linux-kernel - [PATCH net-next] net/sched: sch_cbq: Delete unused delay

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Date:   Wed, 13 Jul 2022 13:40:51 -0700
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
Cc:     Peilin Ye <peilin.ye@...edance.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Cong Wang <cong.wang@...edance.com>,
        Peilin Ye <yepeilin.cs@...il.com>
Subject: [PATCH net-next] net/sched: sch_cbq: Delete unused delay_timer

From: Peilin Ye <peilin.ye@...edance.com>

delay_timer has been unused since commit c3498d34dd36 ("cbq: remove
TCA_CBQ_OVL_STRATEGY support").  Delete it.

Signed-off-by: Peilin Ye <peilin.ye@...edance.com>
---
 net/sched/sch_cbq.c | 79 ---------------------------------------------
 1 file changed, 79 deletions(-)

diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index 02d9f0dfe356..599e26fc2fa8 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -149,7 +149,6 @@ struct cbq_sched_data {
 	psched_time_t		now;		/* Cached timestamp */
 	unsigned int		pmask;
 
-	struct hrtimer		delay_timer;
 	struct qdisc_watchdog	watchdog;	/* Watchdog timer,
 						   started when CBQ has
 						   backlog, but cannot
@@ -441,81 +440,6 @@ static void cbq_overlimit(struct cbq_class *cl)
 	}
 }
 
-static psched_tdiff_t cbq_undelay_prio(struct cbq_sched_data *q, int prio,
-				       psched_time_t now)
-{
-	struct cbq_class *cl;
-	struct cbq_class *cl_prev = q->active[prio];
-	psched_time_t sched = now;
-
-	if (cl_prev == NULL)
-		return 0;
-
-	do {
-		cl = cl_prev->next_alive;
-		if (now - cl->penalized > 0) {
-			cl_prev->next_alive = cl->next_alive;
-			cl->next_alive = NULL;
-			cl->cpriority = cl->priority;
-			cl->delayed = 0;
-			cbq_activate_class(cl);
-
-			if (cl == q->active[prio]) {
-				q->active[prio] = cl_prev;
-				if (cl == q->active[prio]) {
-					q->active[prio] = NULL;
-					return 0;
-				}
-			}
-
-			cl = cl_prev->next_alive;
-		} else if (sched - cl->penalized > 0)
-			sched = cl->penalized;
-	} while ((cl_prev = cl) != q->active[prio]);
-
-	return sched - now;
-}
-
-static enum hrtimer_restart cbq_undelay(struct hrtimer *timer)
-{
-	struct cbq_sched_data *q = container_of(timer, struct cbq_sched_data,
-						delay_timer);
-	struct Qdisc *sch = q->watchdog.qdisc;
-	psched_time_t now;
-	psched_tdiff_t delay = 0;
-	unsigned int pmask;
-
-	now = psched_get_time();
-
-	pmask = q->pmask;
-	q->pmask = 0;
-
-	while (pmask) {
-		int prio = ffz(~pmask);
-		psched_tdiff_t tmp;
-
-		pmask &= ~(1<<prio);
-
-		tmp = cbq_undelay_prio(q, prio, now);
-		if (tmp > 0) {
-			q->pmask |= 1<<prio;
-			if (tmp < delay || delay == 0)
-				delay = tmp;
-		}
-	}
-
-	if (delay) {
-		ktime_t time;
-
-		time = 0;
-		time = ktime_add_ns(time, PSCHED_TICKS2NS(now + delay));
-		hrtimer_start(&q->delay_timer, time, HRTIMER_MODE_ABS_PINNED);
-	}
-
-	__netif_schedule(qdisc_root(sch));
-	return HRTIMER_NORESTART;
-}
-
 /*
  * It is mission critical procedure.
  *
@@ -1034,7 +958,6 @@ cbq_reset(struct Qdisc *sch)
 	q->tx_class = NULL;
 	q->tx_borrowed = NULL;
 	qdisc_watchdog_cancel(&q->watchdog);
-	hrtimer_cancel(&q->delay_timer);
 	q->toplevel = TC_CBQ_MAXLEVEL;
 	q->now = psched_get_time();
 
@@ -1162,8 +1085,6 @@ static int cbq_init(struct Qdisc *sch, struct nlattr *opt,
 	int err;
 
 	qdisc_watchdog_init(&q->watchdog, sch);
-	hrtimer_init(&q->delay_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
-	q->delay_timer.function = cbq_undelay;
 
 	err = cbq_opt_parse(tb, opt, extack);
 	if (err < 0)
-- 
2.20.1