On 06/09/2023 05:07 PM, Tiezhu Yang wrote:

When execute the following command to test clone3 on LoongArch:

# cd tools/testing/selftests/clone3 && make && ./clone3

we can see the following error info:

# [5719] Trying clone3() with flags 0x80 (size 0) # Invalid argument - Failed to create new process # [5719] clone3() with flags says: -22 expected 0 not ok 18 [5719] Result (-22) is different than expected (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:

# cd tools/testing/selftests/clone3 && make && ./clone3 ... # Time namespaces are not supported ok 18 # SKIP Skipping clone3() with CLONE_NEWTIME # Totals: pass:17 fail:0 xfail:0 xpass:0 skip:1 error:0

Fixes: 515bddf0ec41 ("selftests/clone3: test clone3 with CLONE_NEWTIME") Suggested-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Tiezhu Yang yangtiezhu@loongson.cn

---

v5: -- Rebase on the next branch of shuah/linux-kselftest.git to avoid potential merge conflicts due to changes in the link: https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/co... -- Update the commit message and send it as a single patch

Here is the v4 patch: https://lore.kernel.org/loongarch/1685968410-5412-2-git-send-email-yangtiezh...

tools/testing/selftests/clone3/clone3.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/clone3/clone3.c b/tools/testing/selftests/clone3/clone3.c index e60cf4d..1c61e3c 100644 --- a/tools/testing/selftests/clone3/clone3.c +++ b/tools/testing/selftests/clone3/clone3.c @@ -196,7 +196,12 @@ int main(int argc, char *argv[]) CLONE3_ARGS_NO_TEST);

/* Do a clone3() in a new time namespace */

• test_clone3(CLONE_NEWTIME, 0, 0, CLONE3_ARGS_NO_TEST);

• if (access("/proc/self/ns/time", F_OK) == 0) {

• test_clone3(CLONE_NEWTIME, 0, 0, CLONE3_ARGS_NO_TEST);
  

• } else {

• ksft_print_msg("Time namespaces are not supported\n");
  

• ksft_test_result_skip("Skipping clone3() with CLONE_NEWTIME\n");
  

• }

  /* Do a clone3() with exit signal (SIGCHLD) in flags */ test_clone3(SIGCHLD, 0, -EINVAL, CLONE3_ARGS_NO_TEST);

Ping. Any more comments?

Thanks, Tiezhu