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Date: Mon, 3 Jun 2013 10:21:38 +0800
From: Ying Xue <ying.xue@...driver.com>
To: <linux-kernel@...r.kernel.org>
CC: Ying Xue <ying.xue@...driver.com>, <tglx@...utronix.de>,
<richardcochran@...il.com>, <prarit@...hat.com>
Subject: Re: [PATCH] ntp: Move do_adjtimex() and hardpps() functions to timekeeping.c
Sorry, please ignore the patch as I send out wrong patch.
Regards,
Ying
On 06/03/2013 10:18 AM, Ying Xue wrote:
> From: John Stultz <john.stultz@...aro.org>
>
> 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@...utronix.de>
> Cc: Richard Cochran <richardcochran@...il.com>
> Cc: Prarit Bhargava <prarit@...hat.com>
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
> include/linux/timex.h | 7 -------
> kernel/time/ntp.c | 9 ++++-----
> kernel/time/ntp_internal.h | 11 +++++++++++
> kernel/time/timekeeping.c | 21 +++++++++++++++++++++
> 4 files changed, 36 insertions(+), 12 deletions(-)
> create mode 100644 kernel/time/ntp_internal.h
>
> diff --git a/include/linux/timex.h b/include/linux/timex.h
> index 5ec87c6..b3726e6 100644
> --- a/include/linux/timex.h
> +++ b/include/linux/timex.h
> @@ -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 *);
>
> diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
> index 457d2ba..8b10706 100644
> --- a/kernel/time/ntp.c
> +++ b/kernel/time/ntp.c
> @@ -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)
> diff --git a/kernel/time/ntp_internal.h b/kernel/time/ntp_internal.h
> new file mode 100644
> index 0000000..fdee80c
> --- /dev/null
> +++ b/kernel/time/ntp_internal.h
> @@ -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 */
> diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
> index c5feb7a..a138ec2 100644
> --- a/kernel/time/timekeeping.c
> +++ b/kernel/time/timekeeping.c
> @@ -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);
> @@ -1613,6 +1614,26 @@ 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.
> *
>
--
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