README
1============
2LITMUS TESTS
3============
4
5Each subdirectory contains litmus tests that are typical to describe the
6semantics of respective kernel APIs.
7For more information about how to "run" a litmus test or how to generate
8a kernel test module based on a litmus test, please see
9tools/memory-model/README.
10
11
12atomic (/atomic directory)
13--------------------------
14
15Atomic-RMW+mb__after_atomic-is-stronger-than-acquire.litmus
16 Test that an atomic RMW followed by a smp_mb__after_atomic() is
17 stronger than a normal acquire: both the read and write parts of
18 the RMW are ordered before the subsequential memory accesses.
19
20Atomic-RMW-ops-are-atomic-WRT-atomic_set.litmus
21 Test that atomic_set() cannot break the atomicity of atomic RMWs.
22 NOTE: Require herd7 7.56 or later which supports "(void)expr".
23
24
25RCU (/rcu directory)
26--------------------
27
28MP+onceassign+derefonce.litmus (under tools/memory-model/litmus-tests/)
29 Demonstrates the use of rcu_assign_pointer() and rcu_dereference() to
30 ensure that an RCU reader will not see pre-initialization garbage.
31
32RCU+sync+read.litmus
33RCU+sync+free.litmus
34 Both the above litmus tests demonstrate the RCU grace period guarantee
35 that an RCU read-side critical section can never span a grace period.
36