[GIT PULL] timer changes for v3.4
From: Ingo Molnar
Date: Mon Mar 19 2012 - 12:09:58 EST
Linus,
Please pull the latest timers-core-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers-core-for-linus
HEAD: a078c6d0e6288fad6d83fb6d5edd91ddb7b6ab33 ntp: Fix integer overflow when setting time
Thanks,
Ingo
------------------>
Arjan van de Ven (1):
clocksource: Load the ACPI PM clocksource asynchronously
Frederic Weisbecker (2):
nohz: Remove ts->Einidle checks before restarting the tick
timer: Fix bad idle check on irq entry
Ingo Molnar (1):
clocksource: scx200_hrt: Fix the build
Jan Beulich (1):
x86/time: Eliminate unused irq0_irqs counter
Jens Rottmann (2):
cs5535-clockevt: Don't ignore MFGPT on SMP-capable kernels
cs5535-clockevt: Allow the MFGPT IRQ to be shared
Jim Cromie (1):
clocksource: scx200_hrt: use pr_<level> instead of printk
John Stultz (12):
rtc: Avoid setting alarm to a time in the past
time: Move total_sleep_time into the timekeeper structure
time: Move wall_to_monotonic into the timekeeper structure
time: Move xtime into timekeeeper structure
time: Move raw_time into timekeeper structure
time: Cleanup global variables and move them to the top
time: Add timekeeper lock
ntp: Cleanup timex.h
ntp: Access tick_length variable via ntp_tick_length()
ntp: Add ntp_lock to replace xtime_locking
time: Remove most of xtime_lock usage in timekeeping.c
clocksource: scx200_hrt: Convert scx200 to use clocksource_register_hz
Julia Lawall (1):
clocksource: cyclone: Add missing iounmap
Michal Hocko (1):
nohz: Remove update_ts_time_stat from tick_nohz_start_idle
NeilBrown (1):
rtc: Expire alarms after the time is set. (v2)
Rabin Vincent (1):
rtc: Disable the alarm in the hardware (v2)
Sasha Levin (2):
math: Introduce div64_long
ntp: Fix integer overflow when setting time
Suresh Siddha (2):
clockevents: Leave the broadcast device in shutdown mode when not needed
x86/tsc: Reduce the TSC sync check time for core-siblings
Thomas Gleixner (2):
time: Reorder so the hot data is together
time: Move common updates to a function
Yong Zhang (2):
clocksource: dbx500: convert to clocksource_register_hz()
clocksource: Get rid of clocksource_calc_mult_shift()
arch/x86/include/asm/hardirq.h | 1 -
arch/x86/kernel/time.c | 3 -
arch/x86/kernel/tsc_sync.c | 29 ++-
drivers/clocksource/acpi_pm.c | 24 ++-
drivers/clocksource/clksrc-dbx500-prcmu.c | 5 +-
drivers/clocksource/cs5535-clockevt.c | 3 +-
drivers/clocksource/cyclone.c | 2 +-
drivers/clocksource/scx200_hrt.c | 24 +--
drivers/rtc/interface.c | 30 +++-
include/linux/clocksource.h | 7 -
include/linux/math64.h | 4 +
include/linux/timex.h | 17 +--
kernel/softirq.c | 2 +-
kernel/time/ntp.c | 85 ++++++--
kernel/time/tick-broadcast.c | 4 +
kernel/time/tick-sched.c | 17 +-
kernel/time/timekeeping.c | 338 ++++++++++++++++-------------
17 files changed, 343 insertions(+), 252 deletions(-)
diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index da0b3ca..382f75d 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -7,7 +7,6 @@
typedef struct {
unsigned int __softirq_pending;
unsigned int __nmi_count; /* arch dependent */
- unsigned int irq0_irqs;
#ifdef CONFIG_X86_LOCAL_APIC
unsigned int apic_timer_irqs; /* arch dependent */
unsigned int irq_spurious_count;
diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
index dd5fbf4..c6eba2b 100644
--- a/arch/x86/kernel/time.c
+++ b/arch/x86/kernel/time.c
@@ -57,9 +57,6 @@ EXPORT_SYMBOL(profile_pc);
*/
static irqreturn_t timer_interrupt(int irq, void *dev_id)
{
- /* Keep nmi watchdog up to date */
- inc_irq_stat(irq0_irqs);
-
global_clock_event->event_handler(global_clock_event);
/* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
index 9eba29b..fc25e60 100644
--- a/arch/x86/kernel/tsc_sync.c
+++ b/arch/x86/kernel/tsc_sync.c
@@ -42,7 +42,7 @@ static __cpuinitdata int nr_warps;
/*
* TSC-warp measurement loop running on both CPUs:
*/
-static __cpuinit void check_tsc_warp(void)
+static __cpuinit void check_tsc_warp(unsigned int timeout)
{
cycles_t start, now, prev, end;
int i;
@@ -51,9 +51,9 @@ static __cpuinit void check_tsc_warp(void)
start = get_cycles();
rdtsc_barrier();
/*
- * The measurement runs for 20 msecs:
+ * The measurement runs for 'timeout' msecs:
*/
- end = start + tsc_khz * 20ULL;
+ end = start + (cycles_t) tsc_khz * timeout;
now = start;
for (i = 0; ; i++) {
@@ -99,6 +99,25 @@ static __cpuinit void check_tsc_warp(void)
}
/*
+ * If the target CPU coming online doesn't have any of its core-siblings
+ * online, a timeout of 20msec will be used for the TSC-warp measurement
+ * loop. Otherwise a smaller timeout of 2msec will be used, as we have some
+ * information about this socket already (and this information grows as we
+ * have more and more logical-siblings in that socket).
+ *
+ * Ideally we should be able to skip the TSC sync check on the other
+ * core-siblings, if the first logical CPU in a socket passed the sync test.
+ * But as the TSC is per-logical CPU and can potentially be modified wrongly
+ * by the bios, TSC sync test for smaller duration should be able
+ * to catch such errors. Also this will catch the condition where all the
+ * cores in the socket doesn't get reset at the same time.
+ */
+static inline unsigned int loop_timeout(int cpu)
+{
+ return (cpumask_weight(cpu_core_mask(cpu)) > 1) ? 2 : 20;
+}
+
+/*
* Source CPU calls into this - it waits for the freshly booted
* target CPU to arrive and then starts the measurement:
*/
@@ -135,7 +154,7 @@ void __cpuinit check_tsc_sync_source(int cpu)
*/
atomic_inc(&start_count);
- check_tsc_warp();
+ check_tsc_warp(loop_timeout(cpu));
while (atomic_read(&stop_count) != cpus-1)
cpu_relax();
@@ -183,7 +202,7 @@ void __cpuinit check_tsc_sync_target(void)
while (atomic_read(&start_count) != cpus)
cpu_relax();
- check_tsc_warp();
+ check_tsc_warp(loop_timeout(smp_processor_id()));
/*
* Ok, we are done:
diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index 6b5cf02..82e8820 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c
@@ -23,6 +23,7 @@
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>
+#include <linux/async.h>
#include <asm/io.h>
/*
@@ -179,17 +180,15 @@ static int verify_pmtmr_rate(void)
/* Number of reads we try to get two different values */
#define ACPI_PM_READ_CHECKS 10000
-static int __init init_acpi_pm_clocksource(void)
+static void __init acpi_pm_clocksource_async(void *unused, async_cookie_t cookie)
{
cycle_t value1, value2;
unsigned int i, j = 0;
- if (!pmtmr_ioport)
- return -ENODEV;
/* "verify" this timing source: */
for (j = 0; j < ACPI_PM_MONOTONICITY_CHECKS; j++) {
- udelay(100 * j);
+ usleep_range(100 * j, 100 * j + 100);
value1 = clocksource_acpi_pm.read(&clocksource_acpi_pm);
for (i = 0; i < ACPI_PM_READ_CHECKS; i++) {
value2 = clocksource_acpi_pm.read(&clocksource_acpi_pm);
@@ -203,25 +202,34 @@ static int __init init_acpi_pm_clocksource(void)
" 0x%#llx, 0x%#llx - aborting.\n",
value1, value2);
pmtmr_ioport = 0;
- return -EINVAL;
+ return;
}
if (i == ACPI_PM_READ_CHECKS) {
printk(KERN_INFO "PM-Timer failed consistency check "
" (0x%#llx) - aborting.\n", value1);
pmtmr_ioport = 0;
- return -ENODEV;
+ return;
}
}
if (verify_pmtmr_rate() != 0){
pmtmr_ioport = 0;
- return -ENODEV;
+ return;
}
- return clocksource_register_hz(&clocksource_acpi_pm,
+ clocksource_register_hz(&clocksource_acpi_pm,
PMTMR_TICKS_PER_SEC);
}
+static int __init init_acpi_pm_clocksource(void)
+{
+ if (!pmtmr_ioport)
+ return -ENODEV;
+
+ async_schedule(acpi_pm_clocksource_async, NULL);
+ return 0;
+}
+
/* We use fs_initcall because we want the PCI fixups to have run
* but we still need to load before device_initcall
*/
diff --git a/drivers/clocksource/clksrc-dbx500-prcmu.c b/drivers/clocksource/clksrc-dbx500-prcmu.c
index fb6b6d2..c26c369 100644
--- a/drivers/clocksource/clksrc-dbx500-prcmu.c
+++ b/drivers/clocksource/clksrc-dbx500-prcmu.c
@@ -52,7 +52,6 @@ static struct clocksource clocksource_dbx500_prcmu = {
.name = "dbx500-prcmu-timer",
.rating = 300,
.read = clksrc_dbx500_prcmu_read,
- .shift = 10,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
@@ -90,7 +89,5 @@ void __init clksrc_dbx500_prcmu_init(void __iomem *base)
setup_sched_clock(dbx500_prcmu_sched_clock_read,
32, RATE_32K);
#endif
- clocksource_calc_mult_shift(&clocksource_dbx500_prcmu,
- RATE_32K, SCHED_CLOCK_MIN_WRAP);
- clocksource_register(&clocksource_dbx500_prcmu);
+ clocksource_register_hz(&clocksource_dbx500_prcmu, RATE_32K);
}
diff --git a/drivers/clocksource/cs5535-clockevt.c b/drivers/clocksource/cs5535-clockevt.c
index b7dab32..540795c 100644
--- a/drivers/clocksource/cs5535-clockevt.c
+++ b/drivers/clocksource/cs5535-clockevt.c
@@ -100,7 +100,6 @@ static struct clock_event_device cs5535_clockevent = {
.set_mode = mfgpt_set_mode,
.set_next_event = mfgpt_next_event,
.rating = 250,
- .cpumask = cpu_all_mask,
.shift = 32
};
@@ -133,7 +132,7 @@ static irqreturn_t mfgpt_tick(int irq, void *dev_id)
static struct irqaction mfgptirq = {
.handler = mfgpt_tick,
- .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TIMER,
+ .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TIMER | IRQF_SHARED,
.name = DRV_NAME,
};
diff --git a/drivers/clocksource/cyclone.c b/drivers/clocksource/cyclone.c
index 72f811f..9e0998f 100644
--- a/drivers/clocksource/cyclone.c
+++ b/drivers/clocksource/cyclone.c
@@ -55,11 +55,11 @@ static int __init init_cyclone_clocksource(void)
}
/* even on 64bit systems, this is only 32bits: */
base = readl(reg);
+ iounmap(reg);
if (!base) {
printk(KERN_ERR "Summit chipset: Could not find valid CBAR value.\n");
return -ENODEV;
}
- iounmap(reg);
/* setup PMCC: */
offset = base + CYCLONE_PMCC_OFFSET;
diff --git a/drivers/clocksource/scx200_hrt.c b/drivers/clocksource/scx200_hrt.c
index 27f4d96..64f9e82 100644
--- a/drivers/clocksource/scx200_hrt.c
+++ b/drivers/clocksource/scx200_hrt.c
@@ -49,9 +49,6 @@ static cycle_t read_hrt(struct clocksource *cs)
return (cycle_t) inl(scx200_cb_base + SCx200_TIMER_OFFSET);
}
-#define HRT_SHIFT_1 22
-#define HRT_SHIFT_27 26
-
static struct clocksource cs_hrt = {
.name = "scx200_hrt",
.rating = 250,
@@ -63,6 +60,7 @@ static struct clocksource cs_hrt = {
static int __init init_hrt_clocksource(void)
{
+ u32 freq;
/* Make sure scx200 has initialized the configuration block */
if (!scx200_cb_present())
return -ENODEV;
@@ -71,7 +69,7 @@ static int __init init_hrt_clocksource(void)
if (!request_region(scx200_cb_base + SCx200_TIMER_OFFSET,
SCx200_TIMER_SIZE,
"NatSemi SCx200 High-Resolution Timer")) {
- printk(KERN_WARNING NAME ": unable to lock timer region\n");
+ pr_warn("unable to lock timer region\n");
return -ENODEV;
}
@@ -79,19 +77,13 @@ static int __init init_hrt_clocksource(void)
outb(HR_TMEN | (mhz27 ? HR_TMCLKSEL : 0),
scx200_cb_base + SCx200_TMCNFG_OFFSET);
- if (mhz27) {
- cs_hrt.shift = HRT_SHIFT_27;
- cs_hrt.mult = clocksource_hz2mult((HRT_FREQ + ppm) * 27,
- cs_hrt.shift);
- } else {
- cs_hrt.shift = HRT_SHIFT_1;
- cs_hrt.mult = clocksource_hz2mult(HRT_FREQ + ppm,
- cs_hrt.shift);
- }
- printk(KERN_INFO "enabling scx200 high-res timer (%s MHz +%d ppm)\n",
- mhz27 ? "27":"1", ppm);
+ freq = (HRT_FREQ + ppm);
+ if (mhz27)
+ freq *= 27;
+
+ pr_info("enabling scx200 high-res timer (%s MHz +%d ppm)\n", mhz27 ? "27":"1", ppm);
- return clocksource_register(&cs_hrt);
+ return clocksource_register_hz(&cs_hrt, freq);
}
module_init(init_hrt_clocksource);
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 8a1c031..dc87eda 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -73,6 +73,8 @@ int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm)
err = -EINVAL;
mutex_unlock(&rtc->ops_lock);
+ /* A timer might have just expired */
+ schedule_work(&rtc->irqwork);
return err;
}
EXPORT_SYMBOL_GPL(rtc_set_time);
@@ -112,6 +114,8 @@ int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs)
err = -EINVAL;
mutex_unlock(&rtc->ops_lock);
+ /* A timer might have just expired */
+ schedule_work(&rtc->irqwork);
return err;
}
@@ -380,18 +384,27 @@ EXPORT_SYMBOL_GPL(rtc_set_alarm);
int rtc_initialize_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
{
int err;
+ struct rtc_time now;
err = rtc_valid_tm(&alarm->time);
if (err != 0)
return err;
+ err = rtc_read_time(rtc, &now);
+ if (err)
+ return err;
+
err = mutex_lock_interruptible(&rtc->ops_lock);
if (err)
return err;
rtc->aie_timer.node.expires = rtc_tm_to_ktime(alarm->time);
rtc->aie_timer.period = ktime_set(0, 0);
- if (alarm->enabled) {
+
+ /* Alarm has to be enabled & in the futrure for us to enqueue it */
+ if (alarm->enabled && (rtc_tm_to_ktime(now).tv64 <
+ rtc->aie_timer.node.expires.tv64)) {
+
rtc->aie_timer.enabled = 1;
timerqueue_add(&rtc->timerqueue, &rtc->aie_timer.node);
}
@@ -763,6 +776,14 @@ static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer)
return 0;
}
+static void rtc_alarm_disable(struct rtc_device *rtc)
+{
+ if (!rtc->ops || !rtc->ops->alarm_irq_enable)
+ return;
+
+ rtc->ops->alarm_irq_enable(rtc->dev.parent, false);
+}
+
/**
* rtc_timer_remove - Removes a rtc_timer from the rtc_device timerqueue
* @rtc rtc device
@@ -784,8 +805,10 @@ static void rtc_timer_remove(struct rtc_device *rtc, struct rtc_timer *timer)
struct rtc_wkalrm alarm;
int err;
next = timerqueue_getnext(&rtc->timerqueue);
- if (!next)
+ if (!next) {
+ rtc_alarm_disable(rtc);
return;
+ }
alarm.time = rtc_ktime_to_tm(next->expires);
alarm.enabled = 1;
err = __rtc_set_alarm(rtc, &alarm);
@@ -847,7 +870,8 @@ again:
err = __rtc_set_alarm(rtc, &alarm);
if (err == -ETIME)
goto again;
- }
+ } else
+ rtc_alarm_disable(rtc);
mutex_unlock(&rtc->ops_lock);
}
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 081147d..fbe89e1 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -319,13 +319,6 @@ static inline void __clocksource_updatefreq_khz(struct clocksource *cs, u32 khz)
__clocksource_updatefreq_scale(cs, 1000, khz);
}
-static inline void
-clocksource_calc_mult_shift(struct clocksource *cs, u32 freq, u32 minsec)
-{
- return clocks_calc_mult_shift(&cs->mult, &cs->shift, freq,
- NSEC_PER_SEC, minsec);
-}
-
#ifdef CONFIG_GENERIC_TIME_VSYSCALL
extern void
update_vsyscall(struct timespec *ts, struct timespec *wtm,
diff --git a/include/linux/math64.h b/include/linux/math64.h
index 23fcdfc..b8ba855 100644
--- a/include/linux/math64.h
+++ b/include/linux/math64.h
@@ -6,6 +6,8 @@
#if BITS_PER_LONG == 64
+#define div64_long(x,y) div64_s64((x),(y))
+
/**
* div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
*
@@ -45,6 +47,8 @@ static inline s64 div64_s64(s64 dividend, s64 divisor)
#elif BITS_PER_LONG == 32
+#define div64_long(x,y) div_s64((x),(y))
+
#ifndef div_u64_rem
static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
{
diff --git a/include/linux/timex.h b/include/linux/timex.h
index aa60fe7..b75e186 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -234,23 +234,9 @@ struct timex {
extern unsigned long tick_usec; /* USER_HZ period (usec) */
extern unsigned long tick_nsec; /* ACTHZ period (nsec) */
-/*
- * phase-lock loop variables
- */
-extern int time_status; /* clock synchronization status bits */
-
extern void ntp_init(void);
extern void ntp_clear(void);
-/**
- * ntp_synced - Returns 1 if the NTP status is not UNSYNC
- *
- */
-static inline int ntp_synced(void)
-{
- return !(time_status & STA_UNSYNC);
-}
-
/* Required to safely shift negative values */
#define shift_right(x, s) ({ \
__typeof__(x) __x = (x); \
@@ -264,10 +250,9 @@ static inline int ntp_synced(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 void update_ntp_one_tick(void);
extern int do_adjtimex(struct timex *);
extern void hardpps(const struct timespec *, const struct timespec *);
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 4eb3a0f..5ace266 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -297,7 +297,7 @@ void irq_enter(void)
int cpu = smp_processor_id();
rcu_irq_enter();
- if (idle_cpu(cpu) && !in_interrupt()) {
+ if (is_idle_task(current) && !in_interrupt()) {
/*
* Prevent raise_softirq from needlessly waking up ksoftirqd
* here, as softirq will be serviced on return from interrupt.
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index f6117a4..6e039b1 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -22,13 +22,16 @@
* NTP timekeeping variables:
*/
+DEFINE_SPINLOCK(ntp_lock);
+
+
/* USER_HZ period (usecs): */
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;
@@ -49,7 +52,7 @@ static struct hrtimer leap_timer;
static int time_state = TIME_OK;
/* clock status bits: */
-int time_status = STA_UNSYNC;
+static int time_status = STA_UNSYNC;
/* TAI offset (secs): */
static long time_tai;
@@ -133,7 +136,7 @@ static inline void pps_reset_freq_interval(void)
/**
* pps_clear - Clears the PPS state variables
*
- * Must be called while holding a write on the xtime_lock
+ * Must be called while holding a write on the ntp_lock
*/
static inline void pps_clear(void)
{
@@ -149,7 +152,7 @@ static inline void pps_clear(void)
* the last PPS signal. When it reaches 0, indicate that PPS signal is
* missing.
*
- * Must be called while holding a write on the xtime_lock
+ * Must be called while holding a write on the ntp_lock
*/
static inline void pps_dec_valid(void)
{
@@ -233,6 +236,17 @@ static inline void pps_fill_timex(struct timex *txc)
#endif /* CONFIG_NTP_PPS */
+
+/**
+ * ntp_synced - Returns 1 if the NTP status is not UNSYNC
+ *
+ */
+static inline int ntp_synced(void)
+{
+ return !(time_status & STA_UNSYNC);
+}
+
+
/*
* NTP methods:
*/
@@ -275,7 +289,7 @@ static inline s64 ntp_update_offset_fll(s64 offset64, long secs)
time_status |= STA_MODE;
- return div_s64(offset64 << (NTP_SCALE_SHIFT - SHIFT_FLL), secs);
+ return div64_long(offset64 << (NTP_SCALE_SHIFT - SHIFT_FLL), secs);
}
static void ntp_update_offset(long offset)
@@ -330,11 +344,13 @@ static void ntp_update_offset(long offset)
/**
* ntp_clear - Clears the NTP state variables
- *
- * Must be called while holding a write on the xtime_lock
*/
void ntp_clear(void)
{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ntp_lock, flags);
+
time_adjust = 0; /* stop active adjtime() */
time_status |= STA_UNSYNC;
time_maxerror = NTP_PHASE_LIMIT;
@@ -347,8 +363,23 @@ void ntp_clear(void)
/* Clear PPS state variables */
pps_clear();
+ spin_unlock_irqrestore(&ntp_lock, flags);
+
}
+
+u64 ntp_tick_length(void)
+{
+ unsigned long flags;
+ s64 ret;
+
+ spin_lock_irqsave(&ntp_lock, flags);
+ ret = tick_length;
+ spin_unlock_irqrestore(&ntp_lock, flags);
+ return ret;
+}
+
+
/*
* 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
@@ -357,14 +388,15 @@ void ntp_clear(void)
static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
{
enum hrtimer_restart res = HRTIMER_NORESTART;
+ unsigned long flags;
+ int leap = 0;
- write_seqlock(&xtime_lock);
-
+ spin_lock_irqsave(&ntp_lock, flags);
switch (time_state) {
case TIME_OK:
break;
case TIME_INS:
- timekeeping_leap_insert(-1);
+ leap = -1;
time_state = TIME_OOP;
printk(KERN_NOTICE
"Clock: inserting leap second 23:59:60 UTC\n");
@@ -372,7 +404,7 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
res = HRTIMER_RESTART;
break;
case TIME_DEL:
- timekeeping_leap_insert(1);
+ leap = 1;
time_tai--;
time_state = TIME_WAIT;
printk(KERN_NOTICE
@@ -387,8 +419,14 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
time_state = TIME_OK;
break;
}
+ spin_unlock_irqrestore(&ntp_lock, flags);
- write_sequnlock(&xtime_lock);
+ /*
+ * We have to call this outside of the ntp_lock to keep
+ * the proper locking hierarchy
+ */
+ if (leap)
+ timekeeping_leap_insert(leap);
return res;
}
@@ -404,6 +442,9 @@ static enum hrtimer_restart ntp_leap_second(struct hrtimer *timer)
void second_overflow(void)
{
s64 delta;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ntp_lock, flags);
/* Bump the maxerror field */
time_maxerror += MAXFREQ / NSEC_PER_USEC;
@@ -423,23 +464,25 @@ void second_overflow(void)
pps_dec_valid();
if (!time_adjust)
- return;
+ goto out;
if (time_adjust > MAX_TICKADJ) {
time_adjust -= MAX_TICKADJ;
tick_length += MAX_TICKADJ_SCALED;
- return;
+ goto out;
}
if (time_adjust < -MAX_TICKADJ) {
time_adjust += MAX_TICKADJ;
tick_length -= MAX_TICKADJ_SCALED;
- return;
+ goto out;
}
tick_length += (s64)(time_adjust * NSEC_PER_USEC / NTP_INTERVAL_FREQ)
<< NTP_SCALE_SHIFT;
time_adjust = 0;
+out:
+ spin_unlock_irqrestore(&ntp_lock, flags);
}
#ifdef CONFIG_GENERIC_CMOS_UPDATE
@@ -663,7 +706,7 @@ int do_adjtimex(struct timex *txc)
getnstimeofday(&ts);
- write_seqlock_irq(&xtime_lock);
+ spin_lock_irq(&ntp_lock);
if (txc->modes & ADJ_ADJTIME) {
long save_adjust = time_adjust;
@@ -705,7 +748,7 @@ int do_adjtimex(struct timex *txc)
/* fill PPS status fields */
pps_fill_timex(txc);
- write_sequnlock_irq(&xtime_lock);
+ spin_unlock_irq(&ntp_lock);
txc->time.tv_sec = ts.tv_sec;
txc->time.tv_usec = ts.tv_nsec;
@@ -903,7 +946,7 @@ void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
pts_norm = pps_normalize_ts(*phase_ts);
- write_seqlock_irqsave(&xtime_lock, flags);
+ spin_lock_irqsave(&ntp_lock, flags);
/* clear the error bits, they will be set again if needed */
time_status &= ~(STA_PPSJITTER | STA_PPSWANDER | STA_PPSERROR);
@@ -916,7 +959,7 @@ void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
* just start the frequency interval */
if (unlikely(pps_fbase.tv_sec == 0)) {
pps_fbase = *raw_ts;
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ spin_unlock_irqrestore(&ntp_lock, flags);
return;
}
@@ -931,7 +974,7 @@ void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
time_status |= STA_PPSJITTER;
/* restart the frequency calibration interval */
pps_fbase = *raw_ts;
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ spin_unlock_irqrestore(&ntp_lock, flags);
pr_err("hardpps: PPSJITTER: bad pulse\n");
return;
}
@@ -948,7 +991,7 @@ void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
hardpps_update_phase(pts_norm.nsec);
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ spin_unlock_irqrestore(&ntp_lock, flags);
}
EXPORT_SYMBOL(hardpps);
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index fd4a7b1..e883f57 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -575,11 +575,15 @@ void tick_broadcast_switch_to_oneshot(void)
unsigned long flags;
raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
+ if (cpumask_empty(tick_get_broadcast_mask()))
+ goto end;
tick_broadcast_device.mode = TICKDEV_MODE_ONESHOT;
bc = tick_broadcast_device.evtdev;
if (bc)
tick_broadcast_setup_oneshot(bc);
+
+end:
raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 7656642..3526038 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -182,11 +182,7 @@ static void tick_nohz_stop_idle(int cpu, ktime_t now)
static ktime_t tick_nohz_start_idle(int cpu, struct tick_sched *ts)
{
- ktime_t now;
-
- now = ktime_get();
-
- update_ts_time_stats(cpu, ts, now, NULL);
+ ktime_t now = ktime_get();
ts->idle_entrytime = now;
ts->idle_active = 1;
@@ -562,20 +558,21 @@ void tick_nohz_idle_exit(void)
local_irq_disable();
- if (ts->idle_active || (ts->inidle && ts->tick_stopped))
+ WARN_ON_ONCE(!ts->inidle);
+
+ ts->inidle = 0;
+
+ if (ts->idle_active || ts->tick_stopped)
now = ktime_get();
if (ts->idle_active)
tick_nohz_stop_idle(cpu, now);
- if (!ts->inidle || !ts->tick_stopped) {
- ts->inidle = 0;
+ if (!ts->tick_stopped) {
local_irq_enable();
return;
}
- ts->inidle = 0;
-
/* Update jiffies first */
select_nohz_load_balancer(0);
tick_do_update_jiffies64(now);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 0c63581..403c2a0 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -25,6 +25,8 @@
struct timekeeper {
/* Current clocksource used for timekeeping. */
struct clocksource *clock;
+ /* NTP adjusted clock multiplier */
+ u32 mult;
/* The shift value of the current clocksource. */
int shift;
@@ -45,12 +47,47 @@ struct timekeeper {
/* Shift conversion between clock shifted nano seconds and
* ntp shifted nano seconds. */
int ntp_error_shift;
- /* NTP adjusted clock multiplier */
- u32 mult;
+
+ /* The current time */
+ struct timespec xtime;
+ /*
+ * 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;
+ /* time spent in suspend */
+ struct timespec total_sleep_time;
+ /* 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;
+/*
+ * This read-write spinlock protects us from races in SMP while
+ * playing with xtime.
+ */
+__cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock);
+
+
+/* flag for if timekeeping is suspended */
+int __read_mostly timekeeping_suspended;
+
+
+
/**
* timekeeper_setup_internals - Set up internals to use clocksource clock.
*
@@ -135,47 +172,28 @@ static inline s64 timekeeping_get_ns_raw(void)
return clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift);
}
-/*
- * This read-write spinlock protects us from races in SMP while
- * playing with xtime.
- */
-__cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock);
-
-
-/*
- * The current time
- * 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.
- */
-static struct timespec xtime __attribute__ ((aligned (16)));
-static struct timespec wall_to_monotonic __attribute__ ((aligned (16)));
-static struct timespec total_sleep_time;
-
-/*
- * The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock.
- */
-static struct timespec raw_time;
+/* must hold write on timekeeper.lock */
+static void timekeeping_update(bool clearntp)
+{
+ if (clearntp) {
+ timekeeper.ntp_error = 0;
+ ntp_clear();
+ }
+ update_vsyscall(&timekeeper.xtime, &timekeeper.wall_to_monotonic,
+ timekeeper.clock, timekeeper.mult);
+}
-/* flag for if timekeeping is suspended */
-int __read_mostly timekeeping_suspended;
-/* must hold xtime_lock */
void timekeeping_leap_insert(int leapsecond)
{
- xtime.tv_sec += leapsecond;
- wall_to_monotonic.tv_sec -= leapsecond;
- update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
- timekeeper.mult);
+ unsigned long flags;
+
+ write_seqlock_irqsave(&timekeeper.lock, flags);
+ timekeeper.xtime.tv_sec += leapsecond;
+ timekeeper.wall_to_monotonic.tv_sec -= leapsecond;
+ timekeeping_update(false);
+ write_sequnlock_irqrestore(&timekeeper.lock, flags);
+
}
/**
@@ -202,10 +220,10 @@ static void timekeeping_forward_now(void)
/* If arch requires, add in gettimeoffset() */
nsec += arch_gettimeoffset();
- timespec_add_ns(&xtime, nsec);
+ timespec_add_ns(&timekeeper.xtime, nsec);
nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift);
- timespec_add_ns(&raw_time, nsec);
+ timespec_add_ns(&timekeeper.raw_time, nsec);
}
/**
@@ -222,15 +240,15 @@ void getnstimeofday(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqbegin(&timekeeper.lock);
- *ts = xtime;
+ *ts = timekeeper.xtime;
nsecs = timekeeping_get_ns();
/* If arch requires, add in gettimeoffset() */
nsecs += arch_gettimeoffset();
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqretry(&timekeeper.lock, seq));
timespec_add_ns(ts, nsecs);
}
@@ -245,14 +263,16 @@ ktime_t ktime_get(void)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&xtime_lock);
- secs = xtime.tv_sec + wall_to_monotonic.tv_sec;
- nsecs = xtime.tv_nsec + wall_to_monotonic.tv_nsec;
+ seq = read_seqbegin(&timekeeper.lock);
+ secs = timekeeper.xtime.tv_sec +
+ timekeeper.wall_to_monotonic.tv_sec;
+ nsecs = timekeeper.xtime.tv_nsec +
+ timekeeper.wall_to_monotonic.tv_nsec;
nsecs += timekeeping_get_ns();
/* If arch requires, add in gettimeoffset() */
nsecs += arch_gettimeoffset();
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqretry(&timekeeper.lock, seq));
/*
* Use ktime_set/ktime_add_ns to create a proper ktime on
* 32-bit architectures without CONFIG_KTIME_SCALAR.
@@ -278,14 +298,14 @@ void ktime_get_ts(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&xtime_lock);
- *ts = xtime;
- tomono = wall_to_monotonic;
+ seq = read_seqbegin(&timekeeper.lock);
+ *ts = timekeeper.xtime;
+ tomono = timekeeper.wall_to_monotonic;
nsecs = timekeeping_get_ns();
/* If arch requires, add in gettimeoffset() */
nsecs += arch_gettimeoffset();
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqretry(&timekeeper.lock, seq));
set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec,
ts->tv_nsec + tomono.tv_nsec + nsecs);
@@ -313,10 +333,10 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
do {
u32 arch_offset;
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqbegin(&timekeeper.lock);
- *ts_raw = raw_time;
- *ts_real = xtime;
+ *ts_raw = timekeeper.raw_time;
+ *ts_real = timekeeper.xtime;
nsecs_raw = timekeeping_get_ns_raw();
nsecs_real = timekeeping_get_ns();
@@ -326,7 +346,7 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
nsecs_raw += arch_offset;
nsecs_real += arch_offset;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqretry(&timekeeper.lock, seq));
timespec_add_ns(ts_raw, nsecs_raw);
timespec_add_ns(ts_real, nsecs_real);
@@ -365,23 +385,19 @@ int do_settimeofday(const struct timespec *tv)
if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
- write_seqlock_irqsave(&xtime_lock, flags);
+ write_seqlock_irqsave(&timekeeper.lock, flags);
timekeeping_forward_now();
- ts_delta.tv_sec = tv->tv_sec - xtime.tv_sec;
- ts_delta.tv_nsec = tv->tv_nsec - xtime.tv_nsec;
- wall_to_monotonic = timespec_sub(wall_to_monotonic, ts_delta);
-
- xtime = *tv;
+ ts_delta.tv_sec = tv->tv_sec - timekeeper.xtime.tv_sec;
+ ts_delta.tv_nsec = tv->tv_nsec - timekeeper.xtime.tv_nsec;
+ timekeeper.wall_to_monotonic =
+ timespec_sub(timekeeper.wall_to_monotonic, ts_delta);
- timekeeper.ntp_error = 0;
- ntp_clear();
-
- update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
- timekeeper.mult);
+ timekeeper.xtime = *tv;
+ timekeeping_update(true);
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_sequnlock_irqrestore(&timekeeper.lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@@ -405,20 +421,17 @@ int timekeeping_inject_offset(struct timespec *ts)
if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
- write_seqlock_irqsave(&xtime_lock, flags);
+ write_seqlock_irqsave(&timekeeper.lock, flags);
timekeeping_forward_now();
- xtime = timespec_add(xtime, *ts);
- wall_to_monotonic = timespec_sub(wall_to_monotonic, *ts);
-
- timekeeper.ntp_error = 0;
- ntp_clear();
+ timekeeper.xtime = timespec_add(timekeeper.xtime, *ts);
+ timekeeper.wall_to_monotonic =
+ timespec_sub(timekeeper.wall_to_monotonic, *ts);
- update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
- timekeeper.mult);
+ timekeeping_update(true);
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_sequnlock_irqrestore(&timekeeper.lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@@ -490,11 +503,11 @@ void getrawmonotonic(struct timespec *ts)
s64 nsecs;
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqbegin(&timekeeper.lock);
nsecs = timekeeping_get_ns_raw();
- *ts = raw_time;
+ *ts = timekeeper.raw_time;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqretry(&timekeeper.lock, seq));
timespec_add_ns(ts, nsecs);
}
@@ -510,24 +523,30 @@ int timekeeping_valid_for_hres(void)
int ret;
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqbegin(&timekeeper.lock);
ret = timekeeper.clock->flags & CLOCK_SOURCE_VALID_FOR_HRES;
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqretry(&timekeeper.lock, seq));
return ret;
}
/**
* timekeeping_max_deferment - Returns max time the clocksource can be deferred
- *
- * Caller must observe xtime_lock via read_seqbegin/read_seqretry to
- * ensure that the clocksource does not change!
*/
u64 timekeeping_max_deferment(void)
{
- return timekeeper.clock->max_idle_ns;
+ unsigned long seq;
+ u64 ret;
+ do {
+ seq = read_seqbegin(&timekeeper.lock);
+
+ ret = timekeeper.clock->max_idle_ns;
+
+ } while (read_seqretry(&timekeeper.lock, seq));
+
+ return ret;
}
/**
@@ -572,28 +591,29 @@ void __init timekeeping_init(void)
read_persistent_clock(&now);
read_boot_clock(&boot);
- write_seqlock_irqsave(&xtime_lock, flags);
+ seqlock_init(&timekeeper.lock);
ntp_init();
+ write_seqlock_irqsave(&timekeeper.lock, flags);
clock = clocksource_default_clock();
if (clock->enable)
clock->enable(clock);
timekeeper_setup_internals(clock);
- xtime.tv_sec = now.tv_sec;
- xtime.tv_nsec = now.tv_nsec;
- raw_time.tv_sec = 0;
- raw_time.tv_nsec = 0;
+ timekeeper.xtime.tv_sec = now.tv_sec;
+ timekeeper.xtime.tv_nsec = now.tv_nsec;
+ timekeeper.raw_time.tv_sec = 0;
+ timekeeper.raw_time.tv_nsec = 0;
if (boot.tv_sec == 0 && boot.tv_nsec == 0) {
- boot.tv_sec = xtime.tv_sec;
- boot.tv_nsec = xtime.tv_nsec;
+ boot.tv_sec = timekeeper.xtime.tv_sec;
+ boot.tv_nsec = timekeeper.xtime.tv_nsec;
}
- set_normalized_timespec(&wall_to_monotonic,
+ set_normalized_timespec(&timekeeper.wall_to_monotonic,
-boot.tv_sec, -boot.tv_nsec);
- total_sleep_time.tv_sec = 0;
- total_sleep_time.tv_nsec = 0;
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ timekeeper.total_sleep_time.tv_sec = 0;
+ timekeeper.total_sleep_time.tv_nsec = 0;
+ write_sequnlock_irqrestore(&timekeeper.lock, flags);
}
/* time in seconds when suspend began */
@@ -614,9 +634,11 @@ static void __timekeeping_inject_sleeptime(struct timespec *delta)
return;
}
- xtime = timespec_add(xtime, *delta);
- wall_to_monotonic = timespec_sub(wall_to_monotonic, *delta);
- total_sleep_time = timespec_add(total_sleep_time, *delta);
+ timekeeper.xtime = timespec_add(timekeeper.xtime, *delta);
+ timekeeper.wall_to_monotonic =
+ timespec_sub(timekeeper.wall_to_monotonic, *delta);
+ timekeeper.total_sleep_time = timespec_add(
+ timekeeper.total_sleep_time, *delta);
}
@@ -640,17 +662,15 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
if (!(ts.tv_sec == 0 && ts.tv_nsec == 0))
return;
- write_seqlock_irqsave(&xtime_lock, flags);
+ write_seqlock_irqsave(&timekeeper.lock, flags);
+
timekeeping_forward_now();
__timekeeping_inject_sleeptime(delta);
- timekeeper.ntp_error = 0;
- ntp_clear();
- update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
- timekeeper.mult);
+ timekeeping_update(true);
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_sequnlock_irqrestore(&timekeeper.lock, flags);
/* signal hrtimers about time change */
clock_was_set();
@@ -673,7 +693,7 @@ static void timekeeping_resume(void)
clocksource_resume();
- write_seqlock_irqsave(&xtime_lock, flags);
+ write_seqlock_irqsave(&timekeeper.lock, flags);
if (timespec_compare(&ts, &timekeeping_suspend_time) > 0) {
ts = timespec_sub(ts, timekeeping_suspend_time);
@@ -683,7 +703,7 @@ static void timekeeping_resume(void)
timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
timekeeper.ntp_error = 0;
timekeeping_suspended = 0;
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_sequnlock_irqrestore(&timekeeper.lock, flags);
touch_softlockup_watchdog();
@@ -701,7 +721,7 @@ static int timekeeping_suspend(void)
read_persistent_clock(&timekeeping_suspend_time);
- write_seqlock_irqsave(&xtime_lock, flags);
+ write_seqlock_irqsave(&timekeeper.lock, flags);
timekeeping_forward_now();
timekeeping_suspended = 1;
@@ -711,7 +731,7 @@ static int timekeeping_suspend(void)
* try to compensate so the difference in system time
* and persistent_clock time stays close to constant.
*/
- delta = timespec_sub(xtime, timekeeping_suspend_time);
+ delta = timespec_sub(timekeeper.xtime, timekeeping_suspend_time);
delta_delta = timespec_sub(delta, old_delta);
if (abs(delta_delta.tv_sec) >= 2) {
/*
@@ -724,7 +744,7 @@ static int timekeeping_suspend(void)
timekeeping_suspend_time =
timespec_add(timekeeping_suspend_time, delta_delta);
}
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ write_sequnlock_irqrestore(&timekeeper.lock, flags);
clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL);
clocksource_suspend();
@@ -775,7 +795,7 @@ 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;
@@ -943,22 +963,22 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
timekeeper.xtime_nsec += timekeeper.xtime_interval << shift;
while (timekeeper.xtime_nsec >= nsecps) {
timekeeper.xtime_nsec -= nsecps;
- xtime.tv_sec++;
+ timekeeper.xtime.tv_sec++;
second_overflow();
}
/* Accumulate raw time */
raw_nsecs = timekeeper.raw_interval << shift;
- raw_nsecs += raw_time.tv_nsec;
+ raw_nsecs += timekeeper.raw_time.tv_nsec;
if (raw_nsecs >= NSEC_PER_SEC) {
u64 raw_secs = raw_nsecs;
raw_nsecs = do_div(raw_secs, NSEC_PER_SEC);
- raw_time.tv_sec += raw_secs;
+ timekeeper.raw_time.tv_sec += raw_secs;
}
- raw_time.tv_nsec = raw_nsecs;
+ 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);
@@ -970,17 +990,19 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
/**
* update_wall_time - Uses the current clocksource to increment the wall time
*
- * Called from the timer interrupt, must hold a write on xtime_lock.
*/
static void update_wall_time(void)
{
struct clocksource *clock;
cycle_t offset;
int shift = 0, maxshift;
+ unsigned long flags;
+
+ write_seqlock_irqsave(&timekeeper.lock, flags);
/* Make sure we're fully resumed: */
if (unlikely(timekeeping_suspended))
- return;
+ goto out;
clock = timekeeper.clock;
@@ -989,7 +1011,8 @@ static void update_wall_time(void)
#else
offset = (clock->read(clock) - clock->cycle_last) & clock->mask;
#endif
- timekeeper.xtime_nsec = (s64)xtime.tv_nsec << timekeeper.shift;
+ timekeeper.xtime_nsec = (s64)timekeeper.xtime.tv_nsec <<
+ timekeeper.shift;
/*
* With NO_HZ we may have to accumulate many cycle_intervals
@@ -1002,7 +1025,7 @@ 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);
@@ -1040,8 +1063,10 @@ static void update_wall_time(void)
* Store full nanoseconds into xtime after rounding it up and
* add the remainder to the error difference.
*/
- xtime.tv_nsec = ((s64) timekeeper.xtime_nsec >> timekeeper.shift) + 1;
- timekeeper.xtime_nsec -= (s64) xtime.tv_nsec << timekeeper.shift;
+ timekeeper.xtime.tv_nsec = ((s64)timekeeper.xtime_nsec >>
+ timekeeper.shift) + 1;
+ timekeeper.xtime_nsec -= (s64)timekeeper.xtime.tv_nsec <<
+ timekeeper.shift;
timekeeper.ntp_error += timekeeper.xtime_nsec <<
timekeeper.ntp_error_shift;
@@ -1049,15 +1074,17 @@ static void update_wall_time(void)
* Finally, make sure that after the rounding
* xtime.tv_nsec isn't larger then NSEC_PER_SEC
*/
- if (unlikely(xtime.tv_nsec >= NSEC_PER_SEC)) {
- xtime.tv_nsec -= NSEC_PER_SEC;
- xtime.tv_sec++;
+ if (unlikely(timekeeper.xtime.tv_nsec >= NSEC_PER_SEC)) {
+ timekeeper.xtime.tv_nsec -= NSEC_PER_SEC;
+ timekeeper.xtime.tv_sec++;
second_overflow();
}
- /* check to see if there is a new clocksource to use */
- update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
- timekeeper.mult);
+ timekeeping_update(false);
+
+out:
+ write_sequnlock_irqrestore(&timekeeper.lock, flags);
+
}
/**
@@ -1074,8 +1101,10 @@ static void update_wall_time(void)
void getboottime(struct timespec *ts)
{
struct timespec boottime = {
- .tv_sec = wall_to_monotonic.tv_sec + total_sleep_time.tv_sec,
- .tv_nsec = wall_to_monotonic.tv_nsec + total_sleep_time.tv_nsec
+ .tv_sec = timekeeper.wall_to_monotonic.tv_sec +
+ timekeeper.total_sleep_time.tv_sec,
+ .tv_nsec = timekeeper.wall_to_monotonic.tv_nsec +
+ timekeeper.total_sleep_time.tv_nsec
};
set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec);
@@ -1101,13 +1130,13 @@ void get_monotonic_boottime(struct timespec *ts)
WARN_ON(timekeeping_suspended);
do {
- seq = read_seqbegin(&xtime_lock);
- *ts = xtime;
- tomono = wall_to_monotonic;
- sleep = total_sleep_time;
+ seq = read_seqbegin(&timekeeper.lock);
+ *ts = timekeeper.xtime;
+ tomono = timekeeper.wall_to_monotonic;
+ sleep = timekeeper.total_sleep_time;
nsecs = timekeeping_get_ns();
- } while (read_seqretry(&xtime_lock, seq));
+ } while (read_seqretry(&timekeeper.lock, seq));
set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec + sleep.tv_sec,
ts->tv_nsec + tomono.tv_nsec + sleep.tv_nsec + nsecs);
@@ -1137,19 +1166,19 @@ EXPORT_SYMBOL_GPL(ktime_get_boottime);
*/
void monotonic_to_bootbased(struct timespec *ts)
{
- *ts = timespec_add(*ts, total_sleep_time);
+ *ts = timespec_add(*ts, timekeeper.total_sleep_time);
}
EXPORT_SYMBOL_GPL(monotonic_to_bootbased);
unsigned long get_seconds(void)
{
- return xtime.tv_sec;
+ return timekeeper.xtime.tv_sec;
}
EXPORT_SYMBOL(get_seconds);
struct timespec __current_kernel_time(void)
{
- return xtime;
+ return timekeeper.xtime;
}
struct timespec current_kernel_time(void)
@@ -1158,10 +1187,10 @@ struct timespec current_kernel_time(void)
unsigned long seq;
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqbegin(&timekeeper.lock);
- now = xtime;
- } while (read_seqretry(&xtime_lock, seq));
+ now = timekeeper.xtime;
+ } while (read_seqretry(&timekeeper.lock, seq));
return now;
}
@@ -1173,11 +1202,11 @@ struct timespec get_monotonic_coarse(void)
unsigned long seq;
do {
- seq = read_seqbegin(&xtime_lock);
+ seq = read_seqbegin(&timekeeper.lock);
- now = xtime;
- mono = wall_to_monotonic;
- } while (read_seqretry(&xtime_lock, seq));
+ now = timekeeper.xtime;
+ mono = timekeeper.wall_to_monotonic;
+ } while (read_seqretry(&timekeeper.lock, seq));
set_normalized_timespec(&now, now.tv_sec + mono.tv_sec,
now.tv_nsec + mono.tv_nsec);
@@ -1209,11 +1238,11 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
unsigned long seq;
do {
- seq = read_seqbegin(&xtime_lock);
- *xtim = xtime;
- *wtom = wall_to_monotonic;
- *sleep = total_sleep_time;
- } while (read_seqretry(&xtime_lock, seq));
+ seq = read_seqbegin(&timekeeper.lock);
+ *xtim = timekeeper.xtime;
+ *wtom = timekeeper.wall_to_monotonic;
+ *sleep = timekeeper.total_sleep_time;
+ } while (read_seqretry(&timekeeper.lock, seq));
}
/**
@@ -1225,9 +1254,10 @@ ktime_t ktime_get_monotonic_offset(void)
struct timespec wtom;
do {
- seq = read_seqbegin(&xtime_lock);
- wtom = wall_to_monotonic;
- } while (read_seqretry(&xtime_lock, seq));
+ seq = read_seqbegin(&timekeeper.lock);
+ wtom = timekeeper.wall_to_monotonic;
+ } while (read_seqretry(&timekeeper.lock, seq));
+
return timespec_to_ktime(wtom);
}
--
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