sparsemem: make SPARSEMEM_VMEMMAP selectable

[linux-2.6-omap-h63xx.git] / mm / Kconfig

diff --git a/mm/Kconfig b/mm/Kconfig
index c070ec0c15bfeee19c59659a668f7ab920ee77b3..9ef97417a0b92d1b163c55efe6ced4b2e4ce4c73 100644 (file)
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -112,18 +112,17 @@ config SPARSEMEM_EXTREME
        def_bool y
        depends on SPARSEMEM && !SPARSEMEM_STATIC
 
-#
-# SPARSEMEM_VMEMMAP uses a virtually mapped mem_map to optimise pfn_to_page
-# and page_to_pfn.  The most efficient option where kernel virtual space is
-# not under pressure.
-#
 config SPARSEMEM_VMEMMAP_ENABLE
        def_bool n
 
 config SPARSEMEM_VMEMMAP
-       bool
-       depends on SPARSEMEM
-       default y if (SPARSEMEM_VMEMMAP_ENABLE)
+       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