posix-timers: Store k_clock pointer in k_itimer

Having the k_clock pointer in the k_itimer struct avoids the lookup in
several code pathes and makes the next steps of unification of the hrtimer
and alarmtimer based posix timers simpler.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20170530211656.641222072@linutronix.de

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 908048f488ae..8f9cca390cdb 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -56,6 +56,7 @@ struct cpu_timer_list {
  * @list:               List head for binding the timer to signals->posix_timers
  * @t_hash:             Entry in the posix timer hash table
  * @it_lock:            Lock protecting the timer
+ * @kclock:             Pointer to the k_clock struct handling this timer
  * @it_clock:           The posix timer clock id
  * @it_id:              The posix timer id for identifying the timer
  * @it_overrun:         The overrun counter for pending signals
@@ -75,6 +76,7 @@ struct k_itimer {
         struct list_head        list;
         struct hlist_node       t_hash;
         spinlock_t              it_lock;
+        const struct k_clock    *kclock;
         clockid_t               it_clock;
         timer_t                 it_id;
         int                     it_overrun;