hrtimers: Avoid touching inactive timer bases

Instead of iterating over all possible timer bases avoid it by marking
the active bases in the cpu base.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Peter Zijlstra <peterz@infradead.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index cc5f5f51db10..771c95802edc 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -143,7 +143,8 @@ struct hrtimer_sleeper {
  */
 struct hrtimer_clock_base {
         struct hrtimer_cpu_base *cpu_base;
-        clockid_t               index;
+        int                     index;
+        clockid_t               clockid;
         struct timerqueue_head  active;
         ktime_t                 resolution;
         ktime_t                 (*get_time)(void);
@@ -162,7 +163,7 @@ enum  hrtimer_base_type {
  * struct hrtimer_cpu_base - the per cpu clock bases
  * @lock:               lock protecting the base and associated clock bases
  *                      and timers
- * @clock_base:         array of clock bases for this cpu
+ * @active_bases:       Bitfield to mark bases with active timers
  * @expires_next:       absolute time of the next event which was scheduled
  *                      via clock_set_next_event()
  * @hres_active:        State of high resolution mode
@@ -171,9 +172,11 @@ enum  hrtimer_base_type {
  * @nr_retries:         Total number of hrtimer interrupt retries
  * @nr_hangs:           Total number of hrtimer interrupt hangs
  * @max_hang_time:      Maximum time spent in hrtimer_interrupt
+ * @clock_base:         array of clock bases for this cpu
  */
 struct hrtimer_cpu_base {
         raw_spinlock_t                  lock;
+        unsigned long                   active_bases;
 #ifdef CONFIG_HIGH_RES_TIMERS
         ktime_t                         expires_next;
         int                             hres_active;