Commit:     6c2af35820f100bde7b9de8a00a76faa7af6bede
Parent:     b466004a660c490f3bfb12be8b5ca18bfc393261
Author:     Bill Irwin <[EMAIL PROTECTED]>
AuthorDate: Wed May 2 19:27:22 2007 +0200
Committer:  Andi Kleen <[EMAIL PROTECTED]>
CommitDate: Wed May 2 19:27:22 2007 +0200

    [PATCH] i386: Add missing !X86_PAE dependincy to the 2G/2G split.
    Only 1GB-aligned kernel/user splits are now handled for PAE. The
    2GB/2GB split attempts to avoid aliasing vmallocspace with the 1:1
    mapping for physical memory by using an actual split of 1.875/2.125
    to accommodate 128MB of vmallocspace out of what would otherwise
    be a full 2GB for userspace. That attempt disturbs the alignment
    required by PAE for 2GB/2GB splits, and furthermore does not provide
    a 2GB/2GB split as advertised.
    This patch resolves the issues here in two manners. The first is
    by providing a true 2GB/2GB split in addition to the 1.875/2.125
    split. The second is by renaming the 1.875/2.125 split to
    CONFIG_VMSPLIT_2G_OPT analogously to CONFIG_VMSPLIT_3G_OPT, which
    performs a similar manuever to avoid aliasing vmallocspace with
    the 1:1 mapping for physical memory around the 3GB boundary. With
    the 1.875/2.125 split properly-named, its config option is then
    tagged as depending on !HIGHMEM to express the PAE implementation's
    current inability to deal with such unaligned splits.
    This patch is essentially a combination of two patches, one written
    by Eric Biederman and the other by Eric Dumazet. If they could add
    their Signed-off-by: to this, I'd be much obliged.
    Signed-off-by: William Irwin <[EMAIL PROTECTED]>
    Signed-off-by: Andi Kleen <[EMAIL PROTECTED]>
    Cc: Eric Dumazet <[EMAIL PROTECTED]>
    Cc: Mark Lord <[EMAIL PROTECTED]>
    Cc: Eric W. Biederman <[EMAIL PROTECTED]>
    Cc: Andi Kleen <[EMAIL PROTECTED]>
 arch/i386/Kconfig |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 1a94a73..c6f8d68 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -571,6 +571,9 @@ choice
                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 !HIGHMEM
+               bool "2G/2G user/kernel split (for full 2G low memory)"
        config VMSPLIT_1G
                bool "1G/3G user/kernel split"
@@ -578,7 +581,8 @@ 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
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