[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: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 16 insertions, 6 deletions

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 47c08bcd9b24..7e46ad7a7b69 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -529,6 +529,7 @@ config X86_PAE
         bool
         depends on HIGHMEM64G
         default y
+        select RESOURCES_64BIT
 
 # Common NUMA Features
 config NUMA
diff --git a/include/linux/types.h b/include/linux/types.h
index a021e1577336..3f235660a3cd 100644
--- a/include/linux/types.h
+++ b/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;
diff --git a/kernel/resource.c b/kernel/resource.c
index 54835c02ab37..cc73029088a7 100644
--- a/kernel/resource.c
+++ b/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);
diff --git a/mm/Kconfig b/mm/Kconfig
index 66e65ab39426..e3644b0062b1 100644
--- a/mm/Kconfig
+++ b/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.