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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2009-03-24 22:47:45 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-03-24 22:47:45 +0000
commitfbf2b1f9cfdb4e4b5d042839142ed19ff5d46679 (patch)
tree3a17c02aa0cf9bdbed9aa479739974aa2416ecac /arch/arm/Kconfig
parent9a38e989b8ce04923f919fc2a8a24eb07fb484e2 (diff)
parent053a96ca11a9785a7e63fc89eed4514a6446ec58 (diff)
downloadop-kernel-dev-fbf2b1f9cfdb4e4b5d042839142ed19ff5d46679.zip
op-kernel-dev-fbf2b1f9cfdb4e4b5d042839142ed19ff5d46679.tar.gz
Merge branch 'highmem' into devel
Diffstat (limited to 'arch/arm/Kconfig')
-rw-r--r--arch/arm/Kconfig17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index cb4486a..e62b37a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -939,6 +939,23 @@ config NODES_SHIFT
default "2"
depends on NEED_MULTIPLE_NODES
+config HIGHMEM
+ bool "High Memory Support (EXPERIMENTAL)"
+ depends on MMU && EXPERIMENTAL
+ help
+ The address space of ARM processors is only 4 Gigabytes large
+ and it has to accommodate user address space, kernel address
+ space as well as some memory mapped IO. That means that, if you
+ have a large amount of physical memory and/or IO, not all of the
+ memory can be "permanently mapped" by the kernel. The physical
+ memory that is not permanently mapped is called "high memory".
+
+ Depending on the selected kernel/user memory split, minimum
+ vmalloc space and actual amount of RAM, you may not need this
+ option which should result in a slightly faster kernel.
+
+ If unsure, say n.
+
source "mm/Kconfig"
config LEDS
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