From: Alan Stern <stern@rowland.harvard.edu>
To: "Paul E. McKenney" <paulmck@linux.ibm.com>
Cc: LKMM Maintainers -- Akira Yokosawa <akiyks@gmail.com>,
Andrea Parri <andrea.parri@amarulasolutions.com>,
Boqun Feng <boqun.feng@gmail.com>,
Daniel Lustig <dlustig@nvidia.com>,
David Howells <dhowells@redhat.com>,
Jade Alglave <j.alglave@ucl.ac.uk>,
Luc Maranget <luc.maranget@inria.fr>,
Nicholas Piggin <npiggin@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Will Deacon <will.deacon@arm.com>,
Kernel development list <linux-kernel@vger.kernel.org>
Subject: [PATCH 1/3] tools/memory-model: Rename some RCU relations
Date: Thu, 15 Nov 2018 11:19:44 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1811151115160.1308-100000@iolanthe.rowland.org> (raw)
In preparation for adding support for SRCU, rename "crit" to
"rcu-rscs", rename "rscs" to "rcu-rscsi", and remove the restriction
to only the outermost level of nesting.
The name change is needed for disambiguating RCU read-side critical
sections from SRCU read-side critical sections. Adding the "i" at the
end of "rcu-rscsi" emphasizes that the relation is inverted; it links
rcu_read_unlock() events to their corresponding preceding
rcu_read_lock() events.
The restriction to outermost nesting levels was never essential; it
was included mostly to show that it could be done. Rather than add
equivalent unnecessary code for SRCU lock nesting, it seemed better to
remove the existing code.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
---
tools/memory-model/linux-kernel.bell | 9 +++------
tools/memory-model/linux-kernel.cat | 10 +++++-----
2 files changed, 8 insertions(+), 11 deletions(-)
Index: usb-4.x/tools/memory-model/linux-kernel.bell
===================================================================
--- usb-4.x.orig/tools/memory-model/linux-kernel.bell
+++ usb-4.x/tools/memory-model/linux-kernel.bell
@@ -34,7 +34,7 @@ enum Barriers = 'wmb (*smp_wmb*) ||
instructions F[Barriers]
(* Compute matching pairs of nested Rcu-lock and Rcu-unlock *)
-let matched = let rec
+let rcu-rscs = let rec
unmatched-locks = Rcu-lock \ domain(matched)
and unmatched-unlocks = Rcu-unlock \ range(matched)
and unmatched = unmatched-locks | unmatched-unlocks
@@ -46,8 +46,5 @@ let matched = let rec
in matched
(* Validate nesting *)
-flag ~empty Rcu-lock \ domain(matched) as unbalanced-rcu-locking
-flag ~empty Rcu-unlock \ range(matched) as unbalanced-rcu-locking
-
-(* Outermost level of nesting only *)
-let crit = matched \ (po^-1 ; matched ; po^-1)
+flag ~empty Rcu-lock \ domain(rcu-rscs) as unbalanced-rcu-locking
+flag ~empty Rcu-unlock \ range(rcu-rscs) as unbalanced-rcu-locking
Index: usb-4.x/tools/memory-model/linux-kernel.cat
===================================================================
--- usb-4.x.orig/tools/memory-model/linux-kernel.cat
+++ usb-4.x/tools/memory-model/linux-kernel.cat
@@ -95,7 +95,7 @@ acyclic pb as propagation
* onward on the one hand and from the rcu_read_unlock() backwards on the
* other hand.
*)
-let rscs = po ; crit^-1 ; po?
+let rcu-rscsi = po ; rcu-rscs^-1 ; po?
(*
* The synchronize_rcu() strong fence is special in that it can order not
@@ -109,10 +109,10 @@ let rcu-link = hb* ; pb* ; prop
* critical sections (joined by rcu-link) acts as a generalized strong fence.
*)
let rec rcu-fence = gp |
- (gp ; rcu-link ; rscs) |
- (rscs ; rcu-link ; gp) |
- (gp ; rcu-link ; rcu-fence ; rcu-link ; rscs) |
- (rscs ; rcu-link ; rcu-fence ; rcu-link ; gp) |
+ (gp ; rcu-link ; rcu-rscsi) |
+ (rcu-rscsi ; rcu-link ; gp) |
+ (gp ; rcu-link ; rcu-fence ; rcu-link ; rcu-rscsi) |
+ (rcu-rscsi ; rcu-link ; rcu-fence ; rcu-link ; gp) |
(rcu-fence ; rcu-link ; rcu-fence)
(* rb orders instructions just as pb does *)
reply other threads:[~2018-11-15 16:19 UTC|newest]
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