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This commit cites a pertinent RCU-related litmus test. Co-developed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Co-developed-by: Akira Yokosawa <akiyks@gmail.com> [Alan: grammar nit] [ paulmck: Update commit log and title per Akira feedback. ] Suggested-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Akira Yokosawa <akiyks@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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============
LITMUS TESTS
============
Each subdirectory contains litmus tests that are typical to describe the
semantics of respective kernel APIs.
For more information about how to "run" a litmus test or how to generate
a kernel test module based on a litmus test, please see
tools/memory-model/README.
atomic (/atomic derectory)
--------------------------
Atomic-RMW+mb__after_atomic-is-stronger-than-acquire.litmus
Test that an atomic RMW followed by a smp_mb__after_atomic() is
stronger than a normal acquire: both the read and write parts of
the RMW are ordered before the subsequential memory accesses.
Atomic-RMW-ops-are-atomic-WRT-atomic_set.litmus
Test that atomic_set() cannot break the atomicity of atomic RMWs.
RCU (/rcu directory)
--------------------
MP+onceassign+derefonce.litmus (under tools/memory-model/litmus-tests/)
Demonstrates the use of rcu_assign_pointer() and rcu_dereference() to
ensure that an RCU reader will not see pre-initialization garbage.
RCU+sync+read.litmus
RCU+sync+free.litmus
Both the above litmus tests demonstrate the RCU grace period guarantee
that an RCU read-side critical section can never span a grace period.