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: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

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

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

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)"

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;

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;
 

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;

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