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[PATCH] TIMERS: add missing compensation for HZ == 250 

Add missing compensation for (HZ == 250) != (1 << SHIFT_HZ) in
second_overflow().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
wifi-calibration
YOSHIFUJI Hideaki 2005-10-29 18:15:42 -07:00 committed by Linus Torvalds
parent 930fc45a49
commit 4b8f573b5d
1 changed files with 9 additions and 0 deletions
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9
kernel/timer.c
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@ -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)