blk-mq/cpu-notif: Convert to new hotplug state machine

Replace the block-mq notifier list management with the multi instance
facility in the cpu hotplug state machine.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-block@vger.kernel.org
Cc: rt@linutronix.de
Cc: Christoph Hellwing <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 0 insertions, 67 deletions

diff --git a/block/blk-mq-cpu.c b/block/blk-mq-cpu.c
deleted file mode 100644
index bb3ed488f7b5..000000000000
--- a/block/blk-mq-cpu.c
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- * CPU notifier helper code for blk-mq
- *
- * Copyright (C) 2013-2014 Jens Axboe
- */
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/blkdev.h>
-#include <linux/list.h>
-#include <linux/llist.h>
-#include <linux/smp.h>
-#include <linux/cpu.h>
-
-#include <linux/blk-mq.h>
-#include "blk-mq.h"
-
-static LIST_HEAD(blk_mq_cpu_notify_list);
-static DEFINE_RAW_SPINLOCK(blk_mq_cpu_notify_lock);
-
-static int blk_mq_main_cpu_notify(struct notifier_block *self,
-				  unsigned long action, void *hcpu)
-{
-	unsigned int cpu = (unsigned long) hcpu;
-	struct blk_mq_cpu_notifier *notify;
-	int ret = NOTIFY_OK;
-
-	raw_spin_lock(&blk_mq_cpu_notify_lock);
-
-	list_for_each_entry(notify, &blk_mq_cpu_notify_list, list) {
-		ret = notify->notify(notify->data, action, cpu);
-		if (ret != NOTIFY_OK)
-			break;
-	}
-
-	raw_spin_unlock(&blk_mq_cpu_notify_lock);
-	return ret;
-}
-
-void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
-{
-	BUG_ON(!notifier->notify);
-
-	raw_spin_lock(&blk_mq_cpu_notify_lock);
-	list_add_tail(&notifier->list, &blk_mq_cpu_notify_list);
-	raw_spin_unlock(&blk_mq_cpu_notify_lock);
-}
-
-void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
-{
-	raw_spin_lock(&blk_mq_cpu_notify_lock);
-	list_del(&notifier->list);
-	raw_spin_unlock(&blk_mq_cpu_notify_lock);
-}
-
-void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
-			      int (*fn)(void *, unsigned long, unsigned int),
-			      void *data)
-{
-	notifier->notify = fn;
-	notifier->data = data;
-}
-
-void __init blk_mq_cpu_init(void)
-{
-	hotcpu_notifier(blk_mq_main_cpu_notify, 0);
-}