From: Joe Jin <joe.jin@oracle.com>
Date: Tue, 28 Aug 2012 10:13:05 +0000 (+0800)
Subject: Revert "3.0.x: hrtimer: Update hrtimer base offsets each hrtimer_interrupt"
X-Git-Tag: v2.6.39-400.9.0~328
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=697d22d9724037fd9beff31188d97b867b90511e;p=users%2Fjedix%2Flinux-maple.git

Revert "3.0.x: hrtimer: Update hrtimer base offsets each hrtimer_interrupt"

This reverts commit 54b16ee687c86dfd6c94e49bdaa1535a3bf3cc9f.
---

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index f6b2a74bfc9f..fd0dc30c9f15 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -320,9 +320,6 @@ extern ktime_t ktime_get(void);
 extern ktime_t ktime_get_real(void);
 extern ktime_t ktime_get_boottime(void);
 extern ktime_t ktime_get_monotonic_offset(void);
-extern void ktime_get_and_real_and_sleep_offset(ktime_t *monotonic,
-						ktime_t *real_offset,
-						ktime_t *sleep_offset);
 
 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
 
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 70e9951627c5..250b2b5205a3 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1258,26 +1258,18 @@ static void __run_hrtimer(struct hrtimer *timer, ktime_t *now)
 void hrtimer_interrupt(struct clock_event_device *dev)
 {
 	struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
-	ktime_t expires_next, now, entry_time, delta, real_offset, sleep_offset;
+	ktime_t expires_next, now, entry_time, delta;
 	int i, retries = 0;
 
 	BUG_ON(!cpu_base->hres_active);
 	cpu_base->nr_events++;
 	dev->next_event.tv64 = KTIME_MAX;
 
-
-	ktime_get_and_real_and_sleep_offset(&now, &real_offset, &sleep_offset);
-
-	entry_time = now;
+	entry_time = now = ktime_get();
 retry:
 	expires_next.tv64 = KTIME_MAX;
 
 	raw_spin_lock(&cpu_base->lock);
-
-	/* Update base offsets, to avoid early wakeups */
-	cpu_base->clock_base[HRTIMER_BASE_REALTIME].offset = real_offset;
-	cpu_base->clock_base[HRTIMER_BASE_BOOTTIME].offset = sleep_offset;
-
 	/*
 	 * We set expires_next to KTIME_MAX here with cpu_base->lock
 	 * held to prevent that a timer is enqueued in our queue via
@@ -1354,7 +1346,7 @@ retry:
 	 * interrupt routine. We give it 3 attempts to avoid
 	 * overreacting on some spurious event.
 	 */
-	ktime_get_and_real_and_sleep_offset(&now, &real_offset, &sleep_offset);
+	now = ktime_get();
 	cpu_base->nr_retries++;
 	if (++retries < 3)
 		goto retry;
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 0f140a76f9e6..a3d79d26f0e7 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1107,40 +1107,6 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
 	} while (read_seqretry(&xtime_lock, seq));
 }
 
-/**
- * ktime_get_and_real_and_sleep_offset() - hrtimer helper, gets monotonic ktime,
- *	realtime offset, and sleep offsets.
- */
-void ktime_get_and_real_and_sleep_offset(ktime_t *monotonic,
-						ktime_t *real_offset,
-						ktime_t *sleep_offset)
-{
-	unsigned long seq;
-	struct timespec wtom, sleep;
-	u64 secs, nsecs;
-
-	do {
-		seq = read_seqbegin(&xtime_lock);
-
-		secs = xtime.tv_sec +
-				wall_to_monotonic.tv_sec;
-		nsecs = xtime.tv_nsec +
-				wall_to_monotonic.tv_nsec;
-		nsecs += timekeeping_get_ns();
-		/* If arch requires, add in gettimeoffset() */
-		nsecs += arch_gettimeoffset();
-
-		wtom = wall_to_monotonic;
-		sleep = total_sleep_time;
-	} while (read_seqretry(&xtime_lock, seq));
-
-	*monotonic = ktime_add_ns(ktime_set(secs, 0), nsecs);
-	set_normalized_timespec(&wtom, -wtom.tv_sec, -wtom.tv_nsec);
-	*real_offset =	timespec_to_ktime(wtom);
-	*sleep_offset = timespec_to_ktime(sleep);
-}
-
-
 /**
  * ktime_get_monotonic_offset() - get wall_to_monotonic in ktime_t format
  */