forked from luck/tmp_suning_uos_patched
[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>
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@ -50,13 +50,15 @@ config IRQ_RELEASE_METHOD
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menu "UML-specific options"
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config MODE_TT
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bool "Tracing thread support"
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bool "Tracing thread support (DEPRECATED)"
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default n
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help
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This option controls whether tracing thread support is compiled
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into UML. This option is largely obsolete, given that skas0 provides
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into UML. This option is largely obsolete, given that skas0 provides
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skas security and performance without needing to patch the host.
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It is safe to say 'N' here.
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It is safe to say 'N' here; saying 'Y' may cause additional problems
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with the resulting binary even if you run UML in SKAS mode, and running
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in TT mode is strongly *NOT RECOMMENDED*.
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config STATIC_LINK
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bool "Force a static link"
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@ -69,6 +71,9 @@ config STATIC_LINK
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for use in a chroot jail. So, if you intend to run UML inside a
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chroot, and you disable CONFIG_MODE_TT, you probably want to say Y
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here.
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Additionally, this option enables using higher memory spaces (up to
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2.75G) for UML - disabling CONFIG_MODE_TT and enabling this option leads
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to best results for this.
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config KERNEL_HALF_GIGS
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int "Kernel address space size (in .5G units)"
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@ -85,10 +90,13 @@ config MODE_SKAS
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default y
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help
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This option controls whether skas (separate kernel address space)
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support is compiled in. If you have applied the skas patch to the
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host, then you certainly want to say Y here (and consider saying N
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to CONFIG_MODE_TT). Otherwise, it is safe to say Y. Disabling this
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option will shrink the UML binary slightly.
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support is compiled in.
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Unless you have specific needs to use TT mode (which applies almost only
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to developers), you should say Y here.
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SKAS mode will make use of the SKAS3 patch if it is applied on the host
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(and your UML will run in SKAS3 mode), but if no SKAS patch is applied
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on the host it will run in SKAS0 mode, which is anyway faster than TT
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mode.
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source "arch/um/Kconfig.arch"
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source "mm/Kconfig"
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