tree 8624096baed40f8f89e757b2d170a7b4d1844575
parent 49c93e84d8b2d602a07c302c7e3cd4fa09095fbb
author Jordan Hargrave <jordan_hargrave@dell.com> 1144432218 +0200
committer Linus Torvalds <torvalds@g5.osdl.org> 1144608833 -0700

[PATCH] x86_64: Fix drift with HPET timer enabled

If the HPET timer is enabled, the clock can drift by ~3 seconds a day.
This is due to the HPET timer not being initialized with the correct
setting (still using PIT count).

If HZ changes, this drift can become even more pronounced.

HPET patch initializes tick_nsec with correct tick_nsec settings for
HPET timer.

Vojtech comments:

  "It's not entirely correct (it assumes the HPET ticks totally
   exactly), but it's significantly better than assuming the PIT error
   there."

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>