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sparsemem: make SPARSEMEM_VMEMMAP selectable

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SPARSEMEM_VMEMMAP needs to be a selectable config option to support
building the kernel both with and without sparsemem vmemmap support.  This
selection is desirable for platforms which could be configured one way for
platform specific builds and the other for multi-platform builds.

Signed-off-by: Miguel Botón <mboton@gmail.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Acked-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Geoff Levand 2007-12-17 16:19:53 -08:00 committed by Linus Torvalds
parent 2e12a7fb0d
commit a5ee6daa52
1 changed files with 7 additions and 8 deletions
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15
mm/Kconfig
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@ -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