[ARM] Add initial sparsemem support

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 23 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4039a133006e..df051bd24ba1 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -422,6 +422,8 @@ config ARCH_SA1100
         bool "SA1100-based"
         select ISA
         select ARCH_DISCONTIGMEM_ENABLE
+        select ARCH_SPARSEMEM_ENABLE
+        select ARCH_SELECT_MEMORY_MODEL
         select ARCH_MTD_XIP
         select GENERIC_GPIO
         select GENERIC_TIME
@@ -774,6 +776,12 @@ config ARCH_DISCONTIGMEM_ENABLE
           or have huge holes in the physical address space for other reasons.
           See <file:Documentation/vm/numa> for more.
 
+config ARCH_SPARSEMEM_ENABLE
+        bool
+
+config ARCH_SELECT_MEMORY_MODEL
+        bool
+
 config NODES_SHIFT
         int
         default "4" if ARCH_LH7A40X
diff --git a/arch/arm/mach-clps711x/Kconfig b/arch/arm/mach-clps711x/Kconfig
index 0e2b641268ad..dbaae5f746a1 100644
--- a/arch/arm/mach-clps711x/Kconfig
+++ b/arch/arm/mach-clps711x/Kconfig
@@ -31,6 +31,8 @@ config ARCH_EDB7211
         bool "EDB7211"
         select ISA
         select ARCH_DISCONTIGMEM_ENABLE
+        select ARCH_SPARSEMEM_ENABLE
+        select ARCH_SELECT_MEMORY_MODEL
         help
           Say Y here if you intend to run this kernel on a Cirrus Logic EDB-7211
           evaluation board.
diff --git a/include/asm-arm/memory.h b/include/asm-arm/memory.h
index d9bfb39adabf..9ba4d7136e6b 100644
--- a/include/asm-arm/memory.h
+++ b/include/asm-arm/memory.h
@@ -217,7 +217,10 @@ static inline __deprecated void *bus_to_virt(unsigned long x)
 #ifndef CONFIG_DISCONTIGMEM
 
 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
+
+#ifndef CONFIG_SPARSEMEM
 #define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
+#endif
 
 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 #define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
diff --git a/include/asm-arm/sparsemem.h b/include/asm-arm/sparsemem.h
new file mode 100644
index 000000000000..277158191a0d
--- /dev/null
+++ b/include/asm-arm/sparsemem.h
@@ -0,0 +1,10 @@
+#ifndef ASMARM_SPARSEMEM_H
+#define ASMARM_SPARSEMEM_H
+
+#include <asm/memory.h>
+
+#define MAX_PHYSADDR_BITS       32
+#define MAX_PHYSMEM_BITS        32
+#define SECTION_SIZE_BITS       NODE_MEM_SIZE_BITS
+
+#endif