[LTP] [PATCHv2] listmount04.c: update struct mnt_id_req support to kernel >= 6.17.9

[Petr Vorel]

Hi Po-Hsu Lin,

> The kernel change 78f0e33cd6c93 ("fs/namespace: correctly handle errors
> returned by grab_requested_mnt_ns") from 6.18 has been ported to upstream
> 6.17.9 [1][2].

> Therefore change the expectation from >= 6.18 to >= 6.17.9 accodingly.

> [1] https://lwn.net/Articles/1047684/
> [2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.17.9&id=8ff97ade

> v2: add comments for this change into the code.

> Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
> ---
>  .../kernel/syscalls/listmount/listmount04.c    | 18 +++++++++++-------
>  1 file changed, 11 insertions(+), 7 deletions(-)

> diff --git a/testcases/kernel/syscalls/listmount/listmount04.c b/testcases/kernel/syscalls/listmount/listmount04.c
> index 2b8b49101..59da46cfd 100644
> --- a/testcases/kernel/syscalls/listmount/listmount04.c
> +++ b/testcases/kernel/syscalls/listmount/listmount04.c
> @@ -7,6 +7,10 @@
>   * Verify that listmount() raises the correct errors according with
>   * invalid data:
>   *
> + * - EBADF: invalid mnt_ns_fd
> + * This check was introduced for kernel commit 78f0e33cd6c9 ("fs/namespace:
> + * correctly handle errors returned by grab_requested_mnt_ns") introduced
> + * in v6.18-rc7 and backported to v6.17.9.

TL;DR
Please either fix RST syntax or move text outside /*\ section.

IMHO this is an implementation detail, I don't think we need it in the test
catalog docs [1]. I would just put this comment above macro definition: #define
BEFORE_6_17_9 1.

Also this is a wrong RST syntax. FYI we parse this into sphinx docs [1] and
this breaks formatting of the list:

* EBADF: invalid mnt_ns_fd

This check was introduced for kernel commit 78f0e33cd6c9 (“fs/namespace: correctly handle errors returned by grab_requested_mnt_ns”) introduced in v6.18-rc7 and backported to v6.17.9. - EFAULT: req or mnt_id are unaccessible memories - EINVAL: invalid flags or mnt_id request - ENOENT: non-existent mount point

If you run:
$ cd doc; make setup && make

you'll get local build of the documentation, see ./html/users/test_catalog.html#listmount04

Kind regards,
Petr

[1] file:///home/pevik/install/src/ltp.git/doc/html/users/test_catalog.html#listmount04