Update to add clarity and recommendations on running newer kselftests on older kernels vs. matching the kernel and kselftest revisions.

The recommendation is "Match kernel revision and kselftest."

Signed-off-by: Shuah Khan skhan@linuxfoundation.org --- Documentation/dev-tools/kselftest.rst | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)

diff --git a/Documentation/dev-tools/kselftest.rst b/Documentation/dev-tools/kselftest.rst index 25604904fa6e..e55d9229fa8c 100644 --- a/Documentation/dev-tools/kselftest.rst +++ b/Documentation/dev-tools/kselftest.rst @@ -12,6 +12,31 @@ write new tests using the framework on Kselftest wiki:

https://kselftest.wiki.kernel.org/

+Recommendations on running kselftests in Continuous Integration test rings +========================================================================= + +It is recommended that users run Kselftest from the same release. Running +newer Kselftest on older kernels isn't recommended for the following +reasons: + +- Kselftest from mainline and linux-next might not be stable enough to run + on stable kernels. +- Kselftests detect feature dependencies at run-time and skip tests if a + feature and/or configuration they test aren't enabled. Running newer + tests on older kernels could result in a few too many skipped/failed + conditions. It becomes difficult to evaluate the results. +- Newer tests provide better coverage. However, users should make a judgement + call on coverage vs. run to run consistency and being able to compare + run to run results on older kernels. + +Recommendations: + +Match kernel revision and kselftest. Especially important for LTS and +Stable kernel Continuous Integration test rings. + +Hot-plug tests +============== + On some systems, hot-plug tests could hang forever waiting for cpu and memory to be ready to be offlined. A special hot-plug target is created to run the full range of hot-plug tests. In default mode, hot-plug tests run