Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull CPU hotplug updates from Thomas Gleixner:
 "Yet another batch of cpu hotplug core updates and conversions:

   - Provide core infrastructure for multi instance drivers so the
     drivers do not have to keep custom lists.

   - Convert custom lists to the new infrastructure. The block-mq custom
     list conversion comes through the block tree and makes the diffstat
     tip over to more lines removed than added.

   - Handle unbalanced hotplug enable/disable calls more gracefully.

   - Remove the obsolete CPU_STARTING/DYING notifier support.

   - Convert another batch of notifier users.

   The relayfs changes which conflicted with the conversion have been
   shipped to me by Andrew.

   The remaining lot is targeted for 4.10 so that we finally can remove
   the rest of the notifiers"

* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (46 commits)
  cpufreq: Fix up conversion to hotplug state machine
  blk/mq: Reserve hotplug states for block multiqueue
  x86/apic/uv: Convert to hotplug state machine
  s390/mm/pfault: Convert to hotplug state machine
  mips/loongson/smp: Convert to hotplug state machine
  mips/octeon/smp: Convert to hotplug state machine
  fault-injection/cpu: Convert to hotplug state machine
  padata: Convert to hotplug state machine
  cpufreq: Convert to hotplug state machine
  ACPI/processor: Convert to hotplug state machine
  virtio scsi: Convert to hotplug state machine
  oprofile/timer: Convert to hotplug state machine
  block/softirq: Convert to hotplug state machine
  lib/irq_poll: Convert to hotplug state machine
  x86/microcode: Convert to hotplug state machine
  sh/SH-X3 SMP: Convert to hotplug state machine
  ia64/mca: Convert to hotplug state machine
  ARM/OMAP/wakeupgen: Convert to hotplug state machine
  ARM/shmobile: Convert to hotplug state machine
  arm64/FP/SIMD: Convert to hotplug state machine
  ...

1 files changed, 24 insertions, 32 deletions

diff --git a/arch/powerpc/mm/mmu_context_nohash.c b/arch/powerpc/mm/mmu_context_nohash.c
index 7d95bc402dba..c491f2c8f2b9 100644
--- a/arch/powerpc/mm/mmu_context_nohash.c
+++ b/arch/powerpc/mm/mmu_context_nohash.c
@@ -369,44 +369,34 @@ void destroy_context(struct mm_struct *mm)
 }
 
 #ifdef CONFIG_SMP
-
-static int mmu_context_cpu_notify(struct notifier_block *self,
-				  unsigned long action, void *hcpu)
+static int mmu_ctx_cpu_prepare(unsigned int cpu)
 {
-	unsigned int cpu = (unsigned int)(long)hcpu;
-
 	/* We don't touch CPU 0 map, it's allocated at aboot and kept
 	 * around forever
 	 */
 	if (cpu == boot_cpuid)
-		return NOTIFY_OK;
-
-	switch (action) {
-	case CPU_UP_PREPARE:
-	case CPU_UP_PREPARE_FROZEN:
-		pr_devel("MMU: Allocating stale context map for CPU %d\n", cpu);
-		stale_map[cpu] = kzalloc(CTX_MAP_SIZE, GFP_KERNEL);
-		break;
-#ifdef CONFIG_HOTPLUG_CPU
-	case CPU_UP_CANCELED:
-	case CPU_UP_CANCELED_FROZEN:
-	case CPU_DEAD:
-	case CPU_DEAD_FROZEN:
-		pr_devel("MMU: Freeing stale context map for CPU %d\n", cpu);
-		kfree(stale_map[cpu]);
-		stale_map[cpu] = NULL;
-
-		/* We also clear the cpu_vm_mask bits of CPUs going away */
-		clear_tasks_mm_cpumask(cpu);
-	break;
-#endif /* CONFIG_HOTPLUG_CPU */
-	}
-	return NOTIFY_OK;
+		return 0;
+
+	pr_devel("MMU: Allocating stale context map for CPU %d\n", cpu);
+	stale_map[cpu] = kzalloc(CTX_MAP_SIZE, GFP_KERNEL);
+	return 0;
 }
 
-static struct notifier_block mmu_context_cpu_nb = {
-	.notifier_call	= mmu_context_cpu_notify,
-};
+static int mmu_ctx_cpu_dead(unsigned int cpu)
+{
+#ifdef CONFIG_HOTPLUG_CPU
+	if (cpu == boot_cpuid)
+		return 0;
+
+	pr_devel("MMU: Freeing stale context map for CPU %d\n", cpu);
+	kfree(stale_map[cpu]);
+	stale_map[cpu] = NULL;
+
+	/* We also clear the cpu_vm_mask bits of CPUs going away */
+	clear_tasks_mm_cpumask(cpu);
+#endif
+	return 0;
+}
 
 #endif /* CONFIG_SMP */
 
@@ -469,7 +459,9 @@ void __init mmu_context_init(void)
 #else
 	stale_map[boot_cpuid] = memblock_virt_alloc(CTX_MAP_SIZE, 0);
 
-	register_cpu_notifier(&mmu_context_cpu_nb);
+	cpuhp_setup_state_nocalls(CPUHP_POWERPC_MMU_CTX_PREPARE,
+				  "powerpc/mmu/ctx:prepare",
+				  mmu_ctx_cpu_prepare, mmu_ctx_cpu_dead);
 #endif
 
 	printk(KERN_INFO