The patch titled
uml: deprecate CONFIG_MODE_TT
has been added to the -mm tree. Its filename is
uml-deprecate-config_mode_tt.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: uml: deprecate CONFIG_MODE_TT
From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>
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@xxxxxxxx>
Cc: Jeff Dike <jdike@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/um/Kconfig | 22 +++++++++++++++-------
1 files changed, 15 insertions(+), 7 deletions(-)
diff -puN arch/um/Kconfig~uml-deprecate-config_mode_tt arch/um/Kconfig
--- a/arch/um/Kconfig~uml-deprecate-config_mode_tt
+++ a/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"
_
Patches currently in -mm which might be from blaisorblade@xxxxxxxx are
uml-fix-compilation-options-for-user_objs.patch
uml-revert-wrong-patch.patch
uml-correct-removal-of-pte_mkexec.patch
uml-readd-forgot-prototype.patch
uml-make-tt-mode-compile-after-setjmp-related-changes.patch
uml-make-uml_setjmp-always-safe.patch
uml-fix-processor-selection-to-exclude-unsupported-processors-and-features.patch
uml-fix-uname-under-setarch-i386.patch
uml-declare-in-kconfig-our-partial-lockdep-support.patch
uml-allow-using-again-x86-x86_64-crypto-code.patch
uml-asm-offsets-duplication-removal.patch
uml-remove-duplicate-export.patch
uml-deprecate-config_mode_tt.patch
uml-allow-finer-tuning-for-host-vmsplit-setting.patch
-
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