hrtimer: add init function to properly set hrtimer_start_on_info params

This helper function is also useful to remind us that if we use
hrtimer_pull outside the scope of triggering remote releases, we need to
take care of properly set the "state" field of hrtimer_start_on_info
structure.

2 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 370096d132d1..9470a9e4a8ff 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -374,6 +374,7 @@ __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
                          const enum hrtimer_mode mode, int wakeup);
 
 #ifdef CONFIG_ARCH_HAS_SEND_PULL_TIMERS
+extern void hrtimer_start_on_info_init(struct hrtimer_start_on_info *info);
 extern int hrtimer_start_on(int cpu, struct hrtimer_start_on_info *info,
                         struct hrtimer *timer, ktime_t time,
                         const enum hrtimer_mode mode);
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 18314ae830ee..fdf95968e517 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1046,6 +1046,15 @@ EXPORT_SYMBOL_GPL(hrtimer_start);
 #ifdef CONFIG_ARCH_HAS_SEND_PULL_TIMERS
 
 /**
+ * hrtimer_start_on_info_init - Initialize hrtimer_start_on_info
+ */
+void hrtimer_start_on_info_init(struct hrtimer_start_on_info *info)
+{
+        memset(info, 0, sizeof(struct hrtimer_start_on_info));
+        atomic_set(&info->state, HRTIMER_START_ON_INACTIVE);
+}
+
+/**
  *  hrtimer_pull - PULL_TIMERS_VECTOR callback on remote cpu
  */
 void hrtimer_pull(void)