diff options
| author | Jeff Garzik <jgarzik@pobox.com> | 2005-10-30 01:56:31 -0500 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2005-10-30 01:56:31 -0500 |
| commit | 81cfb8864c73230eb1c37753aba517db15cf4d8f (patch) | |
| tree | 649ff25543834cf9983ea41b93126bea97d75475 /kernel/timer.c | |
| parent | 0169e284f6b6b263cc7c2ed25986b96cd6fda610 (diff) | |
| parent | 9f75e1eff3edb2bb07349b94c28f4f2a6c66ca43 (diff) | |
Merge branch 'master'
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 3ba10fa35b60..6a2e5f8dc725 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) |