[Lguest] [patch] make map_switcher() an option for archs that don't need it

[Jes Sorensen]

Hi,

On some architectures, we won't need to map in the switcher, but instead
it can be stuck into the vdso/gate-page.

For ia64 the kernel is mapped using identity mapping and we don't need
to fiddle with page tables when switching to the host, instead my plan
is to treat it as a variation of the fast syscalls we already have for
normal userland calls.

Cheers,
Jes

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