There are some typos in timer module, as below:

  presicion ==> precision
  gobal ==> global
  exectued ==> executed
  refere ==> refer
  avarage ==> average

Just fix it.

Signed-off-by: Jianyun Gao <jianyungao89@gmail.com>
---
 include/linux/delay.h         | 8 ++++----
 kernel/time/posix-timers.c    | 2 +-
 kernel/time/timer_migration.c | 4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/linux/delay.h b/include/linux/delay.h
index 89866bab100d..46412c00033a 100644
--- a/include/linux/delay.h
+++ b/include/linux/delay.h
@@ -68,7 +68,7 @@ void usleep_range_state(unsigned long min, unsigned long max,
  * @min:	Minimum time in microseconds to sleep
  * @max:	Maximum time in microseconds to sleep
  *
- * For basic information please refere to usleep_range_state().
+ * For basic information please refer to usleep_range_state().
  *
  * The task will be in the state TASK_UNINTERRUPTIBLE during the sleep.
  */
@@ -82,10 +82,10 @@ static inline void usleep_range(unsigned long min, unsigned long max)
  * @min:	Minimum time in microseconds to sleep
  * @max:	Maximum time in microseconds to sleep
  *
- * For basic information please refere to usleep_range_state().
+ * For basic information please refer to usleep_range_state().
  *
  * The sleeping task has the state TASK_IDLE during the sleep to prevent
- * contribution to the load avarage.
+ * contribution to the load average.
  */
 static inline void usleep_range_idle(unsigned long min, unsigned long max)
 {
@@ -96,7 +96,7 @@ static inline void usleep_range_idle(unsigned long min, unsigned long max)
  * ssleep - wrapper for seconds around msleep
  * @seconds:	Requested sleep duration in seconds
  *
- * Please refere to msleep() for detailed information.
+ * Please refer to msleep() for detailed information.
  */
 static inline void ssleep(unsigned int seconds)
 {
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index aa3120104a51..36dbb8146517 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1242,7 +1242,7 @@ SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
  *    sys_clock_settime(). The kernel internal timekeeping is always using
  *    nanoseconds precision independent of the clocksource device which is
  *    used to read the time from. The resolution of that device only
- *    affects the presicion of the time returned by sys_clock_gettime().
+ *    affects the precision of the time returned by sys_clock_gettime().
  *
  * Returns:
  *	0		Success. @tp contains the resolution
diff --git a/kernel/time/timer_migration.c b/kernel/time/timer_migration.c
index c0c54dc5314c..d4f4398dec50 100644
--- a/kernel/time/timer_migration.c
+++ b/kernel/time/timer_migration.c
@@ -708,7 +708,7 @@ void tmigr_cpu_activate(void)
 /*
  * Returns true, if there is nothing to be propagated to the next level
  *
- * @data->firstexp is set to expiry of first gobal event of the (top level of
+ * @data->firstexp is set to expiry of first global event of the (top level of
  * the) hierarchy, but only when hierarchy is completely idle.
  *
  * The child and group states need to be read under the lock, to prevent a race
@@ -1621,7 +1621,7 @@ static void tmigr_connect_child_parent(struct tmigr_group *child,
 	 *   created group (parent).
 	 *
 	 * * It is ensured that the child is active, as this setup path is
-	 *   executed in hotplug prepare callback. This is exectued by an
+	 *   executed in hotplug prepare callback. This is executed by an
 	 *   already connected and !idle CPU. Even if all other CPUs go idle,
 	 *   the CPU executing the setup will be responsible up to current top
 	 *   level group. And the next time it goes inactive, it will release
-- 
2.34.1