[LTP] [PATCHv4] 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 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.
> v3: correct the RST syntax and move comment as suggested by Petr Vorel.
> v4: correct the patch title.

Thank you, LGTM now.
Reviewed-by: Petr Vorel <pvorel@suse.cz>

Kind regards,
Petr

> Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
> ---
>  .../kernel/syscalls/listmount/listmount04.c   | 19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)

> diff --git a/testcases/kernel/syscalls/listmount/listmount04.c b/testcases/kernel/syscalls/listmount/listmount04.c
> index 2b8b49101..919f4c854 100644
> --- a/testcases/kernel/syscalls/listmount/listmount04.c
> +++ b/testcases/kernel/syscalls/listmount/listmount04.c
> @@ -7,6 +7,7 @@
>   * Verify that listmount() raises the correct errors according with
>   * invalid data:
>   *
> + * - EBADF: invalid mnt_ns_fd
>   * - EFAULT: req or mnt_id are unaccessible memories
>   * - EINVAL: invalid flags or mnt_id request
>   * - ENOENT: non-existent mount point
> @@ -20,8 +21,12 @@
>  #include "lapi/syscalls.h"

>  #define MNT_SIZE 32
> -#define BEFORE_6_18 1
> -#define AFTER_6_18 2
> +/*
> + * For commit 78f0e33cd6c9 ("fs/namespace: correctly handle errors returned
> + * by grab_requested_mnt_ns") from v6.18-rc7 backported to v6.17.9.
> + */
> +#define BEFORE_6_17_9 1
> +#define AFTER_6_17_9 2

>  static mnt_id_req *request;
>  static uint64_t mnt_ids[MNT_SIZE];
> @@ -84,7 +89,7 @@ static struct tcase {
>  		.nr_mnt_ids = MNT_SIZE,
>  		.exp_errno = EINVAL,
>  		.msg = "invalid mnt_id_req.spare",
> -		.kver = BEFORE_6_18,
> +		.kver = BEFORE_6_17_9,
>  	},
>  	{
>  		.req_usage = 1,
> @@ -95,7 +100,7 @@ static struct tcase {
>  		.nr_mnt_ids = MNT_SIZE,
>  		.exp_errno = EBADF,
>  		.msg = "invalid mnt_id_req.mnt_ns_fd",
> -		.kver = AFTER_6_18,
> +		.kver = AFTER_6_17_9,
>  	},
>  	{
>  		.req_usage = 1,
> @@ -154,10 +159,10 @@ static void run(unsigned int n)

>  static void setup(void)
>  {
> -	if (tst_kvercmp(6, 18, 0) >= 0)
> -		kver = AFTER_6_18;
> +	if (tst_kvercmp(6, 17, 9) >= 0)
> +		kver = AFTER_6_17_9;
>  	else
> -		kver = BEFORE_6_18;
> +		kver = BEFORE_6_17_9;
>  }

>  static struct tst_test test = {