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Subject[PATCH 1 of 3] add phys_addr_t for holding physical addresses
Date
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Add a kernel-wide "phys_addr_t" which is guaranteed to be able to hold
any physical address. By default it equals the word size of the
architecture, but a 32-bit architecture can set ARCH_PHYS_ADDR_T_64BIT
if it needs a 64-bit phys_addr_t.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
arch/powerpc/Kconfig | 3 +++
arch/powerpc/include/asm/types.h | 7 -------
arch/x86/Kconfig | 3 +++
include/asm-x86/page_32.h | 2 --
include/asm-x86/page_64.h | 1 -
include/linux/types.h | 6 ++++++
mm/Kconfig | 3 +++
7 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -21,6 +21,9 @@

config PPC_MERGE
def_bool y
+
+config ARCH_PHYS_ADDR_T_64BIT
+ def_bool PPC64 || PHYS_64BIT

config MMU
bool
diff --git a/arch/powerpc/include/asm/types.h b/arch/powerpc/include/asm/types.h
--- a/arch/powerpc/include/asm/types.h
+++ b/arch/powerpc/include/asm/types.h
@@ -48,13 +48,6 @@

typedef __vector128 vector128;

-/* Physical address used by some IO functions */
-#if defined(CONFIG_PPC64) || defined(CONFIG_PHYS_64BIT)
-typedef u64 phys_addr_t;
-#else
-typedef u32 phys_addr_t;
-#endif
-
#ifdef __powerpc64__
typedef u64 dma_addr_t;
#else
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -938,6 +938,9 @@
has the cost of more pagetable lookup overhead, and also
consumes more pagetable space per process.

+config ARCH_PHYS_ADDR_T_64BIT
+ def_bool X86_64 || X86_PAE
+
# Common NUMA Features
config NUMA
bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
diff --git a/include/asm-x86/page_32.h b/include/asm-x86/page_32.h
--- a/include/asm-x86/page_32.h
+++ b/include/asm-x86/page_32.h
@@ -33,7 +33,6 @@
typedef u64 pudval_t;
typedef u64 pgdval_t;
typedef u64 pgprotval_t;
-typedef u64 phys_addr_t;

typedef union {
struct {
@@ -54,7 +53,6 @@
typedef unsigned long pudval_t;
typedef unsigned long pgdval_t;
typedef unsigned long pgprotval_t;
-typedef unsigned long phys_addr_t;

typedef union {
pteval_t pte;
diff --git a/include/asm-x86/page_64.h b/include/asm-x86/page_64.h
--- a/include/asm-x86/page_64.h
+++ b/include/asm-x86/page_64.h
@@ -79,7 +79,6 @@
typedef unsigned long pudval_t;
typedef unsigned long pgdval_t;
typedef unsigned long pgprotval_t;
-typedef unsigned long phys_addr_t;

typedef struct page *pgtable_t;

diff --git a/include/linux/types.h b/include/linux/types.h
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -197,6 +197,12 @@
typedef u32 resource_size_t;
#endif

+#ifdef CONFIG_PHYS_ADDR_T_64BIT
+typedef u64 phys_addr_t;
+#else
+typedef u32 phys_addr_t;
+#endif
+
struct ustat {
__kernel_daddr_t f_tfree;
__kernel_ino_t f_tinode;
diff --git a/mm/Kconfig b/mm/Kconfig
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -187,6 +187,9 @@
help
This option allows memory and IO resources to be 64 bit.

+config PHYS_ADDR_T_64BIT
+ def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
+
config ZONE_DMA_FLAG
int
default "0" if !ZONE_DMA



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