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Subject[PATCH] Make VMSPLIT options less ambiguous
This changes VMSPLIT_2G to really mean 2G, adding VMSPLIT_2G_OPT for the 1920/2176 split. It also prevents either _OPT setting being used when PAE is enabled ( - there doesn't appear to be any patches/commits which allow non-1GB boundary VMSPLIT with PAE yet). The existing !HIGHMEM doesn't make sense, VMSPLIT_3G_OPT may be desireable for a kernel built for multiple systems some of which may only have 1GB. This will require anyone using VMSPLIT_2G to change to VMSPLIT_2G_OPT to get the same effect, but the option was badly named when it was added.

Signed-off-by: Simon Arlott <>


diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 0dfee81..e57922b 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -539,10 +539,13 @@ choice
config VMSPLIT_3G
bool "3G/1G user/kernel split"
- depends on !HIGHMEM
+ depends on !X86_PAE
bool "3G/1G user/kernel split (for full 1G low memory)"
config VMSPLIT_2G
bool "2G/2G user/kernel split"
+ config VMSPLIT_2G_OPT
+ depends on !X86_PAE
+ bool "2G/2G user/kernel split (for full 2G low memory)"
config VMSPLIT_1G
bool "1G/3G user/kernel split"
@@ -550,7 +553,8 @@ endchoice
default 0xB0000000 if VMSPLIT_3G_OPT
- default 0x78000000 if VMSPLIT_2G
+ default 0x80000000 if VMSPLIT_2G
+ default 0x78000000 if VMSPLIT_2G_OPT
default 0x40000000 if VMSPLIT_1G
default 0xC0000000

Simon Arlott

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