diff options
| author | Bill Irwin <bill.irwin@oracle.com> | 2007-05-02 19:27:22 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:22 +0200 |
| commit | 6c2af35820f100bde7b9de8a00a76faa7af6bede (patch) | |
| tree | 296e3f01bf09007f66365bbc448c799c3493efd6 /arch | |
| parent | b466004a660c490f3bfb12be8b5ca18bfc393261 (diff) | |
[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 <wli@holomorphy.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Eric Dumazet <dada1@cosmosbay.com>
Cc: Mark Lord <lkml@rtr.ca>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/Kconfig | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig index 1a94a73fe80..c6f8d6856c4 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" endchoice @@ -578,7 +581,8 @@ endchoice config PAGE_OFFSET hex 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 |