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Date: Tue, 29 May 2018 14:20:13 +0200
From: Andrea Parri <andrea.parri@...rulasolutions.com>
To: linux-kernel@...r.kernel.org
Cc: Andrea Parri <andrea.parri@...rulasolutions.com>,
Alan Stern <stern@...land.harvard.edu>,
Will Deacon <will.deacon@....com>,
Peter Zijlstra <peterz@...radead.org>,
Boqun Feng <boqun.feng@...il.com>,
Nicholas Piggin <npiggin@...il.com>,
David Howells <dhowells@...hat.com>,
Jade Alglave <j.alglave@....ac.uk>,
Luc Maranget <luc.maranget@...ia.fr>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Akira Yokosawa <akiyks@...il.com>
Subject: [PATCH] tools/memory-model: Rename litmus tests to comply to norm7
norm7 produces the 'normalized' name of a litmus test, when the test
can be generated from a single cycle that passes through each process
exactly once. The commit renames such tests in order to comply to the
naming scheme implemented by this tool.
Signed-off-by: Andrea Parri <andrea.parri@...rulasolutions.com>
Cc: Alan Stern <stern@...land.harvard.edu>
Cc: Will Deacon <will.deacon@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: David Howells <dhowells@...hat.com>
Cc: Jade Alglave <j.alglave@....ac.uk>
Cc: Luc Maranget <luc.maranget@...ia.fr>
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: Akira Yokosawa <akiyks@...il.com>
---
tools/memory-model/Documentation/recipes.txt | 8 ++--
tools/memory-model/README | 20 +++++-----
.../IRIW+fencembonceonces+OnceOnce.litmus | 45 ++++++++++++++++++++++
.../litmus-tests/IRIW+mbonceonces+OnceOnce.litmus | 45 ----------------------
.../litmus-tests/LB+ctrlonceonce+mbonceonce.litmus | 34 ----------------
.../LB+fencembonceonce+ctrlonceonce.litmus | 34 ++++++++++++++++
.../MP+fencewmbonceonce+fencermbonceonce.litmus | 30 +++++++++++++++
.../litmus-tests/MP+wmbonceonce+rmbonceonce.litmus | 30 ---------------
.../litmus-tests/R+fencembonceonces.litmus | 30 +++++++++++++++
.../memory-model/litmus-tests/R+mbonceonces.litmus | 30 ---------------
tools/memory-model/litmus-tests/README | 16 ++++----
.../S+fencewmbonceonce+poacquireonce.litmus | 27 +++++++++++++
.../S+wmbonceonce+poacquireonce.litmus | 27 -------------
.../litmus-tests/SB+fencembonceonces.litmus | 32 +++++++++++++++
.../litmus-tests/SB+mbonceonces.litmus | 32 ---------------
.../WRC+pooncerelease+fencermbonceonce+Once.litmus | 38 ++++++++++++++++++
.../WRC+pooncerelease+rmbonceonce+Once.litmus | 38 ------------------
...release+poacquirerelease+fencembonceonce.litmus | 42 ++++++++++++++++++++
...ooncerelease+poacquirerelease+mbonceonce.litmus | 42 --------------------
19 files changed, 300 insertions(+), 300 deletions(-)
create mode 100644 tools/memory-model/litmus-tests/IRIW+fencembonceonces+OnceOnce.litmus
delete mode 100644 tools/memory-model/litmus-tests/IRIW+mbonceonces+OnceOnce.litmus
delete mode 100644 tools/memory-model/litmus-tests/LB+ctrlonceonce+mbonceonce.litmus
create mode 100644 tools/memory-model/litmus-tests/LB+fencembonceonce+ctrlonceonce.litmus
create mode 100644 tools/memory-model/litmus-tests/MP+fencewmbonceonce+fencermbonceonce.litmus
delete mode 100644 tools/memory-model/litmus-tests/MP+wmbonceonce+rmbonceonce.litmus
create mode 100644 tools/memory-model/litmus-tests/R+fencembonceonces.litmus
delete mode 100644 tools/memory-model/litmus-tests/R+mbonceonces.litmus
create mode 100644 tools/memory-model/litmus-tests/S+fencewmbonceonce+poacquireonce.litmus
delete mode 100644 tools/memory-model/litmus-tests/S+wmbonceonce+poacquireonce.litmus
create mode 100644 tools/memory-model/litmus-tests/SB+fencembonceonces.litmus
delete mode 100644 tools/memory-model/litmus-tests/SB+mbonceonces.litmus
create mode 100644 tools/memory-model/litmus-tests/WRC+pooncerelease+fencermbonceonce+Once.litmus
delete mode 100644 tools/memory-model/litmus-tests/WRC+pooncerelease+rmbonceonce+Once.litmus
create mode 100644 tools/memory-model/litmus-tests/Z6.0+pooncerelease+poacquirerelease+fencembonceonce.litmus
delete mode 100644 tools/memory-model/litmus-tests/Z6.0+pooncerelease+poacquirerelease+mbonceonce.litmus
diff --git a/tools/memory-model/Documentation/recipes.txt b/tools/memory-model/Documentation/recipes.txt
index ee4309a87fc45..a40802fa1099e 100644
--- a/tools/memory-model/Documentation/recipes.txt
+++ b/tools/memory-model/Documentation/recipes.txt
@@ -126,7 +126,7 @@ However, it is not necessarily the case that accesses ordered by
locking will be seen as ordered by CPUs not holding that lock.
Consider this example:
- /* See Z6.0+pooncelock+pooncelock+pombonce.litmus. */
+ /* See Z6.0+pooncerelease+poacquirerelease+fencembonceonce.litmus. */
void CPU0(void)
{
spin_lock(&mylock);
@@ -292,7 +292,7 @@ and to use smp_load_acquire() instead of smp_rmb(). However, the older
smp_wmb() and smp_rmb() APIs are still heavily used, so it is important
to understand their use cases. The general approach is shown below:
- /* See MP+wmbonceonce+rmbonceonce.litmus. */
+ /* See MP+fencewmbonceonce+fencermbonceonce.litmus. */
void CPU0(void)
{
WRITE_ONCE(x, 1);
@@ -360,7 +360,7 @@ can be seen in the LB+poonceonces.litmus litmus test.
One way of avoiding the counter-intuitive outcome is through the use of a
control dependency paired with a full memory barrier:
- /* See LB+ctrlonceonce+mbonceonce.litmus. */
+ /* See LB+fencembonceonce+ctrlonceonce.litmus. */
void CPU0(void)
{
r0 = READ_ONCE(x);
@@ -476,7 +476,7 @@ that one CPU first stores to one variable and then loads from a second,
while another CPU stores to the second variable and then loads from the
first. Preserving order requires nothing less than full barriers:
- /* See SB+mbonceonces.litmus. */
+ /* See SB+fencembonceonces.litmus. */
void CPU0(void)
{
WRITE_ONCE(x, 1);
diff --git a/tools/memory-model/README b/tools/memory-model/README
index 734f7feaa5dc5..ee987ce20aaec 100644
--- a/tools/memory-model/README
+++ b/tools/memory-model/README
@@ -35,13 +35,13 @@ BASIC USAGE: HERD7
The memory model is used, in conjunction with "herd7", to exhaustively
explore the state space of small litmus tests.
-For example, to run SB+mbonceonces.litmus against the memory model:
+For example, to run SB+fencembonceonces.litmus against the memory model:
- $ herd7 -conf linux-kernel.cfg litmus-tests/SB+mbonceonces.litmus
+ $ herd7 -conf linux-kernel.cfg litmus-tests/SB+fencembonceonces.litmus
Here is the corresponding output:
- Test SB+mbonceonces Allowed
+ Test SB+fencembonceonces Allowed
States 3
0:r0=0; 1:r0=1;
0:r0=1; 1:r0=0;
@@ -50,8 +50,8 @@ Here is the corresponding output:
Witnesses
Positive: 0 Negative: 3
Condition exists (0:r0=0 /\ 1:r0=0)
- Observation SB+mbonceonces Never 0 3
- Time SB+mbonceonces 0.01
+ Observation SB+fencembonceonces Never 0 3
+ Time SB+fencembonceonces 0.01
Hash=d66d99523e2cac6b06e66f4c995ebb48
The "Positive: 0 Negative: 3" and the "Never 0 3" each indicate that
@@ -67,16 +67,16 @@ BASIC USAGE: KLITMUS7
The "klitmus7" tool converts a litmus test into a Linux kernel module,
which may then be loaded and run.
-For example, to run SB+mbonceonces.litmus against hardware:
+For example, to run SB+fencembonceonces.litmus against hardware:
$ mkdir mymodules
- $ klitmus7 -o mymodules litmus-tests/SB+mbonceonces.litmus
+ $ klitmus7 -o mymodules litmus-tests/SB+fencembonceonces.litmus
$ cd mymodules ; make
$ sudo sh run.sh
The corresponding output includes:
- Test SB+mbonceonces Allowed
+ Test SB+fencembonceonces Allowed
Histogram (3 states)
644580 :>0:r0=1; 1:r0=0;
644328 :>0:r0=0; 1:r0=1;
@@ -86,8 +86,8 @@ The corresponding output includes:
Positive: 0, Negative: 2000000
Condition exists (0:r0=0 /\ 1:r0=0) is NOT validated
Hash=d66d99523e2cac6b06e66f4c995ebb48
- Observation SB+mbonceonces Never 0 2000000
- Time SB+mbonceonces 0.16
+ Observation SB+fencembonceonces Never 0 2000000
+ Time SB+fencembonceonces 0.16
The "Positive: 0 Negative: 2000000" and the "Never 0 2000000" indicate
that during two million trials, the state specified in this litmus
diff --git a/tools/memory-model/litmus-tests/IRIW+fencembonceonces+OnceOnce.litmus b/tools/memory-model/litmus-tests/IRIW+fencembonceonces+OnceOnce.litmus
new file mode 100644
index 0000000000000..e729d2776e89a
--- /dev/null
+++ b/tools/memory-model/litmus-tests/IRIW+fencembonceonces+OnceOnce.litmus
@@ -0,0 +1,45 @@
+C IRIW+fencembonceonces+OnceOnce
+
+(*
+ * Result: Never
+ *
+ * Test of independent reads from independent writes with smp_mb()
+ * between each pairs of reads. In other words, is smp_mb() sufficient to
+ * cause two different reading processes to agree on the order of a pair
+ * of writes, where each write is to a different variable by a different
+ * process? This litmus test exercises LKMM's "propagation" rule.
+ *)
+
+{}
+
+P0(int *x)
+{
+ WRITE_ONCE(*x, 1);
+}
+
+P1(int *x, int *y)
+{
+ int r0;
+ int r1;
+
+ r0 = READ_ONCE(*x);
+ smp_mb();
+ r1 = READ_ONCE(*y);
+}
+
+P2(int *y)
+{
+ WRITE_ONCE(*y, 1);
+}
+
+P3(int *x, int *y)
+{
+ int r0;
+ int r1;
+
+ r0 = READ_ONCE(*y);
+ smp_mb();
+ r1 = READ_ONCE(*x);
+}
+
+exists (1:r0=1 /\ 1:r1=0 /\ 3:r0=1 /\ 3:r1=0)
diff --git a/tools/memory-model/litmus-tests/IRIW+mbonceonces+OnceOnce.litmus b/tools/memory-model/litmus-tests/IRIW+mbonceonces+OnceOnce.litmus
deleted file mode 100644
index 98a3716efa37e..0000000000000
--- a/tools/memory-model/litmus-tests/IRIW+mbonceonces+OnceOnce.litmus
+++ /dev/null
@@ -1,45 +0,0 @@
-C IRIW+mbonceonces+OnceOnce
-
-(*
- * Result: Never
- *
- * Test of independent reads from independent writes with smp_mb()
- * between each pairs of reads. In other words, is smp_mb() sufficient to
- * cause two different reading processes to agree on the order of a pair
- * of writes, where each write is to a different variable by a different
- * process? This litmus test exercises LKMM's "propagation" rule.
- *)
-
-{}
-
-P0(int *x)
-{
- WRITE_ONCE(*x, 1);
-}
-
-P1(int *x, int *y)
-{
- int r0;
- int r1;
-
- r0 = READ_ONCE(*x);
- smp_mb();
- r1 = READ_ONCE(*y);
-}
-
-P2(int *y)
-{
- WRITE_ONCE(*y, 1);
-}
-
-P3(int *x, int *y)
-{
- int r0;
- int r1;
-
- r0 = READ_ONCE(*y);
- smp_mb();
- r1 = READ_ONCE(*x);
-}
-
-exists (1:r0=1 /\ 1:r1=0 /\ 3:r0=1 /\ 3:r1=0)
diff --git a/tools/memory-model/litmus-tests/LB+ctrlonceonce+mbonceonce.litmus b/tools/memory-model/litmus-tests/LB+ctrlonceonce+mbonceonce.litmus
deleted file mode 100644
index de6708229dd11..0000000000000
--- a/tools/memory-model/litmus-tests/LB+ctrlonceonce+mbonceonce.litmus
+++ /dev/null
@@ -1,34 +0,0 @@
-C LB+ctrlonceonce+mbonceonce
-
-(*
- * Result: Never
- *
- * This litmus test demonstrates that lightweight ordering suffices for
- * the load-buffering pattern, in other words, preventing all processes
- * reading from the preceding process's write. In this example, the
- * combination of a control dependency and a full memory barrier are enough
- * to do the trick. (But the full memory barrier could be replaced with
- * another control dependency and order would still be maintained.)
- *)
-
-{}
-
-P0(int *x, int *y)
-{
- int r0;
-
- r0 = READ_ONCE(*x);
- if (r0)
- WRITE_ONCE(*y, 1);
-}
-
-P1(int *x, int *y)
-{
- int r0;
-
- r0 = READ_ONCE(*y);
- smp_mb();
- WRITE_ONCE(*x, 1);
-}
-
-exists (0:r0=1 /\ 1:r0=1)
diff --git a/tools/memory-model/litmus-tests/LB+fencembonceonce+ctrlonceonce.litmus b/tools/memory-model/litmus-tests/LB+fencembonceonce+ctrlonceonce.litmus
new file mode 100644
index 0000000000000..4727f5aaf03b0
--- /dev/null
+++ b/tools/memory-model/litmus-tests/LB+fencembonceonce+ctrlonceonce.litmus
@@ -0,0 +1,34 @@
+C LB+fencembonceonce+ctrlonceonce
+
+(*
+ * Result: Never
+ *
+ * This litmus test demonstrates that lightweight ordering suffices for
+ * the load-buffering pattern, in other words, preventing all processes
+ * reading from the preceding process's write. In this example, the
+ * combination of a control dependency and a full memory barrier are enough
+ * to do the trick. (But the full memory barrier could be replaced with
+ * another control dependency and order would still be maintained.)
+ *)
+
+{}
+
+P0(int *x, int *y)
+{
+ int r0;
+
+ r0 = READ_ONCE(*x);
+ if (r0)
+ WRITE_ONCE(*y, 1);
+}
+
+P1(int *x, int *y)
+{
+ int r0;
+
+ r0 = READ_ONCE(*y);
+ smp_mb();
+ WRITE_ONCE(*x, 1);
+}
+
+exists (0:r0=1 /\ 1:r0=1)
diff --git a/tools/memory-model/litmus-tests/MP+fencewmbonceonce+fencermbonceonce.litmus b/tools/memory-model/litmus-tests/MP+fencewmbonceonce+fencermbonceonce.litmus
new file mode 100644
index 0000000000000..a273da9faa6d3
--- /dev/null
+++ b/tools/memory-model/litmus-tests/MP+fencewmbonceonce+fencermbonceonce.litmus
@@ -0,0 +1,30 @@
+C MP+fencewmbonceonce+fencermbonceonce
+
+(*
+ * Result: Never
+ *
+ * This litmus test demonstrates that smp_wmb() and smp_rmb() provide
+ * sufficient ordering for the message-passing pattern. However, it
+ * is usually better to use smp_store_release() and smp_load_acquire().
+ *)
+
+{}
+
+P0(int *x, int *y)
+{
+ WRITE_ONCE(*x, 1);
+ smp_wmb();
+ WRITE_ONCE(*y, 1);
+}
+
+P1(int *x, int *y)
+{
+ int r0;
+ int r1;
+
+ r0 = READ_ONCE(*y);
+ smp_rmb();
+ r1 = READ_ONCE(*x);
+}
+
+exists (1:r0=1 /\ 1:r1=0)
diff --git a/tools/memory-model/litmus-tests/MP+wmbonceonce+rmbonceonce.litmus b/tools/memory-model/litmus-tests/MP+wmbonceonce+rmbonceonce.litmus
deleted file mode 100644
index c078f38ff27ac..0000000000000
--- a/tools/memory-model/litmus-tests/MP+wmbonceonce+rmbonceonce.litmus
+++ /dev/null
@@ -1,30 +0,0 @@
-C MP+wmbonceonce+rmbonceonce
-
-(*
- * Result: Never
- *
- * This litmus test demonstrates that smp_wmb() and smp_rmb() provide
- * sufficient ordering for the message-passing pattern. However, it
- * is usually better to use smp_store_release() and smp_load_acquire().
- *)
-
-{}
-
-P0(int *x, int *y)
-{
- WRITE_ONCE(*x, 1);
- smp_wmb();
- WRITE_ONCE(*y, 1);
-}
-
-P1(int *x, int *y)
-{
- int r0;
- int r1;
-
- r0 = READ_ONCE(*y);
- smp_rmb();
- r1 = READ_ONCE(*x);
-}
-
-exists (1:r0=1 /\ 1:r1=0)
diff --git a/tools/memory-model/litmus-tests/R+fencembonceonces.litmus b/tools/memory-model/litmus-tests/R+fencembonceonces.litmus
new file mode 100644
index 0000000000000..222a0b850b4a5
--- /dev/null
+++ b/tools/memory-model/litmus-tests/R+fencembonceonces.litmus
@@ -0,0 +1,30 @@
+C R+fencembonceonces
+
+(*
+ * Result: Never
+ *
+ * This is the fully ordered (via smp_mb()) version of one of the classic
+ * counterintuitive litmus tests that illustrates the effects of store
+ * propagation delays. Note that weakening either of the barriers would
+ * cause the resulting test to be allowed.
+ *)
+
+{}
+
+P0(int *x, int *y)
+{
+ WRITE_ONCE(*x, 1);
+ smp_mb();
+ WRITE_ONCE(*y, 1);
+}
+
+P1(int *x, int *y)
+{
+ int r0;
+
+ WRITE_ONCE(*y, 2);
+ smp_mb();
+ r0 = READ_ONCE(*x);
+}
+
+exists (y=2 /\ 1:r0=0)
diff --git a/tools/memory-model/litmus-tests/R+mbonceonces.litmus b/tools/memory-model/litmus-tests/R+mbonceonces.litmus
deleted file mode 100644
index a0e884ad21321..0000000000000
--- a/tools/memory-model/litmus-tests/R+mbonceonces.litmus
+++ /dev/null
@@ -1,30 +0,0 @@
-C R+mbonceonces
-
-(*
- * Result: Never
- *
- * This is the fully ordered (via smp_mb()) version of one of the classic
- * counterintuitive litmus tests that illustrates the effects of store
- * propagation delays. Note that weakening either of the barriers would
- * cause the resulting test to be allowed.
- *)
-
-{}
-
-P0(int *x, int *y)
-{
- WRITE_ONCE(*x, 1);
- smp_mb();
- WRITE_ONCE(*y, 1);
-}
-
-P1(int *x, int *y)
-{
- int r0;
-
- WRITE_ONCE(*y, 2);
- smp_mb();
- r0 = READ_ONCE(*x);
-}
-
-exists (y=2 /\ 1:r0=0)
diff --git a/tools/memory-model/litmus-tests/README b/tools/memory-model/litmus-tests/README
index 9c0ea65c53621..a41b027234286 100644
--- a/tools/memory-model/litmus-tests/README
+++ b/tools/memory-model/litmus-tests/README
@@ -20,7 +20,7 @@ CoWW+poonceonce.litmus
Test of write-write coherence, that is, whether or not two
successive writes to the same variable are ordered.
-IRIW+mbonceonces+OnceOnce.litmus
+IRIW+fencembonceonces+OnceOnce.litmus
Test of independent reads from independent writes with smp_mb()
between each pairs of reads. In other words, is smp_mb()
sufficient to cause two different reading processes to agree on
@@ -49,7 +49,7 @@ ISA2+pooncerelease+poacquirerelease+poacquireonce.litmus
Can a release-acquire chain order a prior store against
a later load?
-LB+ctrlonceonce+mbonceonce.litmus
+LB+fencembonceonce+ctrlonceonce.litmus
Does a control dependency and an smp_mb() suffice for the
load-buffering litmus test, where each process reads from one
of two variables then writes to the other?
@@ -90,14 +90,14 @@ MP+porevlocks.litmus
As below, but with the first access of the writer process
and the second access of reader process protected by a lock.
-MP+wmbonceonce+rmbonceonce.litmus
+MP+fencewmbonceonce+fencermbonceonce.litmus
Does a smp_wmb() (between the stores) and an smp_rmb() (between
the loads) suffice for the message-passing litmus test, where one
process writes data and then a flag, and the other process reads
the flag and then the data. (This is similar to the ISA2 tests,
but with two processes instead of three.)
-R+mbonceonces.litmus
+R+fencembonceonces.litmus
This is the fully ordered (via smp_mb()) version of one of
the classic counterintuitive litmus tests that illustrates the
effects of store propagation delays.
@@ -105,7 +105,7 @@ R+mbonceonces.litmus
R+poonceonces.litmus
As above, but without the smp_mb() invocations.
-SB+mbonceonces.litmus
+SB+fencembonceonces.litmus
This is the fully ordered (again, via smp_mb() version of store
buffering, which forms the core of Dekker's mutual-exclusion
algorithm.
@@ -125,12 +125,12 @@ SB+rfionceonce-poonceonces.litmus
S+poonceonces.litmus
As below, but without the smp_wmb() and acquire load.
-S+wmbonceonce+poacquireonce.litmus
+S+fencewmbonceonce+poacquireonce.litmus
Can a smp_wmb(), instead of a release, and an acquire order
a prior store against a subsequent store?
WRC+poonceonces+Once.litmus
-WRC+pooncerelease+rmbonceonce+Once.litmus
+WRC+pooncerelease+fencermbonceonce+Once.litmus
These two are members of an extension of the MP litmus-test
class in which the first write is moved to a separate process.
The second is forbidden because smp_store_release() is
@@ -145,7 +145,7 @@ Z6.0+pooncelock+poonceLock+pombonce.litmus
As above, but with smp_mb__after_spinlock() immediately
following the spin_lock().
-Z6.0+pooncerelease+poacquirerelease+mbonceonce.litmus
+Z6.0+pooncerelease+poacquirerelease+fencembonceonce.litmus
Is the ordering provided by a release-acquire chain sufficient
to make ordering apparent to accesses by a process that does
not participate in that release-acquire chain?
diff --git a/tools/memory-model/litmus-tests/S+fencewmbonceonce+poacquireonce.litmus b/tools/memory-model/litmus-tests/S+fencewmbonceonce+poacquireonce.litmus
new file mode 100644
index 0000000000000..18479823cd6cc
--- /dev/null
+++ b/tools/memory-model/litmus-tests/S+fencewmbonceonce+poacquireonce.litmus
@@ -0,0 +1,27 @@
+C S+fencewmbonceonce+poacquireonce
+
+(*
+ * Result: Never
+ *
+ * Can a smp_wmb(), instead of a release, and an acquire order a prior
+ * store against a subsequent store?
+ *)
+
+{}
+
+P0(int *x, int *y)
+{
+ WRITE_ONCE(*x, 2);
+ smp_wmb();
+ WRITE_ONCE(*y, 1);
+}
+
+P1(int *x, int *y)
+{
+ int r0;
+
+ r0 = smp_load_acquire(y);
+ WRITE_ONCE(*x, 1);
+}
+
+exists (x=2 /\ 1:r0=1)
diff --git a/tools/memory-model/litmus-tests/S+wmbonceonce+poacquireonce.litmus b/tools/memory-model/litmus-tests/S+wmbonceonce+poacquireonce.litmus
deleted file mode 100644
index c53350205d282..0000000000000
--- a/tools/memory-model/litmus-tests/S+wmbonceonce+poacquireonce.litmus
+++ /dev/null
@@ -1,27 +0,0 @@
-C S+wmbonceonce+poacquireonce
-
-(*
- * Result: Never
- *
- * Can a smp_wmb(), instead of a release, and an acquire order a prior
- * store against a subsequent store?
- *)
-
-{}
-
-P0(int *x, int *y)
-{
- WRITE_ONCE(*x, 2);
- smp_wmb();
- WRITE_ONCE(*y, 1);
-}
-
-P1(int *x, int *y)
-{
- int r0;
-
- r0 = smp_load_acquire(y);
- WRITE_ONCE(*x, 1);
-}
-
-exists (x=2 /\ 1:r0=1)
diff --git a/tools/memory-model/litmus-tests/SB+fencembonceonces.litmus b/tools/memory-model/litmus-tests/SB+fencembonceonces.litmus
new file mode 100644
index 0000000000000..ed5fff18d2232
--- /dev/null
+++ b/tools/memory-model/litmus-tests/SB+fencembonceonces.litmus
@@ -0,0 +1,32 @@
+C SB+fencembonceonces
+
+(*
+ * Result: Never
+ *
+ * This litmus test demonstrates that full memory barriers suffice to
+ * order the store-buffering pattern, where each process writes to the
+ * variable that the preceding process reads. (Locking and RCU can also
+ * suffice, but not much else.)
+ *)
+
+{}
+
+P0(int *x, int *y)
+{
+ int r0;
+
+ WRITE_ONCE(*x, 1);
+ smp_mb();
+ r0 = READ_ONCE(*y);
+}
+
+P1(int *x, int *y)
+{
+ int r0;
+
+ WRITE_ONCE(*y, 1);
+ smp_mb();
+ r0 = READ_ONCE(*x);
+}
+
+exists (0:r0=0 /\ 1:r0=0)
diff --git a/tools/memory-model/litmus-tests/SB+mbonceonces.litmus b/tools/memory-model/litmus-tests/SB+mbonceonces.litmus
deleted file mode 100644
index 74b874ffa8dad..0000000000000
--- a/tools/memory-model/litmus-tests/SB+mbonceonces.litmus
+++ /dev/null
@@ -1,32 +0,0 @@
-C SB+mbonceonces
-
-(*
- * Result: Never
- *
- * This litmus test demonstrates that full memory barriers suffice to
- * order the store-buffering pattern, where each process writes to the
- * variable that the preceding process reads. (Locking and RCU can also
- * suffice, but not much else.)
- *)
-
-{}
-
-P0(int *x, int *y)
-{
- int r0;
-
- WRITE_ONCE(*x, 1);
- smp_mb();
- r0 = READ_ONCE(*y);
-}
-
-P1(int *x, int *y)
-{
- int r0;
-
- WRITE_ONCE(*y, 1);
- smp_mb();
- r0 = READ_ONCE(*x);
-}
-
-exists (0:r0=0 /\ 1:r0=0)
diff --git a/tools/memory-model/litmus-tests/WRC+pooncerelease+fencermbonceonce+Once.litmus b/tools/memory-model/litmus-tests/WRC+pooncerelease+fencermbonceonce+Once.litmus
new file mode 100644
index 0000000000000..e9947250d7de6
--- /dev/null
+++ b/tools/memory-model/litmus-tests/WRC+pooncerelease+fencermbonceonce+Once.litmus
@@ -0,0 +1,38 @@
+C WRC+pooncerelease+fencermbonceonce+Once
+
+(*
+ * Result: Never
+ *
+ * This litmus test is an extension of the message-passing pattern, where
+ * the first write is moved to a separate process. Because it features
+ * a release and a read memory barrier, it should be forbidden. More
+ * specifically, this litmus test is forbidden because smp_store_release()
+ * is A-cumulative in LKMM.
+ *)
+
+{}
+
+P0(int *x)
+{
+ WRITE_ONCE(*x, 1);
+}
+
+P1(int *x, int *y)
+{
+ int r0;
+
+ r0 = READ_ONCE(*x);
+ smp_store_release(y, 1);
+}
+
+P2(int *x, int *y)
+{
+ int r0;
+ int r1;
+
+ r0 = READ_ONCE(*y);
+ smp_rmb();
+ r1 = READ_ONCE(*x);
+}
+
+exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)
diff --git a/tools/memory-model/litmus-tests/WRC+pooncerelease+rmbonceonce+Once.litmus b/tools/memory-model/litmus-tests/WRC+pooncerelease+rmbonceonce+Once.litmus
deleted file mode 100644
index ad3448b941e68..0000000000000
--- a/tools/memory-model/litmus-tests/WRC+pooncerelease+rmbonceonce+Once.litmus
+++ /dev/null
@@ -1,38 +0,0 @@
-C WRC+pooncerelease+rmbonceonce+Once
-
-(*
- * Result: Never
- *
- * This litmus test is an extension of the message-passing pattern, where
- * the first write is moved to a separate process. Because it features
- * a release and a read memory barrier, it should be forbidden. More
- * specifically, this litmus test is forbidden because smp_store_release()
- * is A-cumulative in LKMM.
- *)
-
-{}
-
-P0(int *x)
-{
- WRITE_ONCE(*x, 1);
-}
-
-P1(int *x, int *y)
-{
- int r0;
-
- r0 = READ_ONCE(*x);
- smp_store_release(y, 1);
-}
-
-P2(int *x, int *y)
-{
- int r0;
- int r1;
-
- r0 = READ_ONCE(*y);
- smp_rmb();
- r1 = READ_ONCE(*x);
-}
-
-exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)
diff --git a/tools/memory-model/litmus-tests/Z6.0+pooncerelease+poacquirerelease+fencembonceonce.litmus b/tools/memory-model/litmus-tests/Z6.0+pooncerelease+poacquirerelease+fencembonceonce.litmus
new file mode 100644
index 0000000000000..88e70b87a683e
--- /dev/null
+++ b/tools/memory-model/litmus-tests/Z6.0+pooncerelease+poacquirerelease+fencembonceonce.litmus
@@ -0,0 +1,42 @@
+C Z6.0+pooncerelease+poacquirerelease+fencembonceonce
+
+(*
+ * Result: Sometimes
+ *
+ * This litmus test shows that a release-acquire chain, while sufficient
+ * when there is but one non-reads-from (AKA non-rf) link, does not suffice
+ * if there is more than one. Of the three processes, only P1() reads from
+ * P0's write, which means that there are two non-rf links: P1() to P2()
+ * is a write-to-write link (AKA a "coherence" or just "co" link) and P2()
+ * to P0() is a read-to-write link (AKA a "from-reads" or just "fr" link).
+ * When there are two or more non-rf links, you typically will need one
+ * full barrier for each non-rf link. (Exceptions include some cases
+ * involving locking.)
+ *)
+
+{}
+
+P0(int *x, int *y)
+{
+ WRITE_ONCE(*x, 1);
+ smp_store_release(y, 1);
+}
+
+P1(int *y, int *z)
+{
+ int r0;
+
+ r0 = smp_load_acquire(y);
+ smp_store_release(z, 1);
+}
+
+P2(int *x, int *z)
+{
+ int r1;
+
+ WRITE_ONCE(*z, 2);
+ smp_mb();
+ r1 = READ_ONCE(*x);
+}
+
+exists (1:r0=1 /\ z=2 /\ 2:r1=0)
diff --git a/tools/memory-model/litmus-tests/Z6.0+pooncerelease+poacquirerelease+mbonceonce.litmus b/tools/memory-model/litmus-tests/Z6.0+pooncerelease+poacquirerelease+mbonceonce.litmus
deleted file mode 100644
index a20fc3fafb536..0000000000000
--- a/tools/memory-model/litmus-tests/Z6.0+pooncerelease+poacquirerelease+mbonceonce.litmus
+++ /dev/null
@@ -1,42 +0,0 @@
-C Z6.0+pooncerelease+poacquirerelease+mbonceonce
-
-(*
- * Result: Sometimes
- *
- * This litmus test shows that a release-acquire chain, while sufficient
- * when there is but one non-reads-from (AKA non-rf) link, does not suffice
- * if there is more than one. Of the three processes, only P1() reads from
- * P0's write, which means that there are two non-rf links: P1() to P2()
- * is a write-to-write link (AKA a "coherence" or just "co" link) and P2()
- * to P0() is a read-to-write link (AKA a "from-reads" or just "fr" link).
- * When there are two or more non-rf links, you typically will need one
- * full barrier for each non-rf link. (Exceptions include some cases
- * involving locking.)
- *)
-
-{}
-
-P0(int *x, int *y)
-{
- WRITE_ONCE(*x, 1);
- smp_store_release(y, 1);
-}
-
-P1(int *y, int *z)
-{
- int r0;
-
- r0 = smp_load_acquire(y);
- smp_store_release(z, 1);
-}
-
-P2(int *x, int *z)
-{
- int r1;
-
- WRITE_ONCE(*z, 2);
- smp_mb();
- r1 = READ_ONCE(*x);
-}
-
-exists (1:r0=1 /\ z=2 /\ 2:r1=0)
--
2.7.4
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