Commit 7cc277b4 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Thomas Gleixner

drivers base/cacheinfo: Convert to hotplug state machine

Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs. No functional change.
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20161103145021.28528-13-bigeasy@linutronix.deSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent dfbbd86a
...@@ -498,57 +498,30 @@ static int cache_add_dev(unsigned int cpu) ...@@ -498,57 +498,30 @@ static int cache_add_dev(unsigned int cpu)
return rc; return rc;
} }
static void cache_remove_dev(unsigned int cpu) static int cacheinfo_cpu_online(unsigned int cpu)
{ {
if (!cpumask_test_cpu(cpu, &cache_dev_map)) int rc = detect_cache_attributes(cpu);
return;
cpumask_clear_cpu(cpu, &cache_dev_map);
cpu_cache_sysfs_exit(cpu); if (rc)
return rc;
rc = cache_add_dev(cpu);
if (rc)
free_cache_attributes(cpu);
return rc;
} }
static int cacheinfo_cpu_callback(struct notifier_block *nfb, static int cacheinfo_cpu_pre_down(unsigned int cpu)
unsigned long action, void *hcpu)
{ {
unsigned int cpu = (unsigned long)hcpu; if (cpumask_test_and_clear_cpu(cpu, &cache_dev_map))
int rc = 0; cpu_cache_sysfs_exit(cpu);
switch (action & ~CPU_TASKS_FROZEN) { free_cache_attributes(cpu);
case CPU_ONLINE: return 0;
rc = detect_cache_attributes(cpu);
if (!rc)
rc = cache_add_dev(cpu);
break;
case CPU_DEAD:
cache_remove_dev(cpu);
free_cache_attributes(cpu);
break;
}
return notifier_from_errno(rc);
} }
static int __init cacheinfo_sysfs_init(void) static int __init cacheinfo_sysfs_init(void)
{ {
int cpu, rc = 0; return cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "base/cacheinfo:online",
cacheinfo_cpu_online, cacheinfo_cpu_pre_down);
cpu_notifier_register_begin();
for_each_online_cpu(cpu) {
rc = detect_cache_attributes(cpu);
if (rc)
goto out;
rc = cache_add_dev(cpu);
if (rc) {
free_cache_attributes(cpu);
pr_err("error populating cacheinfo..cpu%d\n", cpu);
goto out;
}
}
__hotcpu_notifier(cacheinfo_cpu_callback, 0);
out:
cpu_notifier_register_done();
return rc;
} }
device_initcall(cacheinfo_sysfs_init); device_initcall(cacheinfo_sysfs_init);
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