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authorLinus Torvalds <torvalds@linux-foundation.org>2009-12-08 19:27:08 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-08 19:27:08 -0800
commit60d8ce2cd6c283132928c11f3fd57ff4187287e0 (patch)
tree36d08a2ead7a7d8c3c081d484215ccca00bf6aab /include/linux
parent849e8dea099aafa56db9e74b580b0d858b956533 (diff)
parentfeae3203d711db0a9965300ee6d592257fdaae4f (diff)
Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: timers, init: Limit the number of per cpu calibration bootup messages posix-cpu-timers: optimize and document timer_create callback clockevents: Add missing include to pacify sparse x86: vmiclock: Fix printk format x86: Fix printk format due to variable type change sparc: fix printk for change of variable type clocksource/events: Fix fallout of generic code changes nohz: Allow 32-bit machines to sleep for more than 2.15 seconds nohz: Track last do_timer() cpu nohz: Prevent clocksource wrapping during idle nohz: Type cast printk argument mips: Use generic mult/shift factor calculation for clocks clocksource: Provide a generic mult/shift factor calculation clockevents: Use u32 for mult and shift factors nohz: Introduce arch_needs_cpu nohz: Reuse ktime in sub-functions of tick_check_idle. time: Remove xtime_cache time: Implement logarithmic time accumulation
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/clockchips.h19
-rw-r--r--include/linux/clocksource.h12
-rw-r--r--include/linux/tick.h5
-rw-r--r--include/linux/time.h1
-rw-r--r--include/linux/timex.h4
5 files changed, 31 insertions, 10 deletions
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h
index 3a1dbba4d3a..0cf725bdd2a 100644
--- a/include/linux/clockchips.h
+++ b/include/linux/clockchips.h
@@ -77,10 +77,10 @@ enum clock_event_nofitiers {
struct clock_event_device {
const char *name;
unsigned int features;
- unsigned long max_delta_ns;
- unsigned long min_delta_ns;
- unsigned long mult;
- int shift;
+ u64 max_delta_ns;
+ u64 min_delta_ns;
+ u32 mult;
+ u32 shift;
int rating;
int irq;
const struct cpumask *cpumask;
@@ -116,8 +116,8 @@ static inline unsigned long div_sc(unsigned long ticks, unsigned long nsec,
}
/* Clock event layer functions */
-extern unsigned long clockevent_delta2ns(unsigned long latch,
- struct clock_event_device *evt);
+extern u64 clockevent_delta2ns(unsigned long latch,
+ struct clock_event_device *evt);
extern void clockevents_register_device(struct clock_event_device *dev);
extern void clockevents_exchange_device(struct clock_event_device *old,
@@ -130,6 +130,13 @@ extern int clockevents_program_event(struct clock_event_device *dev,
extern void clockevents_handle_noop(struct clock_event_device *dev);
+static inline void
+clockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 minsec)
+{
+ return clocks_calc_mult_shift(&ce->mult, &ce->shift, NSEC_PER_SEC,
+ freq, minsec);
+}
+
#ifdef CONFIG_GENERIC_CLOCKEVENTS
extern void clockevents_notify(unsigned long reason, void *arg);
#else
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 83d2fbd81b9..279c5478e8a 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -151,6 +151,7 @@ extern u64 timecounter_cyc2time(struct timecounter *tc,
* subtraction of non 64 bit counters
* @mult: cycle to nanosecond multiplier
* @shift: cycle to nanosecond divisor (power of two)
+ * @max_idle_ns: max idle time permitted by the clocksource (nsecs)
* @flags: flags describing special properties
* @vread: vsyscall based read
* @resume: resume function for the clocksource, if necessary
@@ -168,6 +169,7 @@ struct clocksource {
cycle_t mask;
u32 mult;
u32 shift;
+ u64 max_idle_ns;
unsigned long flags;
cycle_t (*vread)(void);
void (*resume)(void);
@@ -279,6 +281,16 @@ extern void clocksource_resume(void);
extern struct clocksource * __init __weak clocksource_default_clock(void);
extern void clocksource_mark_unstable(struct clocksource *cs);
+extern void
+clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec);
+
+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 clocksource *c);
extern void update_vsyscall_tz(void);
diff --git a/include/linux/tick.h b/include/linux/tick.h
index 0482229c07d..d2ae79e21be 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -43,6 +43,7 @@ enum tick_nohz_mode {
* @idle_exittime: Time when the idle state was left
* @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
* @sleep_length: Duration of the current idle sleep
+ * @do_timer_lst: CPU was the last one doing do_timer before going idle
*/
struct tick_sched {
struct hrtimer sched_timer;
@@ -64,6 +65,7 @@ struct tick_sched {
unsigned long last_jiffies;
unsigned long next_jiffies;
ktime_t idle_expires;
+ int do_timer_last;
};
extern void __init tick_init(void);
@@ -98,6 +100,9 @@ extern int tick_check_oneshot_change(int allow_nohz);
extern struct tick_sched *tick_get_tick_sched(int cpu);
extern void tick_check_idle(int cpu);
extern int tick_oneshot_mode_active(void);
+# ifndef arch_needs_cpu
+# define arch_needs_cpu(cpu) (0)
+# endif
# else
static inline void tick_clock_notify(void) { }
static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
diff --git a/include/linux/time.h b/include/linux/time.h
index fe04e5ef6a5..6e026e45a17 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -148,6 +148,7 @@ extern void monotonic_to_bootbased(struct timespec *ts);
extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
extern int timekeeping_valid_for_hres(void);
+extern u64 timekeeping_max_deferment(void);
extern void update_wall_time(void);
extern void update_xtime_cache(u64 nsec);
extern void timekeeping_leap_insert(int leapsecond);
diff --git a/include/linux/timex.h b/include/linux/timex.h
index e6967d10d9e..0c0ef7d4db7 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -261,11 +261,7 @@ static inline int ntp_synced(void)
#define NTP_SCALE_SHIFT 32
-#ifdef CONFIG_NO_HZ
-#define NTP_INTERVAL_FREQ (2)
-#else
#define NTP_INTERVAL_FREQ (HZ)
-#endif
#define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_INTERVAL_FREQ)
/* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */