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config SELECT_MEMORY_MODEL
	def_bool y
	depends on EXPERIMENTAL || ARCH_SELECT_MEMORY_MODEL

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choice
	prompt "Memory model"
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	depends on SELECT_MEMORY_MODEL
	default DISCONTIGMEM_MANUAL if ARCH_DISCONTIGMEM_DEFAULT
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	default SPARSEMEM_MANUAL if ARCH_SPARSEMEM_DEFAULT
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	default FLATMEM_MANUAL
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config FLATMEM_MANUAL
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	bool "Flat Memory"
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	depends on !(ARCH_DISCONTIGMEM_ENABLE || ARCH_SPARSEMEM_ENABLE) || ARCH_FLATMEM_ENABLE
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	help
	  This option allows you to change some of the ways that
	  Linux manages its memory internally.  Most users will
	  only have one option here: FLATMEM.  This is normal
	  and a correct option.

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	  Some users of more advanced features like NUMA and
	  memory hotplug may have different options here.
	  DISCONTIGMEM is an more mature, better tested system,
	  but is incompatible with memory hotplug and may suffer
	  decreased performance over SPARSEMEM.  If unsure between
	  "Sparse Memory" and "Discontiguous Memory", choose
	  "Discontiguous Memory".

	  If unsure, choose this option (Flat Memory) over any other.
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config DISCONTIGMEM_MANUAL
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	bool "Discontiguous Memory"
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	depends on ARCH_DISCONTIGMEM_ENABLE
	help
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	  This option provides enhanced support for discontiguous
	  memory systems, over FLATMEM.  These systems have holes
	  in their physical address spaces, and this option provides
	  more efficient handling of these holes.  However, the vast
	  majority of hardware has quite flat address spaces, and
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	  can have degraded performance from the extra overhead that
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	  this option imposes.

	  Many NUMA configurations will have this as the only option.

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	  If unsure, choose "Flat Memory" over this option.

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config SPARSEMEM_MANUAL
	bool "Sparse Memory"
	depends on ARCH_SPARSEMEM_ENABLE
	help
	  This will be the only option for some systems, including
	  memory hotplug systems.  This is normal.

	  For many other systems, this will be an alternative to
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	  "Discontiguous Memory".  This option provides some potential
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	  performance benefits, along with decreased code complexity,
	  but it is newer, and more experimental.

	  If unsure, choose "Discontiguous Memory" or "Flat Memory"
	  over this option.

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endchoice

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config DISCONTIGMEM
	def_bool y
	depends on (!SELECT_MEMORY_MODEL && ARCH_DISCONTIGMEM_ENABLE) || DISCONTIGMEM_MANUAL

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config SPARSEMEM
	def_bool y
	depends on SPARSEMEM_MANUAL

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config FLATMEM
	def_bool y
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	depends on (!DISCONTIGMEM && !SPARSEMEM) || FLATMEM_MANUAL

config FLAT_NODE_MEM_MAP
	def_bool y
	depends on !SPARSEMEM
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#
# Both the NUMA code and DISCONTIGMEM use arrays of pg_data_t's
# to represent different areas of memory.  This variable allows
# those dependencies to exist individually.
#
config NEED_MULTIPLE_NODES
	def_bool y
	depends on DISCONTIGMEM || NUMA
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config HAVE_MEMORY_PRESENT
	def_bool y
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	depends on ARCH_HAVE_MEMORY_PRESENT || SPARSEMEM
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#
# SPARSEMEM_EXTREME (which is the default) does some bootmem
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# allocations when memory_present() is called.  If this cannot
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# be done on your architecture, select this option.  However,
# statically allocating the mem_section[] array can potentially
# consume vast quantities of .bss, so be careful.
#
# This option will also potentially produce smaller runtime code
# with gcc 3.4 and later.
#
config SPARSEMEM_STATIC
	def_bool n

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#
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# Architecture platforms which require a two level mem_section in SPARSEMEM
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# must select this option. This is usually for architecture platforms with
# an extremely sparse physical address space.
#
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config SPARSEMEM_EXTREME
	def_bool y
	depends on SPARSEMEM && !SPARSEMEM_STATIC
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config SPARSEMEM_VMEMMAP_ENABLE
	def_bool n

config SPARSEMEM_VMEMMAP
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	bool "Sparse Memory virtual memmap"
	depends on SPARSEMEM && SPARSEMEM_VMEMMAP_ENABLE
	default y
	help
	 SPARSEMEM_VMEMMAP uses a virtually mapped memmap to optimise
	 pfn_to_page and page_to_pfn operations.  This is the most
	 efficient option when sufficient kernel resources are available.
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# eventually, we can have this option just 'select SPARSEMEM'
config MEMORY_HOTPLUG
	bool "Allow for memory hot-add"
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	depends on SPARSEMEM || X86_64_ACPI_NUMA
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	depends on HOTPLUG && !HIBERNATION && ARCH_ENABLE_MEMORY_HOTPLUG
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	depends on (IA64 || X86 || PPC64 || SUPERH || S390)
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comment "Memory hotplug is currently incompatible with Software Suspend"
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	depends on SPARSEMEM && HOTPLUG && HIBERNATION
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config MEMORY_HOTPLUG_SPARSE
	def_bool y
	depends on SPARSEMEM && MEMORY_HOTPLUG

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config MEMORY_HOTREMOVE
	bool "Allow for memory hot remove"
	depends on MEMORY_HOTPLUG && ARCH_ENABLE_MEMORY_HOTREMOVE
	depends on MIGRATION

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#
# If we have space for more page flags then we can enable additional
# optimizations and functionality.
#
# Regular Sparsemem takes page flag bits for the sectionid if it does not
# use a virtual memmap. Disable extended page flags for 32 bit platforms
# that require the use of a sectionid in the page flags.
#
config PAGEFLAGS_EXTENDED
	def_bool y
	depends on 64BIT || SPARSEMEM_VMEMMAP || !NUMA || !SPARSEMEM

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# Heavily threaded applications may benefit from splitting the mm-wide
# page_table_lock, so that faults on different parts of the user address
# space can be handled with less contention: split it at this NR_CPUS.
# Default to 4 for wider testing, though 8 might be more appropriate.
# ARM's adjust_pte (unused if VIPT) depends on mm-wide page_table_lock.
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# PA-RISC 7xxx's spinlock_t would enlarge struct page from 32 to 44 bytes.
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#
config SPLIT_PTLOCK_CPUS
	int
	default "4096" if ARM && !CPU_CACHE_VIPT
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	default "4096" if PARISC && !PA20
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	default "4"
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#
# support for page migration
#
config MIGRATION
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	bool "Page migration"
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	def_bool y
	depends on NUMA
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	help
	  Allows the migration of the physical location of pages of processes
	  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.
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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.
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config ZONE_DMA_FLAG
	int
	default "0" if !ZONE_DMA
	default "1"

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config BOUNCE
	def_bool y
	depends on BLOCK && MMU && (ZONE_DMA || HIGHMEM)

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config NR_QUICK
	int
	depends on QUICKLIST
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	default "2" if SUPERH
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	default "1"
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config VIRT_TO_BUS
	def_bool y
	depends on !ARCH_NO_VIRT_TO_BUS