linux-kernel - [PATCH] perf test session topology: Fix data path

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Date:   Thu, 23 Apr 2020 14:53:40 +0300
From:   Tommi Rantala <tommi.t.rantala@...ia.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Tommi Rantala <tommi.t.rantala@...ia.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Mamatha Inamdar <mamatha4@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] perf test session topology: Fix data path

Commit 2d4f27999b88 ("perf data: Add global path holder") missed path
conversion in tests/topology.c, causing the "Session topology" testcase
to "hang" (waits forever for input from stdin) when doing "ssh $VM perf
test".

Can be reproduced by running "cat | perf test topo", and crashed by
replacing cat with true:

  $ true | perf test -v topo
  40: Session topology                                      :
  --- start ---
  test child forked, pid 3638
  templ file: /tmp/perf-test-QPvAch
  incompatible file format
  incompatible file format (rerun with -v to learn more)
  free(): invalid pointer
  test child interrupted
  ---- end ----
  Session topology: FAILED!

Fixes: 2d4f27999b88 ("perf data: Add global path holder")
Signed-off-by: Tommi Rantala <tommi.t.rantala@...ia.com>
---
 tools/perf/tests/topology.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/tools/perf/tests/topology.c b/tools/perf/tests/topology.c
index 4a800499d7c3..22daf2bdf5fa 100644
--- a/tools/perf/tests/topology.c
+++ b/tools/perf/tests/topology.c
@@ -33,10 +33,8 @@ static int session_write_header(char *path)
 {
 	struct perf_session *session;
 	struct perf_data data = {
-		.file      = {
-			.path = path,
-		},
-		.mode      = PERF_DATA_MODE_WRITE,
+		.path = path,
+		.mode = PERF_DATA_MODE_WRITE,
 	};
 
 	session = perf_session__new(&data, false, NULL);
@@ -63,10 +61,8 @@ static int check_cpu_topology(char *path, struct perf_cpu_map *map)
 {
 	struct perf_session *session;
 	struct perf_data data = {
-		.file      = {
-			.path = path,
-		},
-		.mode      = PERF_DATA_MODE_READ,
+		.path = path,
+		.mode = PERF_DATA_MODE_READ,
 	};
 	int i;
 
-- 
2.25.3