From: Paolo 'Blaisorblade' Giarrusso <[email protected]>
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 <[email protected]>
---
arch/um/Kconfig | 22 +++++++++++++++-------
1 files changed, 15 insertions(+), 7 deletions(-)
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 450547a..78fb619 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -50,13 +50,15 @@ config IRQ_RELEASE_METHOD
menu "UML-specific options"
config MODE_TT
- bool "Tracing thread support"
+ bool "Tracing thread support (DEPRECATED)"
default n
help
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.
- 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
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
chroot, and you disable CONFIG_MODE_TT, you probably want to say Y
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
int "Kernel address space size (in .5G units)"
@@ -85,10 +90,13 @@ config MODE_SKAS
default y
help
This option controls whether skas (separate kernel address space)
- support is compiled in. If you have applied the skas patch to the
- host, then you certainly want to say Y here (and consider saying N
- to CONFIG_MODE_TT). Otherwise, it is safe to say Y. Disabling this
- option will shrink the UML binary slightly.
+ support is compiled in.
+ Unless you have specific needs to use TT mode (which applies almost only
+ to developers), you should say Y here.
+ 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 "mm/Kconfig"
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