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Date: Mon, 25 Mar 2013 13:08:12 -0700
From: John Stultz <john.stultz@...aro.org>
To: lkml <linux-kernel@...r.kernel.org>
Cc: John Stultz <john.stultz@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Richard Cochran <richardcochran@...il.com>,
Prarit Bhargava <prarit@...hat.com>
Subject: [PATCH 2/8] ntp: Move do_adjtimex() and hardpps() functions to timekeeping.c
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.
*
--
1.7.10.4
--
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