Use a filter function to skip the time namespace test on systems with
!CONFIG_TIME_NS. This reworks a fix originally done by Tiezhu Yang prior
to the refactoring in 34dce23f7e40 ("selftests/clone3: Report descriptive
test names"). The changelog from their fix explains the issue very clearly:
When execute the following command to test clone3 under !CONFIG_TIME_NS:
# make headers && cd tools/testing/selftests/clone3 && make && ./clone3
we can see the following error info:
# [7538] Trying clone3() with flags 0x80 (size 0)
# Invalid argument - Failed to create new process
# [7538] clone3() with flags says: -22 expected 0
not ok 18 [7538] Result (-22) is different than expected (0)
...
# Totals: pass:18 fail:1 xfail:0 xpass:0 skip:0 error:0
This is because if CONFIG_TIME_NS is not set, but the flag
CLONE_NEWTIME (0x80) is used to clone a time namespace, it
will return -EINVAL in copy_time_ns().
If kernel does not support CONFIG_TIME_NS, /proc/self/ns/time
will be not exist, and then we should skip clone3() test with
CLONE_NEWTIME.
With this patch under !CONFIG_TIME_NS:
# make headers && cd tools/testing/selftests/clone3 && make && ./clone3
...
# Time namespaces are not supported
ok 18 # SKIP Skipping clone3() with CLONE_NEWTIME
...
# Totals: pass:18 fail:0 xfail:0 xpass:0 skip:1 error:0
Fixes: 515bddf0ec41 ("selftests/clone3: test clone3 with CLONE_NEWTIME")
Suggested-by: Thomas Gleixner <[email protected]>
Original-fix-from: Tiezhu Yang <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
---
tools/testing/selftests/clone3/clone3.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/tools/testing/selftests/clone3/clone3.c
b/tools/testing/selftests/clone3/clone3.c
index 9429d361059e..915846bc32cc 100644
--- a/tools/testing/selftests/clone3/clone3.c
+++ b/tools/testing/selftests/clone3/clone3.c
@@ -138,6 +138,16 @@ static bool not_root(void)
return false;
}
+static bool timens_unsupported(void)
+{
+ if (access("/proc/self/ns/time", F_OK) == 0) {
+ ksft_print_msg("Time namespaces are not supported\n");
+ return true;
+ }
+
+ return false;
+}
+
static size_t page_size_plus_8(void)
{
return getpagesize() + 8;
@@ -282,6 +292,7 @@ static const struct test tests[] = {
.size = 0,
.expected = 0,
.test_mode = CLONE3_ARGS_NO_TEST,
+ .filter = timens_unsupported,
},
{
.name = "exit signal (SIGCHLD) in flags",
---
base-commit: 8d4099dd0727acfc8b0f644eacaf852f9d5dc649
change-id: 20231019-kselftest-clone3-time-ns-730b6f4187c7
Best regards,
--
Mark Brown <[email protected]>
