timekeeping: Implement a shadow timekeeper

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Use the shadow timekeeper to do the update_wall_time() adjustments and
then copy it over to the real timekeeper.

Keep the shadow timekeeper in sync when updating stuff outside of
update_wall_time().

This allows us to limit the timekeeper_seq hold time to the update of
the real timekeeper and the vsyscall data in the next patch.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>

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Thomas Gleixner 2013-02-21 22:51:40 +00:00 • committed by John Stultz

parent 7ec98e15aa

commit 48cdc135d4

1 changed files with 29 additions and 12 deletions

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kernel/time/timekeeping.c

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