[PATCH] 64bit Resource: finally enable 64bit resource sizes

Introduce the Kconfig entry and actually switch to a 64bit value, if
wanted, for resource_size_t.

Based on a patch series originally from Vivek Goyal <vgoyal@in.ibm.com>

Cc: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

arch/i386/Kconfig

@@ -529,6 +529,7 @@ config X86_PAE
 	bool
 	depends on HIGHMEM64G
 	default y
+	select RESOURCES_64BIT
 
 # Common NUMA Features
 config NUMA

include/linux/types.h

@@ -178,9 +178,14 @@ typedef __u64 __bitwise __be64;
 #ifdef __KERNEL__
 typedef unsigned __bitwise__ gfp_t;
 
-typedef unsigned long resource_size_t;
+#ifdef CONFIG_RESOURCES_64BIT
+typedef u64 resource_size_t;
+#else
+typedef u32 resource_size_t;
 #endif
 
+#endif	/* __KERNEL__ */
+
 struct ustat {
 	__kernel_daddr_t	f_tfree;
 	__kernel_ino_t		f_tinode;

kernel/resource.c

@@ -23,20 +23,18 @@
 
 struct resource ioport_resource = {
 	.name	= "PCI IO",
-	.start	= 0x0000,
+	.start	= 0,
 	.end	= IO_SPACE_LIMIT,
 	.flags	= IORESOURCE_IO,
 };
-
 EXPORT_SYMBOL(ioport_resource);
 
 struct resource iomem_resource = {
 	.name	= "PCI mem",
-	.start	= 0UL,
-	.end	= ~0UL,
+	.start	= 0,
+	.end	= -1,
 	.flags	= IORESOURCE_MEM,
 };
-
 EXPORT_SYMBOL(iomem_resource);
 
 static DEFINE_RWLOCK(resource_lock);

mm/Kconfig

@@ -145,3 +145,9 @@ config MIGRATION
 	  while the virtual addresses are not changed. This is useful for
 	  example on NUMA systems to put pages nearer to the processors accessing
 	  the page.
+
+config RESOURCES_64BIT
+	bool "64 bit Memory and IO resources (EXPERIMENTAL)" if (!64BIT && EXPERIMENTAL)
+	default 64BIT
+	help
+	  This option allows memory and IO resources to be 64 bit.