timekeeping: Decouple xtime_lock from xtime seqcount

xtime_lock which serializes the update of time relevant data
structures is held over a large code pathes which results in extended
seqlock contention times on the reader side. This series decouples the
lock from the seqcount and reduces the seqcount protected sections to
those which actually update the reader visible data.

Thanks,

	tglx
---
 jiffies.c       |    4 
 ntp.c           |   16 +--
 tick-common.c   |    8 -
 tick-internal.h |    3 
 tick-sched.c    |   12 +-
 timekeeping.c   |  237 +++++++++++++++++++++++++++++++-------------------------
 6 files changed, 157 insertions(+), 123 deletions(-)


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