generic: add phys_addr_t for holding physical addresses

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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

7 files changed, 15 insertions, 10 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 587da5e0990f..f5f83ee60411 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -22,6 +22,9 @@ config WORD_SIZE
 config PPC_MERGE
         def_bool y
 
+config ARCH_PHYS_ADDR_T_64BIT
+       def_bool PPC64 || PHYS_64BIT
+
 config MMU
         bool
         default y
diff --git a/arch/powerpc/include/asm/types.h b/arch/powerpc/include/asm/types.h
index d3374bc865ba..c646f34c4e8b 100644
--- a/arch/powerpc/include/asm/types.h
+++ b/arch/powerpc/include/asm/types.h
@@ -48,13 +48,6 @@ typedef struct {
 
 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
index ed92864d1325..a0ffb5188c8c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -932,6 +932,9 @@ config X86_PAE
           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
index ab8528793f08..d0e58605a520 100644
--- a/include/asm-x86/page_32.h
+++ b/include/asm-x86/page_32.h
@@ -33,7 +33,6 @@ typedef u64	pmdval_t;
 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	pmdval_t;
 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
index c6916c83e6b1..2456fbf2d7dc 100644
--- a/include/asm-x86/page_64.h
+++ b/include/asm-x86/page_64.h
@@ -79,7 +79,6 @@ typedef unsigned long	pmdval_t;
 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
index d4a9ce6e2760..022c668496da 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -197,6 +197,12 @@ typedef u64 resource_size_t;
 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
index 0bd9c2dbb2a0..91ee3922510a 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -187,6 +187,9 @@ config RESOURCES_64BIT
         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