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From 5deee6753f583147f213b46951835c512c5068ff Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 13 Nov 2011 17:17:09 +0100
Subject: [PATCH 219/323] softirq: Check preemption after reenabling interrupts
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.215-rt107.tar.xz
raise_softirq_irqoff() disables interrupts and wakes the softirq
daemon, but after reenabling interrupts there is no preemption check,
so the execution of the softirq thread might be delayed arbitrarily.
In principle we could add that check to local_irq_enable/restore, but
that's overkill as the rasie_softirq_irqoff() sections are the only
ones which show this behaviour.
Reported-by: Carsten Emde <cbe@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/preempt.h | 3 +++
lib/irq_poll.c | 5 +++++
net/core/dev.c | 7 +++++++
3 files changed, 15 insertions(+)
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 5ceac863e7298..fb140e00f74dc 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -190,8 +190,10 @@ do { \
#ifdef CONFIG_PREEMPT_RT
# define preempt_enable_no_resched() sched_preempt_enable_no_resched()
+# define preempt_check_resched_rt() preempt_check_resched()
#else
# define preempt_enable_no_resched() preempt_enable()
+# define preempt_check_resched_rt() barrier();
#endif
#define preemptible() (preempt_count() == 0 && !irqs_disabled())
@@ -262,6 +264,7 @@ do { \
#define preempt_disable_notrace() barrier()
#define preempt_enable_no_resched_notrace() barrier()
#define preempt_enable_notrace() barrier()
+#define preempt_check_resched_rt() barrier()
#define preemptible() 0
#endif /* CONFIG_PREEMPT_COUNT */
diff --git a/lib/irq_poll.c b/lib/irq_poll.c
index 2f17b488d58e1..7557bf7ecf1f1 100644
--- a/lib/irq_poll.c
+++ b/lib/irq_poll.c
@@ -37,6 +37,7 @@ void irq_poll_sched(struct irq_poll *iop)
list_add_tail(&iop->list, this_cpu_ptr(&blk_cpu_iopoll));
raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
local_irq_restore(flags);
+ preempt_check_resched_rt();
}
EXPORT_SYMBOL(irq_poll_sched);
@@ -72,6 +73,7 @@ void irq_poll_complete(struct irq_poll *iop)
local_irq_save(flags);
__irq_poll_complete(iop);
local_irq_restore(flags);
+ preempt_check_resched_rt();
}
EXPORT_SYMBOL(irq_poll_complete);
@@ -96,6 +98,7 @@ static void __latent_entropy irq_poll_softirq(struct softirq_action *h)
}
local_irq_enable();
+ preempt_check_resched_rt();
/* Even though interrupts have been re-enabled, this
* access is safe because interrupts can only add new
@@ -133,6 +136,7 @@ static void __latent_entropy irq_poll_softirq(struct softirq_action *h)
__raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
local_irq_enable();
+ preempt_check_resched_rt();
}
/**
@@ -196,6 +200,7 @@ static int irq_poll_cpu_dead(unsigned int cpu)
this_cpu_ptr(&blk_cpu_iopoll));
__raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
local_irq_enable();
+ preempt_check_resched_rt();
return 0;
}
diff --git a/net/core/dev.c b/net/core/dev.c
index 0e2c433bebcd4..55d0c53864989 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3052,6 +3052,7 @@ static void __netif_reschedule(struct Qdisc *q)
sd->output_queue_tailp = &q->next_sched;
raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_restore(flags);
+ preempt_check_resched_rt();
}
void __netif_schedule(struct Qdisc *q)
@@ -3114,6 +3115,7 @@ void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
__this_cpu_write(softnet_data.completion_queue, skb);
raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_restore(flags);
+ preempt_check_resched_rt();
}
EXPORT_SYMBOL(__dev_kfree_skb_irq);
@@ -4604,6 +4606,7 @@ static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
rps_unlock(sd);
local_irq_restore(flags);
+ preempt_check_resched_rt();
atomic_long_inc(&skb->dev->rx_dropped);
kfree_skb(skb);
@@ -6356,12 +6359,14 @@ static void net_rps_action_and_irq_enable(struct softnet_data *sd)
sd->rps_ipi_list = NULL;
local_irq_enable();
+ preempt_check_resched_rt();
/* Send pending IPI's to kick RPS processing on remote cpus. */
net_rps_send_ipi(remsd);
} else
#endif
local_irq_enable();
+ preempt_check_resched_rt();
}
static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
@@ -6439,6 +6444,7 @@ void __napi_schedule(struct napi_struct *n)
local_irq_save(flags);
____napi_schedule(this_cpu_ptr(&softnet_data), n);
local_irq_restore(flags);
+ preempt_check_resched_rt();
}
EXPORT_SYMBOL(__napi_schedule);
@@ -10970,6 +10976,7 @@ static int dev_cpu_dead(unsigned int oldcpu)
raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_enable();
+ preempt_check_resched_rt();
#ifdef CONFIG_RPS
remsd = oldsd->rps_ipi_list;
--
2.44.0
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