x86, 64-bit: Set data segments to null after switching to 64-bit mode
This prevents kernel threads from inheriting non-null segment selectors, and causing optimizations in __switch_to() to be ineffective. Signed-off-by: NBrian Gerst <brgerst@gmail.com> Cc: Tim Blechmann <tim@klingt.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Jan Beulich <JBeulich@novell.com> LKML-Reference: <1259165856-3512-1-git-send-email-brgerst@gmail.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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