tools/memory-model: Add definitions of plain and marked accesses
This patch adds definitions for marked and plain accesses to the
Linux-Kernel Memory Model. It also modifies the definitions of the
existing parts of the model (including the cumul-fence, prop, hb, pb,
and rb relations) so as to make them apply only to marked accesses.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reviewed-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
diff --git a/tools/memory-model/linux-kernel.bell b/tools/memory-model/linux-kernel.bell
index def9131..b60eb5a 100644
--- a/tools/memory-model/linux-kernel.bell
+++ b/tools/memory-model/linux-kernel.bell
@@ -76,3 +76,8 @@
(* Validate SRCU dynamic match *)
flag ~empty different-values(srcu-rscs) as srcu-bad-nesting
+
+(* Compute marked and plain memory accesses *)
+let Marked = (~M) | IW | Once | Release | Acquire | domain(rmw) | range(rmw) |
+ LKR | LKW | UL | LF | RL | RU
+let Plain = M \ Marked
diff --git a/tools/memory-model/linux-kernel.cat b/tools/memory-model/linux-kernel.cat
index 8341070..ff354e5 100644
--- a/tools/memory-model/linux-kernel.cat
+++ b/tools/memory-model/linux-kernel.cat
@@ -65,19 +65,21 @@
let rwdep = (dep | ctrl) ; [W]
let overwrite = co | fr
let to-w = rwdep | (overwrite & int)
-let to-r = addr | (dep ; rfi)
+let to-r = addr | (dep ; [Marked] ; rfi)
let ppo = to-r | to-w | fence | (po-unlock-rf-lock-po & int)
(* Propagation: Ordering from release operations and strong fences. *)
-let A-cumul(r) = rfe? ; r
-let cumul-fence = A-cumul(strong-fence | po-rel) | wmb | po-unlock-rf-lock-po
-let prop = (overwrite & ext)? ; cumul-fence* ; rfe?
+let A-cumul(r) = (rfe ; [Marked])? ; r
+let cumul-fence = [Marked] ; (A-cumul(strong-fence | po-rel) | wmb |
+ po-unlock-rf-lock-po) ; [Marked]
+let prop = [Marked] ; (overwrite & ext)? ; cumul-fence* ;
+ [Marked] ; rfe? ; [Marked]
(*
* Happens Before: Ordering from the passage of time.
* No fences needed here for prop because relation confined to one process.
*)
-let hb = ppo | rfe | ((prop \ id) & int)
+let hb = [Marked] ; (ppo | rfe | ((prop \ id) & int)) ; [Marked]
acyclic hb as happens-before
(****************************************)
@@ -85,7 +87,7 @@
(****************************************)
(* Propagation: Each non-rf link needs a strong fence. *)
-let pb = prop ; strong-fence ; hb*
+let pb = prop ; strong-fence ; hb* ; [Marked]
acyclic pb as propagation
(*******)
@@ -133,7 +135,7 @@
(rcu-fence ; rcu-link ; rcu-fence)
(* rb orders instructions just as pb does *)
-let rb = prop ; po ; rcu-fence ; po? ; hb* ; pb*
+let rb = prop ; po ; rcu-fence ; po? ; hb* ; pb* ; [Marked]
irreflexive rb as rcu