android_kernel_xiaomi_sm8350/kernel/time
Roman Zippel 10a398d04c time: remove obsolete CLOCK_TICK_ADJUST
The first version of the ntp_interval/tick_length inconsistent usage patch was
recently merged as bbe4d18ac2

http://git.kernel.org/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=bbe4d18ac2e058c56adb0cd71f49d9ed3216a405

While the fix did greatly improve the situation, it was correctly pointed out
by Roman that it does have a small bug: If the users change clocksources after
the system has been running and NTP has made corrections, the correctoins made
against the old clocksource will be applied against the new clocksource,
causing error.

The second attempt, which corrects the issue in the NTP_INTERVAL_LENGTH
definition has also made it up-stream as commit
e13a2e61dd

http://git.kernel.org/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e13a2e61dd5152f5499d2003470acf9c838eab84

Roman has correctly pointed out that CLOCK_TICK_ADJUST is calculated
based on the PIT's frequency, and isn't really relevant to non-PIT
driven clocksources (that is, clocksources other then jiffies and pit).

This patch reverts both of those changes, and simply removes
CLOCK_TICK_ADJUST.

This does remove the granularity error correction for users of PIT and Jiffies
clocksource users, but the granularity error but for the majority of users, it
should be within the 500ppm range NTP can accommodate for.

For systems that have granularity errors greater then 500ppm, the
"ntp_tick_adj=" boot option can be used to compensate.

[johnstul@us.ibm.com: provided changelog]
[mattilinnanvuori@yahoo.com: maek ntp_tick_adj static]
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Acked-by: john stultz <johnstul@us.ibm.com>
Signed-off-by: Matti Linnanvuori <mattilinnanvuori@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-03-09 08:42:57 +01:00
..
clockevents.c time: fix typo in comments 2008-02-08 09:22:29 -08:00
clocksource.c clocksource: remove redundant code 2008-02-08 09:22:29 -08:00
jiffies.c
Kconfig
Makefile
ntp.c time: remove obsolete CLOCK_TICK_ADJUST 2008-03-09 08:42:57 +01:00
tick-broadcast.c timer: clean up tick-broadcast.c 2008-01-30 13:30:01 +01:00
tick-common.c
tick-internal.h timer: clean up tick-broadcast.c 2008-01-30 13:30:01 +01:00
tick-oneshot.c
tick-sched.c time: don't touch an offlined CPU's ts->tick_stopped in tick_cancel_sched_timer() 2008-03-09 08:42:57 +01:00
timekeeping.c time: remove obsolete CLOCK_TICK_ADJUST 2008-03-09 08:42:57 +01:00
timer_list.c timer_list: print relative expiry time signed 2008-02-17 17:29:38 +01:00
timer_stats.c time: more timer related cleanups 2008-01-30 13:30:00 +01:00