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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-09-06 19:04:44 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-09-19 21:44:28 +0200 |
| commit | 9a659f43dfea27cca423d4e80809be447f4c9ce7 (patch) | |
| tree | 199546092aa55bb1ed17bfb4b0a9badb21b9f6da | |
| parent | 75e12ed65312a56401f3b286ac7e12994301371c (diff) | |
| download | linux-0-day-9a659f43dfea27cca423d4e80809be447f4c9ce7.tar.gz linux-0-day-9a659f43dfea27cca423d4e80809be447f4c9ce7.tar.xz | |
block/softirq: Convert to hotplug state machine
Install the callbacks via the state machine.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160906170457.32393-9-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | block/blk-softirq.c | 27 | ||||
| -rw-r--r-- | include/linux/cpuhotplug.h | 1 |
2 files changed, 11 insertions, 17 deletions
diff --git a/block/blk-softirq.c b/block/blk-softirq.c index 53b1737e978d5..96631e6a22b96 100644 --- a/block/blk-softirq.c +++ b/block/blk-softirq.c @@ -78,30 +78,21 @@ static int raise_blk_irq(int cpu, struct request *rq) } #endif -static int blk_cpu_notify(struct notifier_block *self, unsigned long action, - void *hcpu) +static int blk_softirq_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_done, cpu), - this_cpu_ptr(&blk_cpu_done)); - raise_softirq_irqoff(BLOCK_SOFTIRQ); - local_irq_enable(); - } + local_irq_disable(); + list_splice_init(&per_cpu(blk_cpu_done, cpu), + this_cpu_ptr(&blk_cpu_done)); + raise_softirq_irqoff(BLOCK_SOFTIRQ); + local_irq_enable(); - return NOTIFY_OK; + return 0; } -static struct notifier_block blk_cpu_notifier = { - .notifier_call = blk_cpu_notify, -}; - void __blk_complete_request(struct request *req) { int ccpu, cpu; @@ -180,7 +171,9 @@ static __init int blk_softirq_init(void) INIT_LIST_HEAD(&per_cpu(blk_cpu_done, i)); open_softirq(BLOCK_SOFTIRQ, blk_done_softirq); - register_hotcpu_notifier(&blk_cpu_notifier); + cpuhp_setup_state_nocalls(CPUHP_BLOCK_SOFTIRQ_DEAD, + "block/softirq:dead", NULL, + blk_softirq_cpu_dead); return 0; } subsys_initcall(blk_softirq_init); diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index 2ca7b34871e0c..d4274d51fe279 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -23,6 +23,7 @@ enum cpuhp_state { CPUHP_ARM64_FPSIMD_DEAD, CPUHP_ARM_OMAP_WAKE_DEAD, CPUHP_IRQ_POLL_DEAD, + CPUHP_BLOCK_SOFTIRQ_DEAD, CPUHP_WORKQUEUE_PREP, CPUHP_POWER_NUMA_PREPARE, CPUHP_HRTIMERS_PREPARE, |