[PATCH v3 26/51] time/tick-broadcast: Remove RCU_NONIDLE usage

Peter Zijlstra
2023-01-12T20:02:57Z

No callers left that have already disabled RCU.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
---
kernel/time/tick-broadcast-hrtimer.c | 29 ++++++++++++-----------------
1 file changed, 12 insertions(+), 17 deletions(-)

--- a/kernel/time/tick-broadcast-hrtimer.c
+++ b/kernel/time/tick-broadcast-hrtimer.c
@@ -56,25 +56,20 @@ static int bc_set_next(ktime_t expires,
* hrtimer callback function is currently running, then
* hrtimer_start() cannot move it and the timer stays on the CPU on
* which it is assigned at the moment.
+ */
+ hrtimer_start(&bctimer, expires, HRTIMER_MODE_ABS_PINNED_HARD);
+ /*
+ * The core tick broadcast mode expects bc->bound_on to be set
+ * correctly to prevent a CPU which has the broadcast hrtimer
+ * armed from going deep idle.
*
- * As this can be called from idle code, the hrtimer_start()
- * invocation has to be wrapped with RCU_NONIDLE() as
- * hrtimer_start() can call into tracing.
+ * As tick_broadcast_lock is held, nothing can change the cpu
+ * base which was just established in hrtimer_start() above. So
+ * the below access is safe even without holding the hrtimer
+ * base lock.
*/
- RCU_NONIDLE( {
- hrtimer_start(&bctimer, expires, HRTIMER_MODE_ABS_PINNED_HARD);
- /*
- * The core tick broadcast mode expects bc->bound_on to be set
- * correctly to prevent a CPU which has the broadcast hrtimer
- * armed from going deep idle.
- *
- * As tick_broadcast_lock is held, nothing can change the cpu
- * base which was just established in hrtimer_start() above. So
- * the below access is safe even without holding the hrtimer
- * base lock.
- */
- bc->bound_on = bctimer.base->cpu_base->cpu;
- } );
+ bc->bound_on = bctimer.base->cpu_base->cpu;
+
return 0;
}