[tip:x86/urgent] x86: SGI UV: Add volatile semantics to macros that access chipset registers

From: tip-bot for Jack Steiner
Date: Fri Sep 18 2009 - 08:07:38 EST


Commit-ID: 8dc579e868addafd24c0a015c12f0e536b1084b1
Gitweb: http://git.kernel.org/tip/8dc579e868addafd24c0a015c12f0e536b1084b1
Author: Jack Steiner <steiner@xxxxxxx>
AuthorDate: Thu, 10 Sep 2009 09:31:49 -0500
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Fri, 18 Sep 2009 14:05:32 +0200

x86: SGI 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@xxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: dwalker@xxxxxxxxxx
Cc: cfriesen@xxxxxxxxxx
LKML-Reference: <20090910143149.GA14273@xxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


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

diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h
index 03a0cbd..04eb6c9 100644
--- a/arch/x86/include/asm/uv/uv_hub.h
+++ b/arch/x86/include/asm/uv/uv_hub.h
@@ -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_mmr32_address(int pnode,
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_mmr64_address(int pnode,
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_mmr_address(unsigned long offset)

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 readb(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;
+ writeb(val, uv_local_mmr_address(offset));
}

/*
--
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