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[PATCH] uml: deprecate CONFIG_MODE_TT 

Deprecate TT mode in Kconfig so that users won't select it, update the
MODE_SKAS description (it was largely obsolete and misleadin) and btw describe
advantages for high memory usage with CONFIG_STATIC_LINK.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2006-10-11 01:21:41 -07:00 committed by Linus Torvalds
parent f2d57151bd
commit ca316fcf64
1 changed files with 15 additions and 7 deletions
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22
arch/um/Kconfig
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@ -50,13 +50,15 @@ config IRQ_RELEASE_METHOD
menu "UML-specific options" menu "UML-specific options"
config MODE_TT config MODE_TT
bool "Tracing thread support" bool "Tracing thread support (DEPRECATED)"
default n default n
help help
This option controls whether tracing thread support is compiled This option controls whether tracing thread support is compiled
into UML. This option is largely obsolete, given that skas0 provides into UML. This option is largely obsolete, given that skas0 provides
skas security and performance without needing to patch the host. skas security and performance without needing to patch the host.
It is safe to say 'N' here. It is safe to say 'N' here; saying 'Y' may cause additional problems
with the resulting binary even if you run UML in SKAS mode, and running
in TT mode is strongly *NOT RECOMMENDED*.
config STATIC_LINK config STATIC_LINK
bool "Force a static link" bool "Force a static link"
@ -69,6 +71,9 @@ config STATIC_LINK
for use in a chroot jail. So, if you intend to run UML inside a for use in a chroot jail. So, if you intend to run UML inside a
chroot, and you disable CONFIG_MODE_TT, you probably want to say Y chroot, and you disable CONFIG_MODE_TT, you probably want to say Y
here. here.
Additionally, this option enables using higher memory spaces (up to
2.75G) for UML - disabling CONFIG_MODE_TT and enabling this option leads
to best results for this.
config KERNEL_HALF_GIGS config KERNEL_HALF_GIGS
int "Kernel address space size (in .5G units)" int "Kernel address space size (in .5G units)"
@ -85,10 +90,13 @@ config MODE_SKAS
default y default y
help help
This option controls whether skas (separate kernel address space) This option controls whether skas (separate kernel address space)
support is compiled in. If you have applied the skas patch to the support is compiled in.
host, then you certainly want to say Y here (and consider saying N Unless you have specific needs to use TT mode (which applies almost only
to CONFIG_MODE_TT). Otherwise, it is safe to say Y. Disabling this to developers), you should say Y here.
option will shrink the UML binary slightly. SKAS mode will make use of the SKAS3 patch if it is applied on the host
(and your UML will run in SKAS3 mode), but if no SKAS patch is applied
on the host it will run in SKAS0 mode, which is anyway faster than TT
mode.
source "arch/um/Kconfig.arch" source "arch/um/Kconfig.arch"
source "mm/Kconfig" source "mm/Kconfig"