[PATCH 20/21] blk: mq: cpu-notif: Convert to hotplug state machine

[Sebastian Andrzej Siewior]

Install the callbacks via the state machine. The only currently handled
callback is CPU_DEAD and this one is converted.

Cc: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
This patch against linux-next to take the block changes into account. It
depends on "blk: mq: reserve hotplug ID states for block"

 block/blk-mq-cpu.c     |   15 +++++++--------
 block/blk-mq.c         |   17 ++++-------------
 block/blk-mq.h         |    2 +-
 include/linux/blk-mq.h |    2 +-
 4 files changed, 13 insertions(+), 23 deletions(-)

--- a/block/blk-mq-cpu.c
+++ b/block/blk-mq-cpu.c
@@ -18,18 +18,16 @@
 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)
+static int blk_mq_main_cpu_dead(unsigned int cpu)
 {
-       unsigned int cpu = (unsigned long) hcpu;
        struct blk_mq_cpu_notifier *notify;
-       int ret = NOTIFY_OK;
+       int ret;
 
        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)
+               ret = notify->notify(notify->data, cpu);
+               if (ret)
                        break;
        }
 
@@ -54,7 +52,7 @@ void blk_mq_unregister_cpu_notifier(stru
 }
 
 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
-                             int (*fn)(void *, unsigned long, unsigned int),
+                             int (*fn)(void *, unsigned int),
                              void *data)
 {
        notifier->notify = fn;
@@ -63,5 +61,6 @@ void blk_mq_init_cpu_notifier(struct blk
 
 void __init blk_mq_cpu_init(void)
 {
-       hotcpu_notifier(blk_mq_main_cpu_notify, 0);
+       cpuhp_setup_state_nocalls(CPUHP_BLKMQ_DEAD, "block/mq:dead", NULL,
+                                 blk_mq_main_cpu_dead);
 }
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1649,7 +1649,7 @@ static int blk_mq_hctx_cpu_offline(struc
        spin_unlock(&ctx->lock);
 
        if (list_empty(&tmp))
-               return NOTIFY_OK;
+               return 0;
 
        ctx = blk_mq_get_ctx(q);
        spin_lock(&ctx->lock);
@@ -1669,23 +1669,14 @@ static int blk_mq_hctx_cpu_offline(struc
 
        blk_mq_run_hw_queue(hctx, true);
        blk_mq_put_ctx(ctx);
-       return NOTIFY_OK;
+       return 0;
 }
 
-static int blk_mq_hctx_notify(void *data, unsigned long action,
-                             unsigned int cpu)
+static int blk_mq_hctx_notify(void *data, unsigned int cpu)
 {
        struct blk_mq_hw_ctx *hctx = data;
 
-       if (action == CPU_DEAD || action == CPU_DEAD_FROZEN)
-               return blk_mq_hctx_cpu_offline(hctx, cpu);
-
-       /*
-        * In case of CPU online, tags may be reallocated
-        * in blk_mq_map_swqueue() after mapping is updated.
-        */
-
-       return NOTIFY_OK;
+       return blk_mq_hctx_cpu_offline(hctx, cpu);
 }
 
 /* hctx->ctxs will be freed in queue's release handler */
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -36,7 +36,7 @@ void blk_mq_wake_waiters(struct request_
  */
 struct blk_mq_cpu_notifier;
 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
-                             int (*fn)(void *, unsigned long, unsigned int),
+                             int (*fn)(void *, unsigned int),
                              void *data);
 void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
 void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -9,7 +9,7 @@ struct blk_flush_queue;
 struct blk_mq_cpu_notifier {
        struct list_head list;
        void *data;
-       int (*notify)(void *data, unsigned long action, unsigned int cpu);
+       int (*notify)(void *data, unsigned int cpu);
 };
 
 struct blk_mq_ctxmap {