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| author | Roman Zippel <zippel@linux-m68k.org> | 2008-09-22 23:42:44 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-09-24 17:33:13 +0200 |
| commit | d40e944c25fb4642adb2a4c580a48218a9f3f824 (patch) | |
| tree | 9be7107440704a84d17f9dde12991915931c5279 /drivers/rtc/rtc-ds1511.c | |
| parent | timekeeping: fix rounding problem during clock update (diff) | |
| download | linux-d40e944c25fb4642adb2a4c580a48218a9f3f824.tar.xz linux-d40e944c25fb4642adb2a4c580a48218a9f3f824.zip | |
ntp: improve adjtimex frequency rounding
Change PPM_SCALE_INV_SHIFT so that it doesn't throw away any input bits
(19 is the amount of the factor 2 in PPM_SCALE), the output frequency
can then be calculated back to its input value, as the inverse divide
produce a slightly larger value, which is then correctly rounded by the
final shift.
Reported-by: Martin Ziegler <ziegler@uni-freiburg.de>
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/rtc/rtc-ds1511.c')
0 files changed, 0 insertions, 0 deletions