[ARM] mm: allow LH7A40x to use sparsemem

Enable Sparsemem support for LH7A40x SoCs, while still allowing the
existing discontig support for the time being.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/Kconfig

@@ -510,6 +510,8 @@ config ARCH_SHARK
 
 config ARCH_LH7A40X
 	bool "Sharp LH7A40X"
+	select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
+	select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
 	help
 	  Say Y here for systems based on one of the Sharp LH7A40X
 	  System on a Chip processors.  These CPUs include an ARM922T
@@ -842,12 +844,6 @@ config OABI_COMPAT
 # Discontigmem is deprecated
 config ARCH_DISCONTIGMEM_ENABLE
 	bool
-	default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
-	help
-	  Say Y to support efficient handling of discontiguous physical memory,
-	  for architectures which are either NUMA (Non-Uniform Memory Access)
-	  or have huge holes in the physical address space for other reasons.
-	  See <file:Documentation/vm/numa> for more.
 
 config ARCH_SPARSEMEM_ENABLE
 	bool

arch/arm/mach-lh7a40x/Kconfig

@@ -40,23 +40,22 @@ config LPD7A40X_CPLD_SSP
 	bool
 
 config LH7A40X_CONTIGMEM
-	bool "Disable NUMA Support"
-	depends on ARCH_LH7A40X
+	bool "Disable NUMA/SparseMEM Support"
 	help
 	  Say Y here if your bootloader sets the SROMLL bit(s) in
 	  the SDRAM controller, organizing memory as a contiguous
-	  array.  This option will disable CONFIG_DISCONTIGMEM and
-          force the kernel to manage all memory in one node.
+	  array.  This option will disable sparse memory support
+          and force the kernel to manage all memory in one node.
 
-	  Setting this option incorrectly may prevent the kernel from
-	  booting.  It is OK to leave it N.
+	  Setting this option incorrectly may prevent the kernel
+	  from booting.  It is OK to leave it N.
 
 	  For more information, consult
 	    <file:Documentation/arm/Sharp-LH/SDRAM>.
 
 config LH7A40X_ONE_BANK_PER_NODE
 	bool "Optimize NUMA Node Tables for Size"
-	depends on ARCH_LH7A40X && !LH7A40X_CONTIGMEM
+	depends on !LH7A40X_CONTIGMEM
 	help
 	  Say Y here to produce compact memory node tables.  By
 	  default pairs of adjacent physical RAM banks are managed

arch/arm/mach-lh7a40x/include/mach/memory.h

@@ -73,4 +73,10 @@
 
 #endif
 
+/*
+ * Sparsemem version of the above
+ */
+#define MAX_PHYSMEM_BITS	32
+#define SECTION_SIZE_BITS	24
+
 #endif