linux-kernel - Re: [PATCH v4] kselftest: Add basic test for probing the rust sample modules

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Date: Tue, 27 Feb 2024 17:01:50 -0700
From: Shuah Khan <skhan@...uxfoundation.org>
To: Laura Nao <laura.nao@...labora.com>, ojeda@...nel.org,
 alex.gaynor@...il.com, wedsonaf@...il.com, shuah@...nel.org
Cc: usama.anjum@...labora.com, a.hindborg@...sung.com, aliceryhl@...gle.com,
 benno.lossin@...ton.me, bjorn3_gh@...tonmail.com, boqun.feng@...il.com,
 gary@...yguo.net, kernel@...labora.com, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org, rust-for-linux@...r.kernel.org,
 kernel@...entinobst.de, Sergio Gonzalez Collado <sergio.collado@...il.com>,
 Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v4] kselftest: Add basic test for probing the rust sample
 modules

Hi Laura,

On 2/26/24 03:16, Laura Nao wrote:
> Add new basic kselftest that checks if the available rust sample modules
> can be added and removed correctly.
> 
> Signed-off-by: Laura Nao <laura.nao@...labora.com>
> Reviewed-by: Sergio Gonzalez Collado <sergio.collado@...il.com>
> Reviewed-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
> Depends on:
> - https://lore.kernel.org/all/20240102141528.169947-1-laura.nao@collabora.com/T/#u
> - https://lore.kernel.org/all/20240131-ktap-sh-helpers-extend-v1-0-98ffb468712c@collabora.com/
> Changes in v4:
> - Added config file
> Changes in v3:
> - Removed useless KSFT_PASS, KSFT_FAIL, KSFT_SKIP constants
> - Used ktap_finished to print the results summary and handle the return code
> Changes in v2:
> - Added missing SPDX line
> - Edited test_probe_samples.sh script to use the common KTAP helpers file
> ---
>   MAINTAINERS                                   |  1 +
>   tools/testing/selftests/Makefile              |  1 +
>   tools/testing/selftests/rust/Makefile         |  4 +++
>   tools/testing/selftests/rust/config           |  5 +++
>   .../selftests/rust/test_probe_samples.sh      | 34 +++++++++++++++++++
>   5 files changed, 45 insertions(+)
>   create mode 100644 tools/testing/selftests/rust/Makefile
>   create mode 100644 tools/testing/selftests/rust/config
>   create mode 100755 tools/testing/selftests/rust/test_probe_samples.sh
> 

I ran test again and I still see the same. I would like to
see the script to handle error conditions.

> diff --git a/MAINTAINERS b/MAINTAINERS
>
> +
> +DIR="$(dirname "$(readlink -f "$0")")"
> +
> +source "${DIR}"/../kselftest/ktap_helpers.sh

It tries to source and keeps going. Why can't we test for
the file to exist and skip gracefully without printing
the following messages.

  ./test_probe_samples.sh: line 12: /linux/linux_6.8/tools/testing/selftests/rust/../kselftest/ktap_helpers.sh: No such file or director
# ./test_probe_samples.sh: line 16: ktap_print_header: command not found
# ./test_probe_samples.sh: line 18: ktap_set_plan: command not found
# ./test_probe_samples.sh: line 22: ktap_test_skip: command not found
# ./test_probe_samples.sh: line 22: ktap_test_skip: command not found
# ./test_probe_samples.sh: line 34: ktap_finished: command not found



not ok 1 selftests: rust: test_probe_samples.sh # exit=127


> +
> +rust_sample_modules=("rust_minimal" "rust_print")
> +
> +ktap_print_header
> +
> +ktap_set_plan "${#rust_sample_modules[@]}"
> +
> +for sample in "${rust_sample_modules[@]}"; do
> +    if ! /sbin/modprobe -n -q "$sample"; then
> +        ktap_test_skip "module $sample is not found in /lib/modules/$(uname -r)"
> +        continue

Why are we continuing here? Isn't this skip condition?

> +    fi
> +
> +    if /sbin/modprobe -q "$sample"; then
> +        /sbin/modprobe -q -r "$sample"
> +        ktap_test_pass "$sample"
> +    else
> +        ktap_test_fail "$sample"
> +    fi
> +done
> +
> +ktap_finished


I would like to see the test exit with skip code when RUST isn't
enabled. Please refer to existing tests that do this properly.

thanks,
-- Shuah