[LTP] testcases: sysfs: Add sys_thp02

[linuxtestproject.agent@gmail.com]

Hi Xuewen,

On Thu, Nov 5, 2026 at 6:46 PM, Xuewen Wang <wangxuewen@kylinos.cn> wrote:
> testcases: sysfs: Add sys_thp02

> +/*\
> + * Sanity checks for the multi-size Transparent HugePage (mTHP) attributes
> + * exported under /sys/kernel/mm/transparent_hugepage/hugepages-*kB/.

The unescaped '*kB' after '-' in the reStructuredText doc comment is parsed
as an unclosed emphasis start-string. Use 'hugepages-<size>kB/' (matching the
next paragraph) or wrap the path in double backticks.

> +	if (is_anon)
> +		TST_SYSFS_ASSERT_CHOICE(enabled_allowed, NULL, 0,
> +					PATH_MM_THP "/%s/enabled", dir);
> +
> +	if (is_shmem)
> +		TST_SYSFS_ASSERT_CHOICE(shmem_allowed, NULL, 0,
> +					PATH_MM_THP "/%s/shmem_enabled", dir);
> +
> +	for (i = 0; any_stats[i]; i++) {
> +		TST_SYSFS_ASSERT_RANGEUU_SILENT(0, ULONG_MAX,
> +						PATH_MM_THP "/%s/stats/%s",
> +						dir, any_stats[i]);
> +	}
> +
> +	if (is_anon) {

These two 'if' statements have multi-line bodies without curly braces and
duplicate the 'if (is_anon)' and 'if (is_shmem)' blocks immediately below.
Move the TST_SYSFS_ASSERT_CHOICE() calls into the braced 'if (is_anon)' and
'if (is_shmem)' blocks below (or add curly braces).

> +static void run(void)
> +{
> +	DIR *d;
> +	struct dirent *ent;
> +	int found = 0;
> +
> +	d = TST_SYSFS_TRY_OPENDIR(PATH_MM_THP);

'found_pmd' is a file-scope static variable that is set to 1 in check_size()
and never reset at the start of run(), so it stays set across '-i'
iterations. Reset 'found_pmd = 0;' at the beginning of run().

Verdict - Needs revision

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