Re: cgroup/cgroup_core03: convert to new LTP API with parameterised subtests

Hi Yeswanth,

On Fri, 31 Jul 2026, Yeswanth Krishna Tellakula wrote:
> cgroup/cgroup_core03: convert to new LTP API with parameterised subtests

> static void run(unsigned int n)
> {
> 	int i;
>
> 	/* Fork wave: only needed before the first subtest. */
> 	if (n == 0) {
> 		*data_ptr = 0;
> 		num_pids = PID_NUM;
>
> 		for (i = 0; i < num_pids; i++)
> 			pids[i] = cg_run_nowait(cg_child);
>
> 		TST_CHECKPOINT_WAIT(0);
> 	}
>
> 	switch (n) {
> 	case 0:
> 		test_cg_kill_procs_count();
> 		break;
> 	case 1:
> 		test_cg_kill_trigger();

Critical: Could these dependent stages remain in one .test_all callback?
After run(0) returns, run_tests() unconditionally calls
tst_reap_children(). That blocks in wait() because every child is paused,
while cgroup.kill is not written until run(1). Consequently run(1) is never
reached and the test times out.

> /*\
>  * [Description]

Minor: Could the deprecated [Description] header be removed? Introductory
prose is already treated as the description, and this header is forbidden in
new C test documentation.

> 	.needs_root = 1,

Minor: Could the high-level description explain why root is required? The
new root-only requirement is not documented as required by the root-usage
rule.

> No functional behaviour change.

Minor: Could this claim be removed? The patch adds root-only gating and
kernel-taint failure checking, changes the timeout, and changes result
reporting, so it changes observable behavior even apart from the hang above.

Verdict - Needs revision

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