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Message-Id: <1347919501-64534-2-git-send-email-john.stultz@linaro.org>
Date: Mon, 17 Sep 2012 18:04:56 -0400
From: John Stultz <john.stultz@...aro.org>
To: linux-kernel <linux-kernel@...r.kernel.org>
Cc: John Stultz <john.stultz@...aro.org>,
Tony Luck <tony.luck@...el.com>,
Paul Mackerras <paulus@...ba.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Andy Lutomirski <luto@...capital.net>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Paul Turner <pjt@...gle.com>,
Steven Rostedt <rostedt@...dmis.org>,
Richard Cochran <richardcochran@...il.com>,
Prarit Bhargava <prarit@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 1/6][RFC] time: Move timekeeper structure to timekeeper_internal.h for vsyscall changes
We're going to need to access the timekeeper in update_vsyscall,
so make the structure available for those who need it.
Cc: Tony Luck <tony.luck@...el.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Paul Turner <pjt@...gle.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
include/linux/timekeeper_internal.h | 68 +++++++++++++++++++++++++++++++++++
kernel/time/timekeeping.c | 56 +----------------------------
2 files changed, 69 insertions(+), 55 deletions(-)
create mode 100644 include/linux/timekeeper_internal.h
diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h
new file mode 100644
index 0000000..8ba43fa
--- /dev/null
+++ b/include/linux/timekeeper_internal.h
@@ -0,0 +1,68 @@
+/*
+ * You SHOULD NOT be including this unless you're vsyscall
+ * handling code or timekeeping internal code!
+ */
+
+#ifndef _LINUX_TIMEKEEPER_INTERNAL_H
+#define _LINUX_TIMEKEEPER_INTERNAL_H
+
+#include <linux/clocksource.h>
+#include <linux/jiffies.h>
+#include <linux/time.h>
+
+/* Structure holding internal timekeeping values. */
+struct timekeeper {
+ /* Current clocksource used for timekeeping. */
+ struct clocksource *clock;
+ /* NTP adjusted clock multiplier */
+ u32 mult;
+ /* The shift value of the current clocksource. */
+ u32 shift;
+ /* Number of clock cycles in one NTP interval. */
+ cycle_t cycle_interval;
+ /* Number of clock shifted nano seconds in one NTP interval. */
+ u64 xtime_interval;
+ /* shifted nano seconds left over when rounding cycle_interval */
+ s64 xtime_remainder;
+ /* Raw nano seconds accumulated per NTP interval. */
+ u32 raw_interval;
+
+ /* Current CLOCK_REALTIME time in seconds */
+ u64 xtime_sec;
+ /* Clock shifted nano seconds */
+ u64 xtime_nsec;
+
+ /* Difference between accumulated time and NTP time in ntp
+ * shifted nano seconds. */
+ s64 ntp_error;
+ /* Shift conversion between clock shifted nano seconds and
+ * ntp shifted nano seconds. */
+ u32 ntp_error_shift;
+
+ /*
+ * wall_to_monotonic is what we need to add to xtime (or xtime corrected
+ * for sub jiffie times) to get to monotonic time. Monotonic is pegged
+ * at zero at system boot time, so wall_to_monotonic will be negative,
+ * however, we will ALWAYS keep the tv_nsec part positive so we can use
+ * the usual normalization.
+ *
+ * wall_to_monotonic is moved after resume from suspend for the
+ * monotonic time not to jump. We need to add total_sleep_time to
+ * wall_to_monotonic to get the real boot based time offset.
+ *
+ * - wall_to_monotonic is no longer the boot time, getboottime must be
+ * used instead.
+ */
+ struct timespec wall_to_monotonic;
+ /* Offset clock monotonic -> clock realtime */
+ ktime_t offs_real;
+ /* time spent in suspend */
+ struct timespec total_sleep_time;
+ /* Offset clock monotonic -> clock boottime */
+ ktime_t offs_boot;
+ /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
+ struct timespec raw_time;
+ /* Seqlock for all timekeeper values */
+ seqlock_t lock;
+};
+#endif /* _LINUX_TIMEKEEPER_INTERNAL_H */
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 34e5eac..61f5fba 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -8,6 +8,7 @@
*
*/
+#include <linux/timekeeper_internal.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/percpu.h>
@@ -21,61 +22,6 @@
#include <linux/tick.h>
#include <linux/stop_machine.h>
-/* Structure holding internal timekeeping values. */
-struct timekeeper {
- /* Current clocksource used for timekeeping. */
- struct clocksource *clock;
- /* NTP adjusted clock multiplier */
- u32 mult;
- /* The shift value of the current clocksource. */
- u32 shift;
- /* Number of clock cycles in one NTP interval. */
- cycle_t cycle_interval;
- /* Number of clock shifted nano seconds in one NTP interval. */
- u64 xtime_interval;
- /* shifted nano seconds left over when rounding cycle_interval */
- s64 xtime_remainder;
- /* Raw nano seconds accumulated per NTP interval. */
- u32 raw_interval;
-
- /* Current CLOCK_REALTIME time in seconds */
- u64 xtime_sec;
- /* Clock shifted nano seconds */
- u64 xtime_nsec;
-
- /* Difference between accumulated time and NTP time in ntp
- * shifted nano seconds. */
- s64 ntp_error;
- /* Shift conversion between clock shifted nano seconds and
- * ntp shifted nano seconds. */
- u32 ntp_error_shift;
-
- /*
- * wall_to_monotonic is what we need to add to xtime (or xtime corrected
- * for sub jiffie times) to get to monotonic time. Monotonic is pegged
- * at zero at system boot time, so wall_to_monotonic will be negative,
- * however, we will ALWAYS keep the tv_nsec part positive so we can use
- * the usual normalization.
- *
- * wall_to_monotonic is moved after resume from suspend for the
- * monotonic time not to jump. We need to add total_sleep_time to
- * wall_to_monotonic to get the real boot based time offset.
- *
- * - wall_to_monotonic is no longer the boot time, getboottime must be
- * used instead.
- */
- struct timespec wall_to_monotonic;
- /* Offset clock monotonic -> clock realtime */
- ktime_t offs_real;
- /* time spent in suspend */
- struct timespec total_sleep_time;
- /* Offset clock monotonic -> clock boottime */
- ktime_t offs_boot;
- /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
- struct timespec raw_time;
- /* Seqlock for all timekeeper values */
- seqlock_t lock;
-};
static struct timekeeper timekeeper;
--
1.7.9.5
--
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