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Subject[PATCH RFC tools/memory-model] Add s390.{cfg,cat}

The prototype patch shown below provides files required to allow herd7 to
evaluate C-language litmus tests for the multicopy-atomic TSO ordering
provided by s390. This patch should be viewed with great suspicion.
It does what I expect it to do on SB (with and without barriers),
IRIW without barriers, and Alan's SB with read-of-write added, but my
expectations are quite likely faulty, and my test cases are very few
in number.

Either way, this is the easy part. The hard part (which I am happy
to leave to others) is making litmus7 and klitmus7 able to do tests
on actual hardware, as well as enabling herd to handle litmus tests
containing BAL. ;-)

Note that CPU architectures already supported by herd might well need
only a .cfg file that refers to herd's pre-existing support.


Thanx, Paul


commit 2fff0ff161b71215e7f7292b9eff4bc77ba64f29
Author: Paul E. McKenney <>
Date: Wed Mar 28 06:30:39 2018 -0700

tools/memory-model: Add .cfg and .cat files for s390

This commit adds and s390.cfg files to allow users to check
litmus tests for s390-specific code. Note that this change only enables
herd7 checking of C-language litmus tests. Larger changes are required
to enable the litmus7 and klitmus7 tools to check litmus tests on real

Suggested-by: Martin Schwidefsky <>
Suggested-by: Christian Borntraeger <>
Signed-off-by: Paul E. McKenney <>

diff --git a/tools/memory-model/ b/tools/memory-model/
new file mode 100644
index 000000000000..618e88f50d9a
--- /dev/null
+++ b/tools/memory-model/
@@ -0,0 +1,12 @@
+include ""
+include ""
+(* Atomic *)
+empty rmw & (fre;coe) as atom
+(* TSO with multicopy atomicity *)
+acyclic (po \ (W * R)) | po-loc | fr | rf | co as sc
+(* Fences are somehow handled implicitly, at least for SB+mb... *)
diff --git a/tools/memory-model/s390.cfg b/tools/memory-model/s390.cfg
new file mode 100644
index 000000000000..d77e05d2395c
--- /dev/null
+++ b/tools/memory-model/s390.cfg
@@ -0,0 +1,21 @@
+macros linux-kernel.def
+bell linux-kernel.bell
+graph columns
+squished true
+showevents noregs
+movelabel true
+fontsize 8
+xscale 2.0
+yscale 1.5
+arrowsize 0.8
+showinitrf false
+showfinalrf false
+showinitwrites false
+splines spline
+pad 0.1
+edgeattr hb,color,indigo
+edgeattr co,color,blue
+edgeattr mb,color,darkgreen
+edgeattr wmb,color,darkgreen
+edgeattr rmb,color,darkgreen
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