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SubjectRe: [PATCH v6] selftests/clone3: Fix broken test under !CONFIG_TIME_NS
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Hi Shuah,

On 07/11/2023 05:13 PM, Tiezhu Yang wrote:
> 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 <tglx@linutronix.de>
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
>
> v6: Rebase on 6.5-rc1 and update the commit message
>
> tools/testing/selftests/clone3/clone3.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>

Hi Shuah,

Any comments? I guess this should go through the linux-kselftest tree.

Thanks,
Tiezhu

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