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: (34 commits)
  time: Prevent 32 bit overflow with set_normalized_timespec()
  clocksource: Delay clocksource down rating to late boot
  clocksource: clocksource_select must be called with mutex locked
  clocksource: Resolve cpu hotplug dead lock with TSC unstable, fix crash
  timers: Drop a function prototype
  clocksource: Resolve cpu hotplug dead lock with TSC unstable
  timer.c: Fix S/390 comments
  timekeeping: Fix invalid getboottime() value
  timekeeping: Fix up read_persistent_clock() breakage on sh
  timekeeping: Increase granularity of read_persistent_clock(), build fix
  time: Introduce CLOCK_REALTIME_COARSE
  x86: Do not unregister PIT clocksource on PIT oneshot setup/shutdown
  clocksource: Avoid clocksource watchdog circular locking dependency
  clocksource: Protect the watchdog rating changes with clocksource_mutex
  clocksource: Call clocksource_change_rating() outside of watchdog_lock
  timekeeping: Introduce read_boot_clock
  timekeeping: Increase granularity of read_persistent_clock()
  timekeeping: Update clocksource with stop_machine
  timekeeping: Add timekeeper read_clock helper functions
  timekeeping: Move NTP adjusted clock multiplier to struct timekeeper
  ...

Fix trivial conflict due to MIPS lemote -> loongson renaming.

4 files changed, 19 insertions, 120 deletions

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 1219be4fb42..83d2fbd81b9 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -14,6 +14,7 @@
 #include <linux/list.h>
 #include <linux/cache.h>
 #include <linux/timer.h>
+#include <linux/init.h>
 #include <asm/div64.h>
 #include <asm/io.h>
 
@@ -148,14 +149,11 @@ extern u64 timecounter_cyc2time(struct timecounter *tc,
  * @disable:		optional function to disable the clocksource
  * @mask:		bitmask for two's complement
  *			subtraction of non 64 bit counters
- * @mult:		cycle to nanosecond multiplier (adjusted by NTP)
- * @mult_orig:		cycle to nanosecond multiplier (unadjusted by NTP)
+ * @mult:		cycle to nanosecond multiplier
  * @shift:		cycle to nanosecond divisor (power of two)
  * @flags:		flags describing special properties
  * @vread:		vsyscall based read
  * @resume:		resume function for the clocksource, if necessary
- * @cycle_interval:	Used internally by timekeeping core, please ignore.
- * @xtime_interval:	Used internally by timekeeping core, please ignore.
  */
 struct clocksource {
 	/*
@@ -169,7 +167,6 @@ struct clocksource {
 	void (*disable)(struct clocksource *cs);
 	cycle_t mask;
 	u32 mult;
-	u32 mult_orig;
 	u32 shift;
 	unsigned long flags;
 	cycle_t (*vread)(void);
@@ -181,19 +178,12 @@ struct clocksource {
 #define CLKSRC_FSYS_MMIO_SET(mmio, addr)      do { } while (0)
 #endif
 
-	/* timekeeping specific data, ignore */
-	cycle_t cycle_interval;
-	u64	xtime_interval;
-	u32	raw_interval;
 	/*
 	 * Second part is written at each timer interrupt
 	 * Keep it in a different cache line to dirty no
 	 * more than one cache line.
 	 */
 	cycle_t cycle_last ____cacheline_aligned_in_smp;
-	u64 xtime_nsec;
-	s64 error;
-	struct timespec raw_time;
 
 #ifdef CONFIG_CLOCKSOURCE_WATCHDOG
 	/* Watchdog related data, used by the framework */
@@ -202,8 +192,6 @@ struct clocksource {
 #endif
 };
 
-extern struct clocksource *clock;	/* current clocksource */
-
 /*
  * Clock source flags bits::
  */
@@ -212,6 +200,7 @@ extern struct clocksource *clock;	/* current clocksource */
 
 #define CLOCK_SOURCE_WATCHDOG			0x10
 #define CLOCK_SOURCE_VALID_FOR_HRES		0x20
+#define CLOCK_SOURCE_UNSTABLE			0x40
 
 /* simplify initialization of mask field */
 #define CLOCKSOURCE_MASK(bits) (cycle_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
@@ -268,108 +257,15 @@ static inline u32 clocksource_hz2mult(u32 hz, u32 shift_constant)
 }
 
 /**
- * clocksource_read: - Access the clocksource's current cycle value
- * @cs:		pointer to clocksource being read
- *
- * Uses the clocksource to return the current cycle_t value
- */
-static inline cycle_t clocksource_read(struct clocksource *cs)
-{
-	return cs->read(cs);
-}
-
-/**
- * clocksource_enable: - enable clocksource
- * @cs:		pointer to clocksource
- *
- * Enables the specified clocksource. The clocksource callback
- * function should start up the hardware and setup mult and field
- * members of struct clocksource to reflect hardware capabilities.
- */
-static inline int clocksource_enable(struct clocksource *cs)
-{
-	int ret = 0;
-
-	if (cs->enable)
-		ret = cs->enable(cs);
-
-	/*
-	 * The frequency may have changed while the clocksource
-	 * was disabled. If so the code in ->enable() must update
-	 * the mult value to reflect the new frequency. Make sure
-	 * mult_orig follows this change.
-	 */
-	cs->mult_orig = cs->mult;
-
-	return ret;
-}
-
-/**
- * clocksource_disable: - disable clocksource
- * @cs:		pointer to clocksource
- *
- * Disables the specified clocksource. The clocksource callback
- * function should power down the now unused hardware block to
- * save power.
- */
-static inline void clocksource_disable(struct clocksource *cs)
-{
-	/*
-	 * Save mult_orig in mult so clocksource_enable() can
-	 * restore the value regardless if ->enable() updates
-	 * the value of mult or not.
-	 */
-	cs->mult = cs->mult_orig;
-
-	if (cs->disable)
-		cs->disable(cs);
-}
-
-/**
- * cyc2ns - converts clocksource cycles to nanoseconds
- * @cs:		Pointer to clocksource
- * @cycles:	Cycles
+ * clocksource_cyc2ns - converts clocksource cycles to nanoseconds
  *
- * Uses the clocksource and ntp ajdustment to convert cycle_ts to nanoseconds.
+ * Converts cycles to nanoseconds, using the given mult and shift.
  *
  * XXX - This could use some mult_lxl_ll() asm optimization
  */
-static inline s64 cyc2ns(struct clocksource *cs, cycle_t cycles)
-{
-	u64 ret = (u64)cycles;
-	ret = (ret * cs->mult) >> cs->shift;
-	return ret;
-}
-
-/**
- * clocksource_calculate_interval - Calculates a clocksource interval struct
- *
- * @c:		Pointer to clocksource.
- * @length_nsec: Desired interval length in nanoseconds.
- *
- * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment
- * pair and interval request.
- *
- * Unless you're the timekeeping code, you should not be using this!
- */
-static inline void clocksource_calculate_interval(struct clocksource *c,
-					  	  unsigned long length_nsec)
+static inline s64 clocksource_cyc2ns(cycle_t cycles, u32 mult, u32 shift)
 {
-	u64 tmp;
-
-	/* Do the ns -> cycle conversion first, using original mult */
-	tmp = length_nsec;
-	tmp <<= c->shift;
-	tmp += c->mult_orig/2;
-	do_div(tmp, c->mult_orig);
-
-	c->cycle_interval = (cycle_t)tmp;
-	if (c->cycle_interval == 0)
-		c->cycle_interval = 1;
-
-	/* Go back from cycles -> shifted ns, this time use ntp adjused mult */
-	c->xtime_interval = (u64)c->cycle_interval * c->mult;
-	c->raw_interval = ((u64)c->cycle_interval * c->mult_orig) >> c->shift;
+	return ((u64) cycles * mult) >> shift;
 }
 
 
@@ -380,6 +276,8 @@ extern void clocksource_touch_watchdog(void);
 extern struct clocksource* clocksource_get_next(void);
 extern void clocksource_change_rating(struct clocksource *cs, int rating);
 extern void clocksource_resume(void);
+extern struct clocksource * __init __weak clocksource_default_clock(void);
+extern void clocksource_mark_unstable(struct clocksource *cs);
 
 #ifdef CONFIG_GENERIC_TIME_VSYSCALL
 extern void update_vsyscall(struct timespec *ts, struct clocksource *c);
@@ -394,4 +292,6 @@ static inline void update_vsyscall_tz(void)
 }
 #endif
 
+extern void timekeeping_notify(struct clocksource *clock);
+
 #endif /* _LINUX_CLOCKSOURCE_H */
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 4759917adc7..ff037f0b1b4 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -91,7 +91,6 @@ enum hrtimer_restart {
  * @function:	timer expiry callback function
  * @base:	pointer to the timer base (per cpu and per clock)
  * @state:	state information (See bit values above)
- * @cb_entry:	list head to enqueue an expired timer into the callback list
  * @start_site:	timer statistics field to store the site where the timer
  *		was started
  * @start_comm: timer statistics field to store the name of the process which
@@ -108,7 +107,6 @@ struct hrtimer {
 	enum hrtimer_restart		(*function)(struct hrtimer *);
 	struct hrtimer_clock_base	*base;
 	unsigned long			state;
-	struct list_head		cb_entry;
 #ifdef CONFIG_TIMER_STATS
 	int				start_pid;
 	void				*start_site;
diff --git a/include/linux/time.h b/include/linux/time.h
index ea16c1a01d5..56787c09334 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -75,7 +75,7 @@ extern unsigned long mktime(const unsigned int year, const unsigned int mon,
 			    const unsigned int day, const unsigned int hour,
 			    const unsigned int min, const unsigned int sec);
 
-extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
+extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
 extern struct timespec timespec_add_safe(const struct timespec lhs,
 					 const struct timespec rhs);
 
@@ -101,7 +101,8 @@ extern struct timespec xtime;
 extern struct timespec wall_to_monotonic;
 extern seqlock_t xtime_lock;
 
-extern unsigned long read_persistent_clock(void);
+extern void read_persistent_clock(struct timespec *ts);
+extern void read_boot_clock(struct timespec *ts);
 extern int update_persistent_clock(struct timespec now);
 extern int no_sync_cmos_clock __read_mostly;
 void timekeeping_init(void);
@@ -109,6 +110,8 @@ extern int timekeeping_suspended;
 
 unsigned long get_seconds(void);
 struct timespec current_kernel_time(void);
+struct timespec __current_kernel_time(void); /* does not hold xtime_lock */
+struct timespec get_monotonic_coarse(void);
 
 #define CURRENT_TIME		(current_kernel_time())
 #define CURRENT_TIME_SEC	((struct timespec) { get_seconds(), 0 })
@@ -147,6 +150,7 @@ extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
 extern int timekeeping_valid_for_hres(void);
 extern void update_wall_time(void);
 extern void update_xtime_cache(u64 nsec);
+extern void timekeeping_leap_insert(int leapsecond);
 
 struct tms;
 extern void do_sys_times(struct tms *);
@@ -241,6 +245,8 @@ struct itimerval {
 #define CLOCK_PROCESS_CPUTIME_ID	2
 #define CLOCK_THREAD_CPUTIME_ID		3
 #define CLOCK_MONOTONIC_RAW		4
+#define CLOCK_REALTIME_COARSE		5
+#define CLOCK_MONOTONIC_COARSE		6
 
 /*
  * The IDs of various hardware clocks:
diff --git a/include/linux/timer.h b/include/linux/timer.h
index be62ec2ebea..a2d1eb6cb3f 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -175,11 +175,6 @@ extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires);
 
 /*
  * Return when the next timer-wheel timeout occurs (in absolute jiffies),
- * locks the timer base:
- */
-extern unsigned long next_timer_interrupt(void);
-/*
- * Return when the next timer-wheel timeout occurs (in absolute jiffies),
  * locks the timer base and does the comparison against the given
  * jiffie.
  */