Revamped hrtimer_start_on() support

This patch modifies the previous implementation of hrtimer_start_on() by
now using smp_call_function_single_async() to arm hrtimers on remote
CPU's.

1 files changed, 23 insertions, 0 deletions

diff --git a/include/litmus/litmus.h b/include/litmus/litmus.h
index a6eb534ee0fa..c3a52aea60fb 100644
--- a/include/litmus/litmus.h
+++ b/include/litmus/litmus.h
@@ -319,4 +319,27 @@ static inline int has_control_page(struct task_struct* t)
 
 #endif
 
+#ifdef CONFIG_SMP
+
+/*
+ * struct hrtimer_start_on_info - timer info on remote cpu
+ * @timer:      timer to be triggered on remote cpu
+ * @time:       time event
+ * @mode:       timer mode
+ * @csd:        smp_call_function parameter to call hrtimer_pull on remote cpu
+ */
+struct hrtimer_start_on_info {
+        struct hrtimer          *timer;
+        ktime_t                 time;
+        enum hrtimer_mode       mode;
+        struct call_single_data csd;
+};
+
+void hrtimer_pull(void *csd_info);
+extern void hrtimer_start_on(int cpu, struct hrtimer_start_on_info *info,
+                        struct hrtimer *timer, ktime_t time,
+                        const enum hrtimer_mode mode);
+
+#endif
+
 #endif