A recent discussion raises up the requirement for having test cases for atomic APIs: https://lore.kernel.org/lkml/20200213085849.GL14897@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ , and since we already have a way to generate a test module from a litmus test with klitmus[1]. It makes sense that we add more litmus tests for atomic APIs. And based on the previous discussion, I create a new directory Documentation/atomic-tests and put these litmus tests here. This patchset starts the work by adding the litmus tests which are already used in atomic_t.txt, and also improve the atomic_t.txt to make it consistent with the litmus tests. Previous version: v1: https://lore.kernel.org/linux-doc/20200214040132.91934-1-boqun.feng@xxxxxxxxx/ Changes since v1: * Move the tests into Documentation/atomic-tests directory as a result of the discussion with Alan and Paul. * Word changing on litmus test names and other sentences in documents based on Alan's suggestion. * Add local variable declarations in Atomic-RMW+mb__after_atomic-is-stronger-than-acquire to make klitmus work as per Andrea's suggestion. Currently, I haven't heard anything from Luc on whether the atomic_add_unless() works or not for the LKMM, but based on my test and Andrea's previous test, I think it actually works. I will add the corresponding changes to the LIMITATIONS part of LKMM document if I got a comfirm from Luc. And my PR: https://github.com/herd/herdtools7/pull/28 is still not merged. So this version is simply an RFC and comments and suggesions are welcome! Regards, Boqun [1]: http://diy.inria.fr/doc/litmus.html#klitmus Boqun Feng (4): Documentation/locking/atomic: Fix atomic-set litmus test Documentation/locking/atomic: Introduce atomic-tests directory Documentation/locking/atomic: Add a litmus test for atomic_set() Documentation/locking/atomic: Add a litmus test smp_mb__after_atomic() ...ter_atomic-is-stronger-than-acquire.litmus | 32 +++++++++++++++++++ ...c-RMW-ops-are-atomic-WRT-atomic_set.litmus | 24 ++++++++++++++ Documentation/atomic-tests/README | 16 ++++++++++ Documentation/atomic_t.txt | 24 +++++++------- MAINTAINERS | 1 + 5 files changed, 85 insertions(+), 12 deletions(-) create mode 100644 Documentation/atomic-tests/Atomic-RMW+mb__after_atomic-is-stronger-than-acquire.litmus create mode 100644 Documentation/atomic-tests/Atomic-RMW-ops-are-atomic-WRT-atomic_set.litmus create mode 100644 Documentation/atomic-tests/README -- 2.25.0
