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ntp: Access tick_length variable via ntp_tick_length() 

Currently the NTP managed tick_length value is accessed globally,
in preparations for locking cleanups, make sure it is accessed via
a function and mark it as static.

CC: Thomas Gleixner <tglx@linutronix.de>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
John Stultz 2011-11-14 13:18:07 -08:00
parent 8357929e6a
commit ea7cf49a76
3 changed files with 12 additions and 5 deletions
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2
include/linux/timex.h
View File

@ -250,7 +250,7 @@ extern void ntp_clear(void);
#define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_INTERVAL_FREQ)
/* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */
extern u64 tick_length;
extern u64 ntp_tick_length(void);
extern void second_overflow(void);
extern int do_adjtimex(struct timex *);

9
kernel/time/ntp.c
View File

@ -28,7 +28,7 @@ unsigned long tick_usec = TICK_USEC;
/* ACTHZ period (nsecs): */
unsigned long tick_nsec;
u64 tick_length;
static u64 tick_length;
static u64 tick_length_base;
static struct hrtimer leap_timer;
@ -360,6 +360,13 @@ void ntp_clear(void)
pps_clear();
}
u64 ntp_tick_length(void)
{
return tick_length;
}
/*
* Leap second processing. If in leap-insert state at the end of the
* day, the system clock is set back one second; if in leap-delete

6
kernel/time/timekeeping.c
View File

@ -811,7 +811,7 @@ static __always_inline int timekeeping_bigadjust(s64 error, s64 *interval,
* Now calculate the error in (1 << look_ahead) ticks, but first
* remove the single look ahead already included in the error.
*/
tick_error = tick_length >> (timekeeper.ntp_error_shift + 1);
tick_error = ntp_tick_length() >> (timekeeper.ntp_error_shift + 1);
tick_error -= timekeeper.xtime_interval >> 1;
error = ((error - tick_error) >> look_ahead) + tick_error;
@ -994,7 +994,7 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
timekeeper.raw_time.tv_nsec = raw_nsecs;
/* Accumulate error between NTP and clock interval */
timekeeper.ntp_error += tick_length << shift;
timekeeper.ntp_error += ntp_tick_length() << shift;
timekeeper.ntp_error -=
(timekeeper.xtime_interval + timekeeper.xtime_remainder) <<
(timekeeper.ntp_error_shift + shift);
@ -1042,7 +1042,7 @@ static void update_wall_time(void)
shift = ilog2(offset) - ilog2(timekeeper.cycle_interval);
shift = max(0, shift);
/* Bound shift to one less then what overflows tick_length */
maxshift = (8*sizeof(tick_length) - (ilog2(tick_length)+1)) - 1;
maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1;
shift = min(shift, maxshift);
while (offset >= timekeeper.cycle_interval) {
offset = logarithmic_accumulation(offset, shift);