Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ca316fcf authored by Paolo 'Blaisorblade' Giarrusso's avatar Paolo 'Blaisorblade' Giarrusso Committed by Linus Torvalds
Browse files

[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: default avatarPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent f2d57151

arch/um/Kconfig

+15 −7
Original line number Diff line number Diff line
@@ -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

	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"