linux-kernel - [PATCH tools/memory-model 15/17] tools/memory-order: smp_mb__after

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Message-Id: <1523895165-17576-15-git-send-email-paulmck@linux.vnet.ibm.com>
Date:   Mon, 16 Apr 2018 09:12:43 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Cc:     mingo@...nel.org, stern@...land.harvard.edu,
        parri.andrea@...il.com, will.deacon@....com, peterz@...radead.org,
        boqun.feng@...il.com, npiggin@...il.com, dhowells@...hat.com,
        j.alglave@....ac.uk, luc.maranget@...ia.fr, akiyks@...il.com,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tools/memory-model 15/17] tools/memory-order: smp_mb__after_atomic() orders later RMW operations

The current cheat sheet does not claim that smp_mb__after_atomic()
orders later RMW atomic operations, which it must, at least against
earlier RMW atomic operations and whatever precedes them.  This commit
therefore adds the needed "Y".

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 tools/memory-model/Documentation/cheatsheet.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/memory-model/Documentation/cheatsheet.txt b/tools/memory-model/Documentation/cheatsheet.txt
index d502993ac7d2..94bdc25944d9 100644
--- a/tools/memory-model/Documentation/cheatsheet.txt
+++ b/tools/memory-model/Documentation/cheatsheet.txt
@@ -14,7 +14,7 @@ smp_wmb()                                  Y    W           Y       Y    W
 smp_mb() & synchronize_rcu()  CP        Y  Y    Y        Y  Y   Y   Y    Y
 Successful full non-void RMW  CP     Y  Y  Y    Y     Y  Y  Y   Y   Y    Y   Y
 smp_mb__before_atomic()       CP        Y  Y    Y        a  a   a   a    Y
-smp_mb__after_atomic()        CP        a  a    Y        Y  Y   Y   Y
+smp_mb__after_atomic()        CP        a  a    Y        Y  Y   Y   Y    Y
 
 
 Key:	C:	Ordering is cumulative
-- 
2.5.2