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Subject[PATCH tools/memory-model 3/4] tools/memory-order: Add documentation of new litmus test
The litmus-tests/README file lacks any mention of the new litmus test
ISA2+pooncelock+pooncelock+pombonce.litmus. This commit therefore
adds a description of this test.

Reported-by: Alan Stern <>
Signed-off-by: Paul E. McKenney <>
tools/memory-model/litmus-tests/README | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/tools/memory-model/litmus-tests/README b/tools/memory-model/litmus-tests/README
index dca7d823ad57..04096fb8b8d9 100644
--- a/tools/memory-model/litmus-tests/README
+++ b/tools/memory-model/litmus-tests/README
@@ -32,6 +32,12 @@ IRIW+poonceonces+OnceOnce.litmus
order of a pair of writes, where each write is to a different
variable by a different process?

+ Tests whether the ordering provided by a lock-protected S
+ litmus test is visible to an external process whose accesses are
+ separated by smp_mb(). This addition of an external process to
+ S is otherwise known as ISA2.
As below, but with store-release replaced with WRITE_ONCE()
and load-acquire replaced with READ_ONCE().
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