Turn rtlx upside down.

[karo-tx-linux.git] / mm / Kconfig

diff --git a/mm/Kconfig b/mm/Kconfig
index cd379936cac663eb1c4f1a730460ceda4216c477..1a4473fcb2ca0d2ea163301ba49d740d78310e8b 100644 (file)
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -29,7 +29,7 @@ config FLATMEM_MANUAL
          If unsure, choose this option (Flat Memory) over any other.
 
 config DISCONTIGMEM_MANUAL
-       bool "Discontigious Memory"
+       bool "Discontiguous Memory"
        depends on ARCH_DISCONTIGMEM_ENABLE
        help
          This option provides enhanced support for discontiguous
@@ -52,7 +52,7 @@ config SPARSEMEM_MANUAL
          memory hotplug systems.  This is normal.
 
          For many other systems, this will be an alternative to
-         "Discontigious Memory".  This option provides some potential
+         "Discontiguous Memory".  This option provides some potential
          performance benefits, along with decreased code complexity,
          but it is newer, and more experimental.
 
@@ -89,3 +89,46 @@ config NEED_MULTIPLE_NODES
 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 can not
+# 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
+
+#
+# Architectecture 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
+
+# eventually, we can have this option just 'select SPARSEMEM'
+config MEMORY_HOTPLUG
+       bool "Allow for memory hot-add"
+       depends on SPARSEMEM && HOTPLUG && !SOFTWARE_SUSPEND
+
+comment "Memory hotplug is currently incompatible with Software Suspend"
+       depends on SPARSEMEM && HOTPLUG && SOFTWARE_SUSPEND
+
+# 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's debug spinlock_t is too large for the 32-bit struct page.
+#
+config SPLIT_PTLOCK_CPUS
+       int
+       default "4096" if ARM && !CPU_CACHE_VIPT
+       default "4096" if PARISC && DEBUG_SPINLOCK && !64BIT
+       default "4"