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authorAndy Whitcroft <apw@shadowen.org>2007-10-16 01:24:14 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:51 -0700
commit29c71111d0557385328211b130246a90f9223b46 (patch)
tree5588a49ee548d38e15bd7541cec29e069b9e457c /mm/Kconfig
parent8f6aac419bd590f535fb110875a51f7db2b62b5b (diff)
downloadblackbird-op-linux-29c71111d0557385328211b130246a90f9223b46.tar.gz
blackbird-op-linux-29c71111d0557385328211b130246a90f9223b46.zip
vmemmap: generify initialisation via helpers
Convert the common vmemmap population into initialisation helpers for use by architecture vmemmap populators. All architecture implementing the SPARSEMEM_VMEMMAP variant supply an architecture specific vmemmap_populate() initialiser, which may make use of the helpers. This allows us to clean up and remove the initialisation Kconfig entries. With this patch there is a single SPARSEMEM_VMEMMAP_ENABLE Kconfig option to indicate use of that variant. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig')
-rw-r--r--mm/Kconfig13
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index a7609cbcb00d..b06730668412 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -112,6 +112,19 @@ 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)
+
# eventually, we can have this option just 'select SPARSEMEM'
config MEMORY_HOTPLUG
bool "Allow for memory hot-add"
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