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config SELECT_MEMORY_MODEL
        def_bool y
        depends on EXPERIMENTAL || ARCH_SELECT_MEMORY_MODEL

choice
        prompt "Memory model"
        depends on SELECT_MEMORY_MODEL
        default DISCONTIGMEM_MANUAL if ARCH_DISCONTIGMEM_DEFAULT
        default SPARSEMEM_MANUAL if ARCH_SPARSEMEM_DEFAULT
        default FLATMEM_MANUAL

config FLATMEM_MANUAL
        bool "Flat Memory"
        depends on !(ARCH_DISCONTIGMEM_ENABLE || ARCH_SPARSEMEM_ENABLE) || ARCH_FLATMEM_ENABLE
        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.

          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.

config DISCONTIGMEM_MANUAL
        bool "Discontiguous Memory"
        depends on ARCH_DISCONTIGMEM_ENABLE
        help
          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
          can have degraded performance from the extra overhead that
          this option imposes.

          Many NUMA configurations will have this as the only option.

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

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
          "Discontiguous Memory".  This option provides some potential
          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.

endchoice

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

config SPARSEMEM
        def_bool y
        depends on SPARSEMEM_MANUAL

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

config FLAT_NODE_MEM_MAP
        def_bool y
        depends on !SPARSEMEM

#
# 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

config HAVE_MEMORY_PRESENT
        def_bool y
        depends on ARCH_HAVE_MEMORY_PRESENT || SPARSEMEM

#
# SPARSEMEM_EXTREME (which is the default) does some bootmem
# allocations when memory_present() is called.  If this cannot
# 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

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

config SPARSEMEM_VMEMMAP_ENABLE
        def_bool n

config SPARSEMEM_VMEMMAP
        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.

# eventually, we can have this option just 'select SPARSEMEM'
config MEMORY_HOTPLUG
        bool "Allow for memory hot-add"
        depends on SPARSEMEM || X86_64_ACPI_NUMA
        depends on HOTPLUG && !HIBERNATION && ARCH_ENABLE_MEMORY_HOTPLUG
        depends on (IA64 || X86 || PPC64 || SUPERH)

comment "Memory hotplug is currently incompatible with Software Suspend"
        depends on SPARSEMEM && HOTPLUG && HIBERNATION

config MEMORY_HOTPLUG_SPARSE
        def_bool y
        depends on SPARSEMEM && MEMORY_HOTPLUG

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

# 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.
# PA-RISC 7xxx's spinlock_t would enlarge struct page from 32 to 44 bytes.
#
config SPLIT_PTLOCK_CPUS
        int
        default "4096" if ARM && !CPU_CACHE_VIPT
        default "4096" if PARISC && !PA20
        default "4"

#
# support for page migration
#
config MIGRATION
        bool "Page migration"
        def_bool y
        depends on NUMA
        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.

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.

config ZONE_DMA_FLAG
        int
        default "0" if !ZONE_DMA
        default "1"

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

config NR_QUICK
        int
        depends on QUICKLIST
        default "2" if (SUPERH && !SUPERH64)
        default "1"

config VIRT_TO_BUS
        def_bool y
        depends on !ARCH_NO_VIRT_TO_BUS