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 
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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