linux-kernel - Re: [PATCH] selftests/cgroup: conform test to TAP format output

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Message-ID: <4h54pkcisk5fmevglu3qldk5fb2rgo5355vfds3wplhekfumtz@qtwtixmuw2hz>
Date: Fri, 14 Nov 2025 15:32:34 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Guopeng Zhang <zhangguopeng@...inos.cn>
Cc: tj@...nel.org, hannes@...xchg.org, shuah@...nel.org, 
	cgroups@...r.kernel.org, linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, 
	sebastian.chlad@...e.com, longman@...hat.com
Subject: Re: [PATCH] selftests/cgroup: conform test to TAP format output

On Fri, Nov 14, 2025 at 11:55:48AM +0800, Guopeng Zhang <zhangguopeng@...inos.cn> wrote:
> Actually, selftests are no longer just something for developers to view locally; they are now extensively 
> run in CI and stable branch regression testing. Using a standardized layout means that general test runners 
> and CI systems can parse the cgroup test results without any special handling.

Nice. I appreciate you took this up.

> This patch is not part of a formal, tree-wide conversion series I am running; it is an incremental step to align the 
> cgroup C tests with the existing TAP usage. I started here because these tests already use ksft_test_result_*() and 
> only require minor changes to generate proper TAP output.

The tests are in various state of usage, correctness and usefulness,
hence...

> 
> > I'm asking to better asses whether also the scripts listed in
> > Makefile:TEST_PROGS should be converted too.
> 
> I agree that having them produce TAP output would benefit tooling and CI. I did not want to mix 
> that into this change, but if you and other maintainers think this direction is reasonable, 
> I would be happy to follow up and convert the cgroup shell tests to TAP as well.

...I'd suggest next focus on test_cpuset_prs.sh (as discussed, it may
need more changes to adapt its output too).

Michal

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