[PATCH] hrtimer: convert posix timers completely

- convert posix-timers.c to use hrtimers

- remove the now obsolete abslist code

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/kernel/time.c

@@ -99,7 +99,8 @@ void uml_idle_timer(void)
 	set_interval(ITIMER_REAL);
 }
 
-extern int do_posix_clock_monotonic_gettime(struct timespec *tp);
+extern void ktime_get_ts(struct timespec *ts);
+#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
 
 void time_init(void)
 {
@@ -114,8 +115,8 @@ void time_init(void)
 	wall_to_monotonic.tv_nsec = -now.tv_nsec;
 }
 
-/* Declared in linux/time.h, which can't be included here */
-extern void clock_was_set(void);
+/* Defined in linux/ktimer.h, which can't be included here */
+#define clock_was_set()		do { } while (0)
 
 void do_gettimeofday(struct timeval *tv)
 {

include/linux/hrtimer.h

@@ -93,6 +93,13 @@ struct hrtimer_base {
 	struct hrtimer		*curr_timer;
 };
 
+/*
+ * clock_was_set() is a NOP for non- high-resolution systems. The
+ * time-sorted order guarantees that a timer does not expire early and
+ * is expired in the next softirq when the clock was advanced.
+ */
+#define clock_was_set()		do { } while (0)
+
 /* Exported timer functions: */
 
 /* Initialize timers: */

include/linux/posix-timers.h

@@ -51,12 +51,8 @@ struct k_itimer {
 	struct sigqueue *sigq;		/* signal queue entry. */
 	union {
 		struct {
-			struct timer_list timer;
-			/* clock abs_timer_list: */
-			struct list_head abs_timer_entry;
-			/* wall_to_monotonic used when set: */
-			struct timespec wall_to_prev;
-			unsigned long incr; /* interval in jiffies */
+			struct hrtimer timer;
+			ktime_t interval;
 		} real;
 		struct cpu_timer_list cpu;
 		struct {
@@ -68,15 +64,9 @@ struct k_itimer {
 	} it;
 };
 
-struct k_clock_abs {
-	struct list_head list;
-	spinlock_t lock;
-};
-
 struct k_clock {
 	int res;		/* in nanoseconds */
 	int (*clock_getres) (const clockid_t which_clock, struct timespec *tp);
-	struct k_clock_abs *abs_struct;
 	int (*clock_set) (const clockid_t which_clock, struct timespec * tp);
 	int (*clock_get) (const clockid_t which_clock, struct timespec * tp);
 	int (*timer_create) (struct k_itimer *timer);
@@ -102,29 +92,6 @@ int do_posix_clock_nosettime(const clockid_t, struct timespec *tp);
 /* function to call to trigger timer event */
 int posix_timer_event(struct k_itimer *timr, int si_private);
 
-struct now_struct {
-	unsigned long jiffies;
-};
-
-#define posix_get_now(now) \
-	do { (now)->jiffies = jiffies; } while (0)
-
-#define posix_time_before(timer, now) \
-                      time_before((timer)->expires, (now)->jiffies)
-
-#define posix_bump_timer(timr, now)					\
-	do {								\
-		long delta, orun;					\
-									\
-		delta = (now).jiffies - (timr)->it.real.timer.expires;	\
-		if (delta >= 0) {					\
-			orun = 1 + (delta / (timr)->it.real.incr);	\
-			(timr)->it.real.timer.expires +=		\
-				orun * (timr)->it.real.incr;		\
-			(timr)->it_overrun += orun;			\
-		}							\
-	} while (0)
-
 int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *ts);
 int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *ts);
 int posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *ts);

include/linux/time.h

@@ -73,8 +73,7 @@ struct timespec current_kernel_time(void);
 extern void do_gettimeofday(struct timeval *tv);
 extern int do_settimeofday(struct timespec *tv);
 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
-extern void clock_was_set(void); // call whenever the clock is set
-extern int do_posix_clock_monotonic_gettime(struct timespec *tp);
+#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
 extern long do_utimes(char __user *filename, struct timeval *times);
 struct itimerval;
 extern int do_setitimer(int which, struct itimerval *value,