x86: clean up rdtsc_barrier() use
authorIngo Molnar <mingo@elte.hu>
Sat, 8 Nov 2008 19:27:00 +0000 (20:27 +0100)
committerIngo Molnar <mingo@elte.hu>
Sat, 8 Nov 2008 19:27:00 +0000 (20:27 +0100)
Impact: cleanup

Move rdtsc_barrier() use to vsyscall_64.c where it's relied on,
and point out its role in the context of its use.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

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