linux-kernel - [PATCH tip/core/rcu 1/4] Documentation: Fix memory-barriers.txt example

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Message-Id: <1351613076-22022-1-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Tue, 30 Oct 2012 09:04:33 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu, patches@...aro.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 1/4] Documentation: Fix memory-barriers.txt example

From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>

This commit fixes a broken example of overlapping stores in the
Documentation/memory-barriers.txt file.

Reported-by: Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 Documentation/memory-barriers.txt |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
index 2759f7c..3c4e1b3 100644
--- a/Documentation/memory-barriers.txt
+++ b/Documentation/memory-barriers.txt
@@ -251,12 +251,13 @@ And there are a number of things that _must_ or _must_not_ be assumed:
 
      And for:
 
-	*A = X; Y = *A;
+	*A = X; *(A + 4) = Y;
 
-     we may get either of:
+     we may get any of:
 
-	STORE *A = X; Y = LOAD *A;
-	STORE *A = Y = X;
+	STORE *A = X; STORE *(A + 4) = Y;
+	STORE *(A + 4) = Y; STORE *A = X;
+	STORE {*A, *(A + 4) } = {X, Y};
 
 
 =========================
-- 
1.7.8

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