linux-kernel - [PATCH 16/23] make atomic_read() and atomic

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Message-ID: <20070813113342.GP24018@shell.boston.redhat.com>
Date:	Mon, 13 Aug 2007 07:33:42 -0400
From:	Chris Snook <csnook@...hat.com>
To:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	akpm@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	Segher Boessenkool <segher@...nel.crashing.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	Chris Friesen <cfriesen@...tel.com>,
	"Robert P. J. Day" <rpjday@...dspring.com>
Subject: [PATCH 16/23] make atomic_read() and atomic_set() behavior consistent on s390

From: Chris Snook <csnook@...hat.com>

Use volatile consistently in atomic.h on s390.

Signed-off-by: Chris Snook <csnook@...hat.com>

--- linux-2.6.23-rc3-orig/include/asm-s390/atomic.h	2007-08-13 03:14:13.000000000 -0400
+++ linux-2.6.23-rc3/include/asm-s390/atomic.h	2007-08-13 06:04:58.000000000 -0400
@@ -67,8 +67,15 @@ typedef struct {
 
 #endif /* __GNUC__ */
 
-#define atomic_read(v)          ((v)->counter)
-#define atomic_set(v,i)         (((v)->counter) = (i))
+static __inline__ int atomic_read(atomic_t *v)
+{
+        return *(volatile int *)&v->counter;
+}
+
+static __inline__ void atomic_set(atomic_t *v, int i)
+{
+        *(volatile int *)&v->counter = i;
+}
 
 static __inline__ int atomic_add_return(int i, atomic_t * v)
 {
@@ -182,8 +189,15 @@ typedef struct {
 
 #endif /* __GNUC__ */
 
-#define atomic64_read(v)          ((v)->counter)
-#define atomic64_set(v,i)         (((v)->counter) = (i))
+static __inline__ long long atomic64_read(atomic64_t *v)
+{
+        return *(volatile long long *)&v->counter;
+}
+
+static __inline__ void atomic64_set(atomic64_t *v, long long i)
+{
+        *(volatile long long *)&v->counter = i;
+}
 
 static __inline__ long long atomic64_add_return(long long i, atomic64_t * v)
 {
-
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