linux-kernel - [PATCH tip/core/rcu 4/5] documentation: Add atomic_long_t to atomic

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Message-Id: <1414533617-25933-4-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Tue, 28 Oct 2014 15:00:16 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com,
	bobby.prani@...il.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 4/5] documentation: Add atomic_long_t to atomic_ops.txt

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

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 Documentation/atomic_ops.txt | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/Documentation/atomic_ops.txt b/Documentation/atomic_ops.txt
index 68542fe13b85..183e41bdcb69 100644
--- a/Documentation/atomic_ops.txt
+++ b/Documentation/atomic_ops.txt
@@ -7,12 +7,13 @@
 maintainers on how to implement atomic counter, bitops, and spinlock
 interfaces properly.
 
-	The atomic_t type should be defined as a signed integer.
-Also, it should be made opaque such that any kind of cast to a normal
-C integer type will fail.  Something like the following should
-suffice:
+	The atomic_t type should be defined as a signed integer and
+the atomic_long_t type as a signed long integer.  Also, they should
+be made opaque such that any kind of cast to a normal C integer type
+will fail.  Something like the following should suffice:
 
 	typedef struct { int counter; } atomic_t;
+	typedef struct { long counter; } atomic_long_t;
 
 Historically, counter has been declared volatile.  This is now discouraged.
 See Documentation/volatile-considered-harmful.txt for the complete rationale.
@@ -37,6 +38,9 @@ initializer is used before runtime.  If the initializer is used at runtime, a
 proper implicit or explicit read memory barrier is needed before reading the
 value with atomic_read from another thread.
 
+As with all of the atomic_ interfaces, replace the leading "atomic_"
+with "atomic_long_" to operate on atomic_long_t.
+
 The second interface can be used at runtime, as in:
 
 	struct foo { atomic_t counter; };
-- 
1.8.1.5

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