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ntp: Move do_adjtimex() and hardpps() functions to timekeeping.c

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In preparation for changing the ntp locking rules, move
do_adjtimex and hardpps accessor functions to timekeeping.c,
but keep the code logic in ntp.c.

This patch also introduces a ntp_internal.h file so timekeeping
specific interfaces of ntp.c can be more limitedly shared with
timekeeping.c.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
John Stultz 2013-03-22 11:31:29 -07:00
parent ad460967a2
commit aa6f9c595d
4 changed files with 36 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/timex.h
View File

@ -125,9 +125,6 @@
extern unsigned long tick_usec; /* USER_HZ period (usec) */
extern unsigned long tick_nsec; /* SHIFTED_HZ period (nsec) */
extern void ntp_init(void);
extern void ntp_clear(void);
/* Required to safely shift negative values */
#define shift_right(x, s) ({ \
__typeof__(x) __x = (x); \
@ -140,10 +137,6 @@ extern void ntp_clear(void);
#define NTP_INTERVAL_FREQ (HZ)
#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 ntp_tick_length(void);
extern int second_overflow(unsigned long secs);
extern int do_adjtimex(struct timex *);
extern void hardpps(const struct timespec *, const struct timespec *);

9
kernel/time/ntp.c
View File

@ -18,6 +18,7 @@
#include <linux/rtc.h>
#include "tick-internal.h"
#include "ntp_internal.h"
/*
* NTP timekeeping variables:
@ -661,7 +662,7 @@ int ntp_validate_timex(struct timex *txc)
* adjtimex mainly allows reading (and writing, if superuser) of
* kernel time-keeping variables. used by xntpd.
*/
int do_adjtimex(struct timex *txc)
int __do_adjtimex(struct timex *txc)
{
struct timespec ts;
u32 time_tai, orig_tai;
@ -911,7 +912,7 @@ static void hardpps_update_phase(long error)
}
/*
* hardpps() - discipline CPU clock oscillator to external PPS signal
* __hardpps() - discipline CPU clock oscillator to external PPS signal
*
* This routine is called at each PPS signal arrival in order to
* discipline the CPU clock oscillator to the PPS signal. It takes two
@ -922,7 +923,7 @@ static void hardpps_update_phase(long error)
* This code is based on David Mills's reference nanokernel
* implementation. It was mostly rewritten but keeps the same idea.
*/
void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
void __hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
{
struct pps_normtime pts_norm, freq_norm;
unsigned long flags;
@ -976,8 +977,6 @@ void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
raw_spin_unlock_irqrestore(&ntp_lock, flags);
}
EXPORT_SYMBOL(hardpps);
#endif /* CONFIG_NTP_PPS */
static int __init ntp_tick_adj_setup(char *str)

11
kernel/time/ntp_internal.h Normal file
View File

@ -0,0 +1,11 @@
#ifndef _LINUX_NTP_INTERNAL_H
#define _LINUX_NTP_INTERNAL_H
extern void ntp_init(void);
extern void ntp_clear(void);
/* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */
extern u64 ntp_tick_length(void);
extern int second_overflow(unsigned long secs);
extern int __do_adjtimex(struct timex *);
extern void __hardpps(const struct timespec *, const struct timespec *);
#endif /* _LINUX_NTP_INTERNAL_H */

21
kernel/time/timekeeping.c
View File

@ -24,6 +24,7 @@
#include <linux/pvclock_gtod.h>
#include "tick-internal.h"
#include "ntp_internal.h"
static struct timekeeper timekeeper;
static DEFINE_RAW_SPINLOCK(timekeeper_lock);
@ -1612,6 +1613,26 @@ ktime_t ktime_get_monotonic_offset(void)
}
EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset);
/**
* do_adjtimex() - Accessor function to NTP __do_adjtimex function
*/
int do_adjtimex(struct timex *txc)
{
return __do_adjtimex(txc);
}
#ifdef CONFIG_NTP_PPS
/**
* hardpps() - Accessor function to NTP __hardpps function
*/
void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
{
__hardpps(phase_ts, raw_ts);
}
EXPORT_SYMBOL(hardpps);
#endif
/**
* xtime_update() - advances the timekeeping infrastructure
* @ticks: number of ticks, that have elapsed since the last call.