linux-kernel - [tip:smp/hotplug] lib/irq_poll: Convert to hotplug state machine

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Message-ID: <tip-75e12ed65312a56401f3b286ac7e12994301371c@git.kernel.org>
Date:   Mon, 19 Sep 2016 12:54:40 -0700
From:   tip-bot for Sebastian Andrzej Siewior <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     bigeasy@...utronix.de, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...nel.org, axboe@...nel.dk, hpa@...or.com
Subject: [tip:smp/hotplug] lib/irq_poll: Convert to hotplug state machine

Commit-ID:  75e12ed65312a56401f3b286ac7e12994301371c
Gitweb:     http://git.kernel.org/tip/75e12ed65312a56401f3b286ac7e12994301371c
Author:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
AuthorDate: Tue, 6 Sep 2016 19:04:43 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 19 Sep 2016 21:44:27 +0200

lib/irq_poll: Convert to hotplug state machine

Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: rt@...utronix.de
Link: http://lkml.kernel.org/r/20160906170457.32393-8-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 include/linux/cpuhotplug.h |  1 +
 lib/irq_poll.c             | 26 +++++++++-----------------
 2 files changed, 10 insertions(+), 17 deletions(-)

diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 8dec2a2..2ca7b34 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -22,6 +22,7 @@ enum cpuhp_state {
 	CPUHP_CPUIDLE_DEAD,
 	CPUHP_ARM64_FPSIMD_DEAD,
 	CPUHP_ARM_OMAP_WAKE_DEAD,
+	CPUHP_IRQ_POLL_DEAD,
 	CPUHP_WORKQUEUE_PREP,
 	CPUHP_POWER_NUMA_PREPARE,
 	CPUHP_HRTIMERS_PREPARE,
diff --git a/lib/irq_poll.c b/lib/irq_poll.c
index 836f7db..2be5569 100644
--- a/lib/irq_poll.c
+++ b/lib/irq_poll.c
@@ -184,30 +184,21 @@ void irq_poll_init(struct irq_poll *iop, int weight, irq_poll_fn *poll_fn)
 }
 EXPORT_SYMBOL(irq_poll_init);
 
-static int irq_poll_cpu_notify(struct notifier_block *self,
-				 unsigned long action, void *hcpu)
+static int irq_poll_cpu_dead(unsigned int cpu)
 {
 	/*
 	 * If a CPU goes away, splice its entries to the current CPU
 	 * and trigger a run of the softirq
 	 */
-	if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
-		int cpu = (unsigned long) hcpu;
-
-		local_irq_disable();
-		list_splice_init(&per_cpu(blk_cpu_iopoll, cpu),
-				 this_cpu_ptr(&blk_cpu_iopoll));
-		__raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
-		local_irq_enable();
-	}
+	local_irq_disable();
+	list_splice_init(&per_cpu(blk_cpu_iopoll, cpu),
+			 this_cpu_ptr(&blk_cpu_iopoll));
+	__raise_softirq_irqoff(IRQ_POLL_SOFTIRQ);
+	local_irq_enable();
 
-	return NOTIFY_OK;
+	return 0;
 }
 
-static struct notifier_block irq_poll_cpu_notifier = {
-	.notifier_call	= irq_poll_cpu_notify,
-};
-
 static __init int irq_poll_setup(void)
 {
 	int i;
@@ -216,7 +207,8 @@ static __init int irq_poll_setup(void)
 		INIT_LIST_HEAD(&per_cpu(blk_cpu_iopoll, i));
 
 	open_softirq(IRQ_POLL_SOFTIRQ, irq_poll_softirq);
-	register_hotcpu_notifier(&irq_poll_cpu_notifier);
+	cpuhp_setup_state_nocalls(CPUHP_IRQ_POLL_DEAD, "irq_poll:dead", NULL,
+				  irq_poll_cpu_dead);
 	return 0;
 }
 subsys_initcall(irq_poll_setup);