Please revert 7212e37cbdf9 from 4.4-stable

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Hi Greg,

Could you please revert

	7212e37cbdf9 x86/platform/UV: Use efi_runtime_lock to serialise BIOS calls

from 4.4-stable?

In 4.4-stable efi_runtime_lock as defined in drivers/firmware/efi/runtime-wrappers.c
is a spinlock (given it predates commit dce48e351c0d) and commit

	f331e766c4be x86/platform/UV: Use efi_runtime_lock to serialise BIOS calls

which 7212e37cbdf9 is a backport of, needs it to be a semaphore.

Cheers,
Hedi.
--
Be careful of reading health books, you might die of a misprint.
	-- Mark Twain



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