Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/…

…linux/kernel/git/tip/tip

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits)
  time, s390: Get rid of compile warning
  dw_apb_timer: constify clocksource name
  time: Cleanup old CONFIG_GENERIC_TIME references that snuck in
  time: Change jiffies_to_clock_t() argument type to unsigned long
  alarmtimers: Fix error handling
  clocksource: Make watchdog reset lockless
  posix-cpu-timers: Cure SMP accounting oddities
  s390: Use direct ktime path for s390 clockevent device
  clockevents: Add direct ktime programming function
  clockevents: Make minimum delay adjustments configurable
  nohz: Remove "Switched to NOHz mode" debugging messages
  proc: Consider NO_HZ when printing idle and iowait times
  nohz: Make idle/iowait counter update conditional
  nohz: Fix update_ts_time_stat idle accounting
  cputime: Clean up cputime_to_usecs and usecs_to_cputime macros
  alarmtimers: Rework RTC device selection using class interface
  alarmtimers: Add try_to_cancel functionality
  alarmtimers: Add more refined alarm state tracking
  alarmtimers: Remove period from alarm structure
  alarmtimers: Remove interval cap limit hack
  ...

arch/arm/Kconfig

@@ -346,7 +346,6 @@ config ARCH_GEMINI
 config ARCH_PRIMA2
 	bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
 	select CPU_V7
-	select GENERIC_TIME
 	select NO_IOPORT
 	select GENERIC_CLOCKEVENTS
 	select CLKDEV_LOOKUP
@@ -520,7 +519,6 @@ config ARCH_LPC32XX
 	select ARM_AMBA
 	select USB_ARCH_HAS_OHCI
 	select CLKDEV_LOOKUP
-	select GENERIC_TIME
 	select GENERIC_CLOCKEVENTS
 	help
 	  Support for the NXP LPC32XX family of processors
@@ -599,7 +597,6 @@ config ARCH_TEGRA
 	bool "NVIDIA Tegra"
 	select CLKDEV_LOOKUP
 	select CLKSRC_MMIO
-	select GENERIC_TIME
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_GPIO
 	select HAVE_CLK
@@ -914,7 +911,6 @@ config ARCH_VT8500
 config ARCH_ZYNQ
 	bool "Xilinx Zynq ARM Cortex A9 Platform"
 	select CPU_V7
-	select GENERIC_TIME
 	select GENERIC_CLOCKEVENTS
 	select CLKDEV_LOOKUP
 	select ARM_GIC

arch/mn10300/Kconfig

@@ -47,9 +47,6 @@ config GENERIC_CMOS_UPDATE
 config GENERIC_HWEIGHT
 	def_bool y
 
-config GENERIC_TIME
-	def_bool y
-
 config GENERIC_CLOCKEVENTS
 	def_bool y
 

arch/s390/kernel/time.c

@@ -109,10 +109,14 @@ static void fixup_clock_comparator(unsigned long long delta)
 	set_clock_comparator(S390_lowcore.clock_comparator);
 }
 
-static int s390_next_event(unsigned long delta,
+static int s390_next_ktime(ktime_t expires,
 			   struct clock_event_device *evt)
 {
-	S390_lowcore.clock_comparator = get_clock() + delta;
+	u64 nsecs;
+
+	nsecs = ktime_to_ns(ktime_sub(expires, ktime_get_monotonic_offset()));
+	do_div(nsecs, 125);
+	S390_lowcore.clock_comparator = TOD_UNIX_EPOCH + (nsecs << 9);
 	set_clock_comparator(S390_lowcore.clock_comparator);
 	return 0;
 }
@@ -137,14 +141,15 @@ void init_cpu_timer(void)
 	cpu = smp_processor_id();
 	cd = &per_cpu(comparators, cpu);
 	cd->name		= "comparator";
-	cd->features		= CLOCK_EVT_FEAT_ONESHOT;
+	cd->features		= CLOCK_EVT_FEAT_ONESHOT |
+				  CLOCK_EVT_FEAT_KTIME;
 	cd->mult		= 16777;
 	cd->shift		= 12;
 	cd->min_delta_ns	= 1;
 	cd->max_delta_ns	= LONG_MAX;
 	cd->rating		= 400;
 	cd->cpumask		= cpumask_of(cpu);
-	cd->set_next_event	= s390_next_event;
+	cd->set_next_ktime	= s390_next_ktime;
 	cd->set_mode		= s390_set_mode;
 
 	clockevents_register_device(cd);

arch/tile/Kconfig

@@ -46,9 +46,6 @@ config NEED_PER_CPU_PAGE_FIRST_CHUNK
 config SYS_SUPPORTS_HUGETLBFS
 	def_bool y
 
-config GENERIC_TIME
-	def_bool y
-
 config GENERIC_CLOCKEVENTS
 	def_bool y
 

arch/tile/configs/tilegx_defconfig

@@ -11,7 +11,6 @@ CONFIG_HAVE_ARCH_ALLOC_REMAP=y
 CONFIG_HAVE_SETUP_PER_CPU_AREA=y
 CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
 CONFIG_SYS_SUPPORTS_HUGETLBFS=y
-CONFIG_GENERIC_TIME=y
 CONFIG_GENERIC_CLOCKEVENTS=y
 CONFIG_RWSEM_GENERIC_SPINLOCK=y
 CONFIG_DEFAULT_MIGRATION_COST=10000000

arch/tile/configs/tilepro_defconfig

@@ -11,7 +11,6 @@ CONFIG_HAVE_ARCH_ALLOC_REMAP=y
 CONFIG_HAVE_SETUP_PER_CPU_AREA=y
 CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
 CONFIG_SYS_SUPPORTS_HUGETLBFS=y
-CONFIG_GENERIC_TIME=y
 CONFIG_GENERIC_CLOCKEVENTS=y
 CONFIG_RWSEM_GENERIC_SPINLOCK=y
 CONFIG_DEFAULT_MIGRATION_COST=10000000

arch/um/defconfig

@@ -13,7 +13,6 @@ CONFIG_LOCKDEP_SUPPORT=y
 # CONFIG_STACKTRACE_SUPPORT is not set
 CONFIG_GENERIC_CALIBRATE_DELAY=y
 CONFIG_GENERIC_BUG=y
-CONFIG_GENERIC_TIME=y
 CONFIG_GENERIC_CLOCKEVENTS=y
 CONFIG_IRQ_RELEASE_METHOD=y
 CONFIG_HZ=100

arch/x86/Kconfig

@@ -68,6 +68,7 @@ config X86
 	select GENERIC_IRQ_PROBE
 	select GENERIC_PENDING_IRQ if SMP
 	select GENERIC_IRQ_SHOW
+	select GENERIC_CLOCKEVENTS_MIN_ADJUST
 	select IRQ_FORCED_THREADING
 	select USE_GENERIC_SMP_HELPERS if SMP
 	select HAVE_BPF_JIT if (X86_64 && NET)

arch/xtensa/configs/iss_defconfig

@@ -15,7 +15,6 @@ CONFIG_GENERIC_GPIO=y
 # CONFIG_ARCH_HAS_ILOG2_U64 is not set
 CONFIG_NO_IOPORT=y
 CONFIG_HZ=100
-CONFIG_GENERIC_TIME=y
 CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
 CONFIG_CONSTRUCTORS=y
 

arch/xtensa/configs/s6105_defconfig

@@ -15,7 +15,6 @@ CONFIG_GENERIC_GPIO=y
 # CONFIG_ARCH_HAS_ILOG2_U64 is not set
 CONFIG_NO_IOPORT=y
 CONFIG_HZ=100
-CONFIG_GENERIC_TIME=y
 CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
 
 #

drivers/clocksource/dw_apb_timer.c

@@ -348,7 +348,7 @@ static void apbt_restart_clocksource(struct clocksource *cs)
  * dw_apb_clocksource_register() as the next step.
  */
 struct dw_apb_clocksource *
-dw_apb_clocksource_init(unsigned rating, char *name, void __iomem *base,
+dw_apb_clocksource_init(unsigned rating, const char *name, void __iomem *base,
 			unsigned long freq)
 {
 	struct dw_apb_clocksource *dw_cs = kzalloc(sizeof(*dw_cs), GFP_KERNEL);

drivers/cpufreq/cpufreq_conservative.c

@@ -120,10 +120,12 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
 
 static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
 {
-	u64 idle_time = get_cpu_idle_time_us(cpu, wall);
+	u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
 
 	if (idle_time == -1ULL)
 		return get_cpu_idle_time_jiffy(cpu, wall);
+	else
+		idle_time += get_cpu_iowait_time_us(cpu, wall);
 
 	return idle_time;
 }

drivers/cpufreq/cpufreq_ondemand.c

@@ -144,10 +144,12 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
 
 static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
 {
-	u64 idle_time = get_cpu_idle_time_us(cpu, wall);
+	u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
 
 	if (idle_time == -1ULL)
 		return get_cpu_idle_time_jiffy(cpu, wall);
+	else
+		idle_time += get_cpu_iowait_time_us(cpu, wall);
 
 	return idle_time;
 }

fs/proc/stat.c

@@ -10,6 +10,7 @@
 #include <linux/time.h>
 #include <linux/irqnr.h>
 #include <asm/cputime.h>
+#include <linux/tick.h>
 
 #ifndef arch_irq_stat_cpu
 #define arch_irq_stat_cpu(cpu) 0
@@ -21,6 +22,35 @@
 #define arch_idle_time(cpu) 0
 #endif
 
+static cputime64_t get_idle_time(int cpu)
+{
+	u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
+	cputime64_t idle;
+
+	if (idle_time == -1ULL) {
+		/* !NO_HZ so we can rely on cpustat.idle */
+		idle = kstat_cpu(cpu).cpustat.idle;
+		idle = cputime64_add(idle, arch_idle_time(cpu));
+	} else
+		idle = usecs_to_cputime(idle_time);
+
+	return idle;
+}
+
+static cputime64_t get_iowait_time(int cpu)
+{
+	u64 iowait_time = get_cpu_iowait_time_us(cpu, NULL);
+	cputime64_t iowait;
+
+	if (iowait_time == -1ULL)
+		/* !NO_HZ so we can rely on cpustat.iowait */
+		iowait = kstat_cpu(cpu).cpustat.iowait;
+	else
+		iowait = usecs_to_cputime(iowait_time);
+
+	return iowait;
+}
+
 static int show_stat(struct seq_file *p, void *v)
 {
 	int i, j;
@@ -42,9 +72,8 @@ static int show_stat(struct seq_file *p, void *v)
 		user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 		nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 		system = cputime64_add(system, kstat_cpu(i).cpustat.system);
-		idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
-		idle = cputime64_add(idle, arch_idle_time(i));
-		iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
+		idle = cputime64_add(idle, get_idle_time(i));
+		iowait = cputime64_add(iowait, get_iowait_time(i));
 		irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 		softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 		steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
@@ -76,14 +105,12 @@ static int show_stat(struct seq_file *p, void *v)
 		(unsigned long long)cputime64_to_clock_t(guest),
 		(unsigned long long)cputime64_to_clock_t(guest_nice));
 	for_each_online_cpu(i) {
-
 		/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 		user = kstat_cpu(i).cpustat.user;
 		nice = kstat_cpu(i).cpustat.nice;
 		system = kstat_cpu(i).cpustat.system;
-		idle = kstat_cpu(i).cpustat.idle;
-		idle = cputime64_add(idle, arch_idle_time(i));
-		iowait = kstat_cpu(i).cpustat.iowait;
+		idle = get_idle_time(i);
+		iowait = get_iowait_time(i);
 		irq = kstat_cpu(i).cpustat.irq;
 		softirq = kstat_cpu(i).cpustat.softirq;
 		steal = kstat_cpu(i).cpustat.steal;

include/asm-generic/cputime.h

@@ -38,8 +38,8 @@ typedef u64 cputime64_t;
 /*
  * Convert cputime to microseconds and back.
  */
-#define cputime_to_usecs(__ct)		jiffies_to_usecs(__ct);
-#define usecs_to_cputime(__msecs)	usecs_to_jiffies(__msecs);
+#define cputime_to_usecs(__ct)		jiffies_to_usecs(__ct)
+#define usecs_to_cputime(__msecs)	usecs_to_jiffies(__msecs)
 
 /*
  * Convert cputime to seconds and back.

include/linux/alarmtimer.h

@@ -13,6 +13,16 @@ enum alarmtimer_type {
 	ALARM_NUMTYPE,
 };
 
+enum alarmtimer_restart {
+	ALARMTIMER_NORESTART,
+	ALARMTIMER_RESTART,
+};
+
+
+#define ALARMTIMER_STATE_INACTIVE	0x00
+#define ALARMTIMER_STATE_ENQUEUED	0x01
+#define ALARMTIMER_STATE_CALLBACK	0x02
+
 /**
  * struct alarm - Alarm timer structure
  * @node:	timerqueue node for adding to the event list this value
@@ -25,16 +35,45 @@ enum alarmtimer_type {
  */
 struct alarm {
 	struct timerqueue_node	node;
-	ktime_t			period;
-	void			(*function)(struct alarm *);
+	enum alarmtimer_restart	(*function)(struct alarm *, ktime_t now);
 	enum alarmtimer_type	type;
-	bool			enabled;
+	int			state;
 	void			*data;
 };
 
 void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
-		void (*function)(struct alarm *));
-void alarm_start(struct alarm *alarm, ktime_t start, ktime_t period);
-void alarm_cancel(struct alarm *alarm);
+		enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
+void alarm_start(struct alarm *alarm, ktime_t start);
+int alarm_try_to_cancel(struct alarm *alarm);
+int alarm_cancel(struct alarm *alarm);
+
+u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
+
+/*
+ * A alarmtimer is active, when it is enqueued into timerqueue or the
+ * callback function is running.
+ */
+static inline int alarmtimer_active(const struct alarm *timer)
+{
+	return timer->state != ALARMTIMER_STATE_INACTIVE;
+}
+
+/*
+ * Helper function to check, whether the timer is on one of the queues
+ */
+static inline int alarmtimer_is_queued(struct alarm *timer)
+{
+	return timer->state & ALARMTIMER_STATE_ENQUEUED;
+}
+
+/*
+ * Helper function to check, whether the timer is running the callback
+ * function
+ */
+static inline int alarmtimer_callback_running(struct alarm *timer)
+{
+	return timer->state & ALARMTIMER_STATE_CALLBACK;
+}
+
 
 #endif

include/linux/clockchips.h

@@ -45,20 +45,22 @@ enum clock_event_nofitiers {
  */
 #define CLOCK_EVT_FEAT_PERIODIC		0x000001
 #define CLOCK_EVT_FEAT_ONESHOT		0x000002
+#define CLOCK_EVT_FEAT_KTIME		0x000004
 /*
  * x86(64) specific misfeatures:
  *
  * - Clockevent source stops in C3 State and needs broadcast support.
  * - Local APIC timer is used as a dummy device.
  */
-#define CLOCK_EVT_FEAT_C3STOP		0x000004
-#define CLOCK_EVT_FEAT_DUMMY		0x000008
+#define CLOCK_EVT_FEAT_C3STOP		0x000008
+#define CLOCK_EVT_FEAT_DUMMY		0x000010
 
 /**
  * struct clock_event_device - clock event device descriptor
  * @event_handler:	Assigned by the framework to be called by the low
  *			level handler of the event source
- * @set_next_event:	set next event function
+ * @set_next_event:	set next event function using a clocksource delta
+ * @set_next_ktime:	set next event function using a direct ktime value
  * @next_event:		local storage for the next event in oneshot mode
  * @max_delta_ns:	maximum delta value in ns
  * @min_delta_ns:	minimum delta value in ns
@@ -81,6 +83,8 @@ struct clock_event_device {
 	void			(*event_handler)(struct clock_event_device *);
 	int			(*set_next_event)(unsigned long evt,
 						  struct clock_event_device *);
+	int			(*set_next_ktime)(ktime_t expires,
+						  struct clock_event_device *);
 	ktime_t			next_event;
 	u64			max_delta_ns;
 	u64			min_delta_ns;
@@ -140,7 +144,7 @@ extern void clockevents_set_mode(struct clock_event_device *dev,
 				 enum clock_event_mode mode);
 extern int clockevents_register_notifier(struct notifier_block *nb);
 extern int clockevents_program_event(struct clock_event_device *dev,
-				     ktime_t expires, ktime_t now);
+				     ktime_t expires, bool force);
 
 extern void clockevents_handle_noop(struct clock_event_device *dev);
 

include/linux/dw_apb_timer.h

@@ -46,7 +46,7 @@ struct dw_apb_clock_event_device *
 dw_apb_clockevent_init(int cpu, const char *name, unsigned rating,
 		       void __iomem *base, int irq, unsigned long freq);
 struct dw_apb_clocksource *
-dw_apb_clocksource_init(unsigned rating, char *name, void __iomem *base,
+dw_apb_clocksource_init(unsigned rating, const char *name, void __iomem *base,
 			unsigned long freq);
 void dw_apb_clocksource_register(struct dw_apb_clocksource *dw_cs);
 void dw_apb_clocksource_start(struct dw_apb_clocksource *dw_cs);

include/linux/jiffies.h

@@ -303,7 +303,7 @@ extern void jiffies_to_timespec(const unsigned long jiffies,
 extern unsigned long timeval_to_jiffies(const struct timeval *value);
 extern void jiffies_to_timeval(const unsigned long jiffies,
 			       struct timeval *value);
-extern clock_t jiffies_to_clock_t(long x);
+extern clock_t jiffies_to_clock_t(unsigned long x);
 extern unsigned long clock_t_to_jiffies(unsigned long x);
 extern u64 jiffies_64_to_clock_t(u64 x);
 extern u64 nsec_to_clock_t(u64 x);

include/linux/posix-timers.h

@@ -81,7 +81,10 @@ struct k_itimer {
 			unsigned long incr;
 			unsigned long expires;
 		} mmtimer;
-		struct alarm alarmtimer;
+		struct {
+			struct alarm alarmtimer;
+			ktime_t interval;
+		} alarm;
 		struct rcu_head rcu;
 	} it;
 };