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powerpc/mmu nohash: 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: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: rt@linutronix.de
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/20160818125731.27256-17-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-08-18 14:57:31 +02:00 committed by Thomas Gleixner
parent 68e694dcef
commit da3ed6519b
2 changed files with 24 additions and 31 deletions
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54
arch/powerpc/mm/mmu_context_nohash.c
View File

@ -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;
return 0;
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;
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

1
include/linux/cpuhotplug.h
View File

@ -32,6 +32,7 @@ enum cpuhp_state {
CPUHP_RCUTREE_PREP,
CPUHP_CPUIDLE_COUPLED_PREPARE,
CPUHP_POWERPC_PMAC_PREPARE,
CPUHP_POWERPC_MMU_CTX_PREPARE,
CPUHP_NOTIFY_PREPARE,
CPUHP_TIMERS_DEAD,
CPUHP_BRINGUP_CPU,