter error message when there is no DSO

The message does not indicate the possibility that the symbol is not
found because the file does not exist.

Before:

  $ perf record -e intel_pt//u --filter 'filter strcmp / strcpy @ foo ' ls
  Symbol 'strcmp' not found.
  Note that symbols must be functions.
  Failed to parse address filter: 'filter strcmp / strcpy @ foo '
  Filter format is: filter|start|stop|tracestop <start symbol or address> [/ <end symbol or size>] [@<file name>]
  Where multiple filters are separated by space or comma.

After:

  $ perf record -e intel_pt//u --filter 'filter strcmp / strcpy @ foo ' ls
  File 'foo' not found or has no symbols.
  Symbol 'strcmp' not found.
  Note that symbols must be functions.
  Failed to parse address filter: 'filter strcmp / strcpy @ foo '
  Filter format is: filter|start|stop|tracestop <start symbol or address> [/ <end symbol or size>] [@<file name>]
  Where multiple filters are separated by space or comma.

Reported-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: https://lkml.kernel.org/n/tip-dvngzxd0jkplzw1ary69dilb@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/auxtrace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index 267e54df511b..fb76b6b232d4 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -1918,7 +1918,8 @@ static struct dso *load_dso(const char *name)
 	if (!map)
 		return NULL;

-	map__load(map);
+	if (map__load(map) < 0)
+		pr_err("File '%s' not found or has no symbols.\n", name);

 	dso = dso__get(map->dso);