ent a7bf0bd5e6af7fe69342dabf2a3b721f0163469a
author Glauber Costa <gcosta@redhat.com> 1211937774 -0700
committer Ingo Molnar <mingo@elte.hu> 1215514094 +0200

x86: use stack_start in x86_64

call x86_64's init_rsp stack_start, just as i386 does.
Put a zeroed stack segment for consistency. With this,
we can eliminate one ugly ifdef in smpboot.c.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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