Unverified Commit 055844c7 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!3519 tick/broadcast-hrtimer: Prevent the timer device on broadcast duty CPU from being disabled 

Merge Pull Request from: @ci-robot 
 
PR sync from: Yu Liao <liaoyu15@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/FNEQCJFA6TYJTDXAQVQU2DXHIEQNZLKH/ 
 
https://gitee.com/openeuler/kernel/issues/I8PL17 
 
Link:https://gitee.com/openeuler/kernel/pulls/3519

 

Reviewed-by: default avatarXiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: default avatarJialin Zhang <zhangjialin11@huawei.com>
parents 0ffcd407 6cfb70fb

kernel/time/tick-broadcast-hrtimer.c

+14 −0
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ static int bc_shutdown(struct clock_event_device *evt) 
 */

static int bc_set_next(ktime_t expires, struct clock_event_device *bc)

{

	struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);



	/*

	 * This is called either from enter/exit idle code or from the

	 * broadcast handler. In all cases tick_broadcast_lock is held.
@@ -62,6 +64,18 @@ static int bc_set_next(ktime_t expires, struct clock_event_device *bc) 
	 * hrtimer_start() can call into tracing.

	 */

	RCU_NONIDLE( {



		/*

		 * This can be called from CPU offline operation to move broadcast

		 * assignment. If tick_broadcast_force_mask is set, the CPU local

		 * timer device may be disabled. And hrtimer_reprogram() will not

		 * called if the timer is not the first expiring timer. Reprogram

		 * the cpu local timer device to ensure we can take over the

		 * broadcast duty.

		 */

		if (tick_check_broadcast_expired() && expires >= dev->next_event)

			clockevents_program_event(dev, dev->next_event, 1);



		hrtimer_start(&bctimer, expires, HRTIMER_MODE_ABS_PINNED_HARD);

		/*

		 * The core tick broadcast mode expects bc->bound_on to be set