Re: [PATCH ] VMSPLIT config options (with default config fixed)

[Herbert Poetzl <herbert@13thfloor.at>]

On Tue, Jan 10, 2006 at 02:16:19PM -0500, Mark Lord wrote:
> Okay, fixed the ordering of the "default" lines
> so that the Kconfig actually works correctly.
> 
> Best for Andrew to soak this one in -mm.

glad to see that the linux kernel is now ready for
the 'idea' I submitted a patch[1] for, more than a 
year ago -- which unfortunately went unnoticed back
then ...

cheers to Jens and Mark!

best,
Herbert

[1] http://lkml.org/lkml/2004/10/9/126

> Signed-off-by:  Mark Lord <mlord@pobox.com>
> 
> diff -u --recursive --new-file --exclude='.*' 
> linux-2.6.15/arch/i386/Kconfig linux/arch/i386/Kconfig
> --- linux-2.6.15/arch/i386/Kconfig	2006-01-02 22:21:10.000000000 -0500
> +++ linux/arch/i386/Kconfig	2006-01-10 12:02:40.000000000 -0500
> @@ -448,6 +448,43 @@
> 
>  endchoice
> 
> +choice
> +	depends on EXPERIMENTAL && !X86_PAE
> +	prompt "Memory split"
> +	default VMSPLIT_3G
> +	help
> +	  Select the desired split between kernel and user memory.
> +
> +	  If the address range available to the kernel is less than the
> +	  physical memory installed, the remaining memory will be available
> +	  as "high memory". Accessing high memory is a little more costly
> +	  than low memory, as it needs to be mapped into the kernel first.
> +	  Note that increasing the kernel address space limits the range
> +	  available to user programs, making the address space there
> +	  tighter.  Selecting anything other than the default 3G/1G split
> +	  will also likely make your kernel incompatible with binary-only
> +	  kernel modules.
> +
> +	  If you are not absolutely sure what you are doing, leave this
> +	  option alone!
> +
> +	config VMSPLIT_3G
> +		bool "3G/1G user/kernel split"
> +	config VMSPLIT_3G_OPT
> +		bool "3G/1G user/kernel split (for full 1G low memory)"
> +	config VMSPLIT_2G
> +		bool "2G/2G user/kernel split"
> +	config VMSPLIT_1G
> +		bool "1G/3G user/kernel split"
> +endchoice
> +
> +config PAGE_OFFSET
> +	hex
> +	default 0xB0000000 if VMSPLIT_3G_OPT
> +	default 0x78000000 if VMSPLIT_2G
> +	default 0x40000000 if VMSPLIT_1G
> +	default 0xC0000000
> +
>  config HIGHMEM
>  	bool
>  	depends on HIGHMEM64G || HIGHMEM4G
> diff -u --recursive --new-file --exclude='.*' 
> linux-2.6.15/include/asm-i386/page.h linux/include/asm-i386/page.h
> --- linux-2.6.15/include/asm-i386/page.h	2006-01-02 
> 22:21:10.000000000 -0500
> +++ linux/include/asm-i386/page.h	2006-01-10 12:04:56.000000000 -0500
> @@ -110,10 +110,10 @@
>  #endif /* __ASSEMBLY__ */
> 
>  #ifdef __ASSEMBLY__
> -#define __PAGE_OFFSET		(0xC0000000)
> +#define __PAGE_OFFSET		CONFIG_PAGE_OFFSET
>  #define __PHYSICAL_START	CONFIG_PHYSICAL_START
>  #else
> -#define __PAGE_OFFSET		(0xC0000000UL)
> +#define __PAGE_OFFSET		((unsigned long)CONFIG_PAGE_OFFSET)
>  #define __PHYSICAL_START	((unsigned long)CONFIG_PHYSICAL_START)
>  #endif
>  #define __KERNEL_START		(__PAGE_OFFSET + __PHYSICAL_START)
> -
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