X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fum%2FKconfig.i386;h=d6cffb27fff8159b255177a09ac68e1899fd0d01;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=f6eb72d117b9e182d059fc7013a3bc1b596ebaaa;hpb=16cf0ec7408f389279d413869e94c1a351392f97;p=linux-2.6.git

diff --git a/arch/um/Kconfig.i386 b/arch/um/Kconfig.i386
index f6eb72d11..d6cffb27f 100644
--- a/arch/um/Kconfig.i386
+++ b/arch/um/Kconfig.i386
@@ -16,23 +16,42 @@ config SEMAPHORE_SLEEPERS
 	bool
 	default y
 
-config HOST_2G_2G
-	bool "2G/2G host address space split"
-	default n
+choice
+	prompt "Host memory split"
+	default HOST_VMSPLIT_3G
 	help
-	This is needed when the host on which you run has a 2G/2G memory
-	split, instead of the customary 3G/1G.
-
-	Note that to enable such a host
-	configuration, which makes sense only in some cases, you need special
-	host patches.
-
-	So, if you do not know what to do here, say 'N'.
+        This is needed when the host kernel on which you run has a non-default
+	(like 2G/2G) memory split, instead of the customary 3G/1G. If you did
+	not recompile your own kernel but use the default distro's one, you can
+	safely accept the "Default split" option.
+
+	It can be enabled on recent (>=2.6.16-rc2) vanilla kernels via
+	CONFIG_VM_SPLIT_*, or on previous kernels with special patches (-ck
+	patchset by Con Kolivas, or other ones) - option names match closely the
+	host CONFIG_VM_SPLIT_* ones.
+
+	A lower setting (where 1G/3G is lowest and 3G/1G is higher) will
+	tolerate even more "normal" host kernels, but an higher setting will be
+	stricter.
+
+	So, if you do not know what to do here, say 'Default split'.
+
+config HOST_VMSPLIT_3G
+	bool "Default split (3G/1G user/kernel host split)"
+config HOST_VMSPLIT_3G_OPT
+	bool "3G/1G user/kernel host split (for full 1G low memory)"
+config HOST_VMSPLIT_2G
+	bool "2G/2G user/kernel host split"
+config HOST_VMSPLIT_1G
+	bool "1G/3G user/kernel host split"
+endchoice
 
 config TOP_ADDR
- 	hex
- 	default 0xc0000000 if !HOST_2G_2G
- 	default 0x80000000 if HOST_2G_2G
+	hex
+	default 0xB0000000 if HOST_VMSPLIT_3G_OPT
+	default 0x78000000 if HOST_VMSPLIT_2G
+	default 0x40000000 if HOST_VMSPLIT_1G
+	default 0xC0000000
 
 config 3_LEVEL_PGTABLES
 	bool "Three-level pagetables (EXPERIMENTAL)"
@@ -48,13 +67,13 @@ config 3_LEVEL_PGTABLES
 
 config STUB_CODE
 	hex
-	default 0xbfffe000 if !HOST_2G_2G
-	default 0x7fffe000 if HOST_2G_2G
+	default 0xbfffe000 if !HOST_VMSPLIT_2G
+	default 0x7fffe000 if HOST_VMSPLIT_2G
 
 config STUB_DATA
 	hex
-	default 0xbffff000 if !HOST_2G_2G
-	default 0x7ffff000 if HOST_2G_2G
+	default 0xbffff000 if !HOST_VMSPLIT_2G
+	default 0x7ffff000 if HOST_VMSPLIT_2G
 
 config STUB_START
 	hex