[PATCH] perf tests: Fix false TEST_OK result for 'perf test hist'
From: Wang Nan
Date: Mon Dec 14 2015 - 23:19:44 EST
Commit 71d6de64feddd4b455555326fba2111b3006d9e0 ('perf test: Fix hist
testcases when kptr_restrict is on') solves a double free problem when
'perf test hist' calling setup_fake_machine(). However, the result is
still incorrect. For example:
$ ./perf test -v 'filtering hist entries'
25: Test filtering hist entries :
--- start ---
test child forked, pid 4186
Cannot create kernel maps
test child finished with 0
---- end ----
Test filtering hist entries: Ok
In this case the body of this test is not get executed at all, but the
result is 'Ok'. I think 'Skip' should be better.
The reason is that *ALL* hists test cases forget to reset err after
using it to hold an error code.
This patch ensure err is reset.
In case when kptr_restrict prevent normal user get kernel address, this
test should be skipped, not fail. This patch uses linux/err.h to store
error code in return value of setup_fake_machine(), and let 'EACCES' to
indicate this problem.
Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
---
tools/perf/tests/hists_common.c | 12 +++++++++---
tools/perf/tests/hists_common.h | 1 +
tools/perf/tests/hists_cumulate.c | 6 +++++-
tools/perf/tests/hists_filter.c | 6 +++++-
tools/perf/tests/hists_link.c | 6 +++++-
tools/perf/tests/hists_output.c | 6 +++++-
6 files changed, 30 insertions(+), 7 deletions(-)
diff --git a/tools/perf/tests/hists_common.c b/tools/perf/tests/hists_common.c
index bcfd081..2eca1b2 100644
--- a/tools/perf/tests/hists_common.c
+++ b/tools/perf/tests/hists_common.c
@@ -81,15 +81,20 @@ struct machine *setup_fake_machine(struct machines *machines)
{
struct machine *machine = machines__find(machines, HOST_KERNEL_ID);
size_t i;
+ int err = -ENOMEM;
if (machine == NULL) {
pr_debug("Not enough memory for machine setup\n");
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
if (machine__create_kernel_maps(machine)) {
pr_debug("Cannot create kernel maps\n");
- return NULL;
+ if (symbol_conf.kptr_restrict) {
+ pr_debug("Hint: Check /proc/sys/kernel/kptr_restrict.\n");
+ err = -EACCES;
+ }
+ return ERR_PTR(err);
}
for (i = 0; i < ARRAY_SIZE(fake_threads); i++) {
@@ -155,7 +160,8 @@ struct machine *setup_fake_machine(struct machines *machines)
out:
pr_debug("Not enough memory for machine setup\n");
machine__delete_threads(machine);
- return NULL;
+ machine__exit(machine);
+ return ERR_PTR(err);
}
void print_hists_in(struct hists *hists)
diff --git a/tools/perf/tests/hists_common.h b/tools/perf/tests/hists_common.h
index 888254e..0252eae 100644
--- a/tools/perf/tests/hists_common.h
+++ b/tools/perf/tests/hists_common.h
@@ -1,5 +1,6 @@
#ifndef __PERF_TESTS__HISTS_COMMON_H__
#define __PERF_TESTS__HISTS_COMMON_H__
+#include <linux/err.h>
struct machine;
struct machines;
diff --git a/tools/perf/tests/hists_cumulate.c b/tools/perf/tests/hists_cumulate.c
index 8292948..c211075 100644
--- a/tools/perf/tests/hists_cumulate.c
+++ b/tools/perf/tests/hists_cumulate.c
@@ -706,13 +706,17 @@ int test__hists_cumulate(int subtest __maybe_unused)
err = parse_events(evlist, "cpu-clock", NULL);
if (err)
goto out;
+ err = TEST_FAIL;
machines__init(&machines);
/* setup threads/dso/map/symbols also */
machine = setup_fake_machine(&machines);
- if (!machine)
+ if (IS_ERR(machine)) {
+ if (PTR_ERR(machine) == -EACCES)
+ err = TEST_SKIP;
goto out;
+ }
if (verbose > 1)
machine__fprintf(machine, stderr);
diff --git a/tools/perf/tests/hists_filter.c b/tools/perf/tests/hists_filter.c
index ccb5b49..795a04d 100644
--- a/tools/perf/tests/hists_filter.c
+++ b/tools/perf/tests/hists_filter.c
@@ -120,6 +120,7 @@ int test__hists_filter(int subtest __maybe_unused)
err = parse_events(evlist, "task-clock", NULL);
if (err)
goto out;
+ err = TEST_FAIL;
/* default sort order (comm,dso,sym) will be used */
if (setup_sorting() < 0)
@@ -129,8 +130,11 @@ int test__hists_filter(int subtest __maybe_unused)
/* setup threads/dso/map/symbols also */
machine = setup_fake_machine(&machines);
- if (!machine)
+ if (IS_ERR(machine)) {
+ if (PTR_ERR(machine) == -EACCES)
+ err = TEST_SKIP;
goto out;
+ }
if (verbose > 1)
machine__fprintf(machine, stderr);
diff --git a/tools/perf/tests/hists_link.c b/tools/perf/tests/hists_link.c
index 6243e2b..f5f37ef9 100644
--- a/tools/perf/tests/hists_link.c
+++ b/tools/perf/tests/hists_link.c
@@ -293,6 +293,7 @@ int test__hists_link(int subtest __maybe_unused)
if (err)
goto out;
+ err = TEST_FAIL;
/* default sort order (comm,dso,sym) will be used */
if (setup_sorting() < 0)
goto out;
@@ -301,8 +302,11 @@ int test__hists_link(int subtest __maybe_unused)
/* setup threads/dso/map/symbols also */
machine = setup_fake_machine(&machines);
- if (!machine)
+ if (IS_ERR(machine)) {
+ if (PTR_ERR(machine) == -EACCES)
+ err = TEST_SKIP;
goto out;
+ }
if (verbose > 1)
machine__fprintf(machine, stderr);
diff --git a/tools/perf/tests/hists_output.c b/tools/perf/tests/hists_output.c
index 248beec..cc570cf 100644
--- a/tools/perf/tests/hists_output.c
+++ b/tools/perf/tests/hists_output.c
@@ -597,13 +597,17 @@ int test__hists_output(int subtest __maybe_unused)
err = parse_events(evlist, "cpu-clock", NULL);
if (err)
goto out;
+ err = TEST_FAIL;
machines__init(&machines);
/* setup threads/dso/map/symbols also */
machine = setup_fake_machine(&machines);
- if (!machine)
+ if (IS_ERR(machine)) {
+ if (PTR_ERR(machine) == -EACCES)
+ err = TEST_SKIP;
goto out;
+ }
if (verbose > 1)
machine__fprintf(machine, stderr);
--
1.8.3.4
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