This commit adds a litmus test suggested by Alan Stern that is forbidden
on multicopy atomic systems, but allowed on non-multicopy atomic systems.
Note that other-multicopy atomic systems are examples of non-multicopy
atomic systems.
Suggested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
.../litmus-tests/SB+poonceoncescoh.litmus | 31 ++++++++++++++++++++++
1 file changed, 31 insertions(+)
create mode 100644 tools/memory-model/litmus-tests/SB+poonceoncescoh.litmus
diff --git a/tools/memory-model/litmus-tests/SB+poonceoncescoh.litmus b/tools/memory-model/litmus-tests/SB+poonceoncescoh.litmus
new file mode 100644
index 000000000000..991a2d6dec63
--- /dev/null
+++ b/tools/memory-model/litmus-tests/SB+poonceoncescoh.litmus
@@ -0,0 +1,31 @@
+C SB+poonceoncescoh
+
+(*
+ * Result: Sometimes
+ *
+ * This litmus test demonstrates that LKMM is not multicopy atomic.
+ *)
+
+{}
+
+P0(int *x, int *y)
+{
+ int r1;
+ int r2;
+
+ WRITE_ONCE(*x, 1);
+ r1 = READ_ONCE(*x);
+ r2 = READ_ONCE(*y);
+}
+
+P1(int *x, int *y)
+{
+ int r3;
+ int r4;
+
+ WRITE_ONCE(*y, 1);
+ r3 = READ_ONCE(*y);
+ r4 = READ_ONCE(*x);
+}
+
+exists (0:r2=0 /\ 1:r4=0 /\ 0:r1=1 /\ 1:r3=1)
--
2.5.2
