[PATCH 16/17] [PATCH] 64bit Resource: finally enable 64bit resource sizes

[Greg KH]

From: Greg Kroah-Hartman <gregkh@xxxxxxx>

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@xxxxxxxxxx>

Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 arch/i386/Kconfig     |    1 +
 include/linux/types.h |    7 ++++++-
 kernel/resource.c     |    8 +++-----
 mm/Kconfig            |    6 ++++++
 4 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 47c08bc..7e46ad7 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 a021e15..3f23566 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -178,9 +178,14 @@ #endif
 #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 54835c0..cc73029 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -23,20 +23,18 @@ #include <asm/io.h>
 
 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 66e65ab..e3644b0 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.
-- 
1.4.0

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