[tip: sched/hrtick] sched: Avoid ktime_get() indirection

[tip-bot2 for Thomas Gleixner]

The following commit has been merged into the sched/hrtick branch of tip:

Commit-ID:     d70c1080a957a5144e6c40e95bcbe04ab542fe05
Gitweb:        https://git.kernel.org/tip/d70c1080a957a5144e6c40e95bcbe04ab542fe05
Author:        Thomas Gleixner <tglx@xxxxxxxxxx>
AuthorDate:    Tue, 24 Feb 2026 17:35:32 +01:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Fri, 27 Feb 2026 16:40:04 +01:00

sched: Avoid ktime_get() indirection

The clock of the hrtick and deadline timers is known to be CLOCK_MONOTONIC.
No point in looking it up via hrtimer_cb_get_time().

Just use ktime_get() directly.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20260224163429.001511662@xxxxxxxxxx
---
 kernel/sched/core.c     | 3 +--
 kernel/sched/deadline.c | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7597776..a716cc6 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -925,7 +925,6 @@ static void __hrtick_start(void *arg)
  */
 void hrtick_start(struct rq *rq, u64 delay)
 {
-	struct hrtimer *timer = &rq->hrtick_timer;
 	s64 delta;
 
 	/*
@@ -933,7 +932,7 @@ void hrtick_start(struct rq *rq, u64 delay)
 	 * doesn't make sense and can cause timer DoS.
 	 */
 	delta = max_t(s64, delay, 10000LL);
-	rq->hrtick_time = ktime_add_ns(hrtimer_cb_get_time(timer), delta);
+	rq->hrtick_time = ktime_add_ns(ktime_get(), delta);
 
 	if (rq == this_rq())
 		__hrtick_restart(rq);
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index d08b004..9d619a4 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1097,7 +1097,7 @@ static int start_dl_timer(struct sched_dl_entity *dl_se)
 		act = ns_to_ktime(dl_next_period(dl_se));
 	}
 
-	now = hrtimer_cb_get_time(timer);
+	now = ktime_get();
 	delta = ktime_to_ns(now) - rq_clock(rq);
 	act = ktime_add_ns(act, delta);