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Commit 053a96ca authored by Nicolas Pitre's avatar Nicolas Pitre
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[ARM] add CONFIG_HIGHMEM option 



Here it is... HIGHMEM for the ARM architecture.  :-)

If you don't have enough ram for highmem pages to be allocated and still
want to test this, then the cmdline option "vmalloc=" can be used with
a value large enough to force the highmem threshold down.

Successfully tested on a Marvell DB-78x00-BP Development Board with
2 GB of RAM.

Signed-off-by: default avatarNicolas Pitre <nico@marvell.com>
parent 3f973e22

arch/arm/Kconfig

+17 −0
Original line number Diff line number Diff line
@@ -915,6 +915,23 @@ 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