linux-kernel - [PATCH V2] x86: SGU UV Add volatile semantics to macros that access chipset registers

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Date:	Wed, 9 Sep 2009 21:22:26 -0500
From:	Jack Steiner <steiner@....com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Chris Friesen <cfriesen@...tel.com>,
	Daniel Walker <dwalker@...o99.com>, mingo@...e.hu,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: [PATCH V2] x86: SGU UV Add volatile semantics to macros that access chipset registers

Add volatile-semantics to the SGI UV read/write macros that are
used to access chipset memory mapped registers. No direct
references to volatile are made. Instead the readq/writeq
macros are used.

Signed-off-by: Jack Steiner <steiner@....com>


---
 arch/x86/include/asm/uv/uv_hub.h |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

Index: linux/arch/x86/include/asm/uv/uv_hub.h
===================================================================
--- linux.orig/arch/x86/include/asm/uv/uv_hub.h	2009-09-09 01:34:02.000000000 -0500
+++ linux/arch/x86/include/asm/uv/uv_hub.h	2009-09-09 20:51:53.000000000 -0500
@@ -15,6 +15,7 @@
 #include <linux/numa.h>
 #include <linux/percpu.h>
 #include <linux/timer.h>
+#include <linux/io.h>
 #include <asm/types.h>
 #include <asm/percpu.h>
 #include <asm/uv/uv_mmrs.h>
@@ -258,13 +259,13 @@ static inline unsigned long *uv_global_m
 static inline void uv_write_global_mmr32(int pnode, unsigned long offset,
 				 unsigned long val)
 {
-	*uv_global_mmr32_address(pnode, offset) = val;
+	writeq(val, uv_global_mmr32_address(pnode, offset));
 }
 
 static inline unsigned long uv_read_global_mmr32(int pnode,
 						 unsigned long offset)
 {
-	return *uv_global_mmr32_address(pnode, offset);
+	return readq(uv_global_mmr32_address(pnode, offset));
 }
 
 /*
@@ -281,13 +282,13 @@ static inline unsigned long *uv_global_m
 static inline void uv_write_global_mmr64(int pnode, unsigned long offset,
 				unsigned long val)
 {
-	*uv_global_mmr64_address(pnode, offset) = val;
+	writeq(val, uv_global_mmr64_address(pnode, offset));
 }
 
 static inline unsigned long uv_read_global_mmr64(int pnode,
 						 unsigned long offset)
 {
-	return *uv_global_mmr64_address(pnode, offset);
+	return readq(uv_global_mmr64_address(pnode, offset));
 }
 
 /*
@@ -301,22 +302,22 @@ static inline unsigned long *uv_local_mm
 
 static inline unsigned long uv_read_local_mmr(unsigned long offset)
 {
-	return *uv_local_mmr_address(offset);
+	return readq(uv_local_mmr_address(offset));
 }
 
 static inline void uv_write_local_mmr(unsigned long offset, unsigned long val)
 {
-	*uv_local_mmr_address(offset) = val;
+	writeq(val, uv_local_mmr_address(offset));
 }
 
 static inline unsigned char uv_read_local_mmr8(unsigned long offset)
 {
-	return *((unsigned char *)uv_local_mmr_address(offset));
+	return readq(uv_local_mmr_address(offset));
 }
 
 static inline void uv_write_local_mmr8(unsigned long offset, unsigned char val)
 {
-	*((unsigned char *)uv_local_mmr_address(offset)) = val;
+	writeq(val, uv_local_mmr_address(offset));
 }
 
 /*
--
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