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SubjectRe: [RFC PATCH 04/33] Add XEN config options and disable unsupported config options.

> The disabled config options are:
> - DOUBLEFAULT: are trapped by Xen and not virtualized
> - HZ: defaults to 100 in Xen VMs


this makes no real sense with dynamic ticks coming up... HZ=1000 should
be perfectly fine then...

> config KEXEC
> bool "kexec system call (EXPERIMENTAL)"
> - depends on EXPERIMENTAL
> + depends on EXPERIMENTAL && !X86_XEN
> help
> kexec is a system call that implements the ability to shutdown your
> current kernel, and to start another kernel. It is like a reboot

hmmm why is kexec incompatible with xen? Don't you want to support crash
dumps from guests?

> + bool
> + default y
> + help
> + Fakes out a shadow mode kernel
> +

this probably wants a better description...

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