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| author | Jeff Garzik <jgarzik@pobox.com> | 2005-10-30 01:58:41 -0500 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2005-10-30 01:58:41 -0500 |
| commit | fce45c1c8a6b5334fa88bbb9b1496b0699d3fef0 (patch) | |
| tree | cba2597077cf33d122f8d771bf84618cc5374cf6 /kernel/timer.c | |
| parent | 15dbb5a3f971a28040ae6cbcd8bbdf19b629fa83 (diff) | |
| parent | 81cfb8864c73230eb1c37753aba517db15cf4d8f (diff) | |
| download | op-kernel-dev-fce45c1c8a6b5334fa88bbb9b1496b0699d3fef0.zip op-kernel-dev-fce45c1c8a6b5334fa88bbb9b1496b0699d3fef0.tar.gz | |
Merge branch 'upstream'
Diffstat (limited to 'kernel/timer.c')
| -rw-r--r-- | kernel/timer.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/timer.c b/kernel/timer.c index 3ba10fa..6a2e5f8 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -752,6 +752,15 @@ static void second_overflow(void) else time_adj += (time_adj >> 2) + (time_adj >> 5); #endif +#if HZ == 250 + /* Compensate for (HZ==250) != (1 << SHIFT_HZ). + * Add 1.5625% and 0.78125% to get 255.85938; => only 0.05% error (p. 14) + */ + if (time_adj < 0) + time_adj -= (-time_adj >> 6) + (-time_adj >> 7); + else + time_adj += (time_adj >> 6) + (time_adj >> 7); +#endif #if HZ == 1000 /* Compensate for (HZ==1000) != (1 << SHIFT_HZ). * Add 1.5625% and 0.78125% to get 1023.4375; => only 0.05% error (p. 14) |
