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authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 19:25:04 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 19:25:04 -0800
commite71c3978d6f97659f6c3ee942c3e581299e4adf2 (patch)
tree0b58c76a20a79f5f5d9ada5731aa1dbb149fbcdc /arch/sparc
parentf797484c26300fec842fb669c69a3a60eb66e240 (diff)
parentb18cc3de00ec3442cf40ac60787dbe0703b99e24 (diff)
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull smp hotplug updates from Thomas Gleixner: "This is the final round of converting the notifier mess to the state machine. The removal of the notifiers and the related infrastructure will happen around rc1, as there are conversions outstanding in other trees. The whole exercise removed about 2000 lines of code in total and in course of the conversion several dozen bugs got fixed. The new mechanism allows to test almost every hotplug step standalone, so usage sites can exercise all transitions extensively. There is more room for improvement, like integrating all the pointlessly different architecture mechanisms of synchronizing, setting cpus online etc into the core code" * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (60 commits) tracing/rb: Init the CPU mask on allocation soc/fsl/qbman: Convert to hotplug state machine soc/fsl/qbman: Convert to hotplug state machine zram: Convert to hotplug state machine KVM/PPC/Book3S HV: Convert to hotplug state machine arm64/cpuinfo: Convert to hotplug state machine arm64/cpuinfo: Make hotplug notifier symmetric mm/compaction: Convert to hotplug state machine iommu/vt-d: Convert to hotplug state machine mm/zswap: Convert pool to hotplug state machine mm/zswap: Convert dst-mem to hotplug state machine mm/zsmalloc: Convert to hotplug state machine mm/vmstat: Convert to hotplug state machine mm/vmstat: Avoid on each online CPU loops mm/vmstat: Drop get_online_cpus() from init_cpu_node_state/vmstat_cpu_dead() tracing/rb: Convert to hotplug state machine oprofile/nmi timer: Convert to hotplug state machine net/iucv: Use explicit clean up labels in iucv_init() x86/pci/amd-bus: Convert to hotplug state machine x86/oprofile/nmi: Convert to hotplug state machine ...
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/kernel/sysfs.c45
1 files changed, 9 insertions, 36 deletions
diff --git a/arch/sparc/kernel/sysfs.c b/arch/sparc/kernel/sysfs.c
index fa8e21abb5e0..4808b6d23455 100644
--- a/arch/sparc/kernel/sysfs.c
+++ b/arch/sparc/kernel/sysfs.c
@@ -221,7 +221,7 @@ static struct device_attribute cpu_core_attrs[] = {
static DEFINE_PER_CPU(struct cpu, cpu_devices);
-static void register_cpu_online(unsigned int cpu)
+static int register_cpu_online(unsigned int cpu)
{
struct cpu *c = &per_cpu(cpu_devices, cpu);
struct device *s = &c->dev;
@@ -231,11 +231,12 @@ static void register_cpu_online(unsigned int cpu)
device_create_file(s, &cpu_core_attrs[i]);
register_mmu_stats(s);
+ return 0;
}
-#ifdef CONFIG_HOTPLUG_CPU
-static void unregister_cpu_online(unsigned int cpu)
+static int unregister_cpu_online(unsigned int cpu)
{
+#ifdef CONFIG_HOTPLUG_CPU
struct cpu *c = &per_cpu(cpu_devices, cpu);
struct device *s = &c->dev;
int i;
@@ -243,33 +244,10 @@ static void unregister_cpu_online(unsigned int cpu)
unregister_mmu_stats(s);
for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
device_remove_file(s, &cpu_core_attrs[i]);
-}
-#endif
-
-static int sysfs_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
-{
- unsigned int cpu = (unsigned int)(long)hcpu;
-
- switch (action) {
- case CPU_ONLINE:
- case CPU_ONLINE_FROZEN:
- register_cpu_online(cpu);
- break;
-#ifdef CONFIG_HOTPLUG_CPU
- case CPU_DEAD:
- case CPU_DEAD_FROZEN:
- unregister_cpu_online(cpu);
- break;
#endif
- }
- return NOTIFY_OK;
+ return 0;
}
-static struct notifier_block sysfs_cpu_nb = {
- .notifier_call = sysfs_cpu_notify,
-};
-
static void __init check_mmu_stats(void)
{
unsigned long dummy1, err;
@@ -294,26 +272,21 @@ static void register_nodes(void)
static int __init topology_init(void)
{
- int cpu;
+ int cpu, ret;
register_nodes();
check_mmu_stats();
- cpu_notifier_register_begin();
-
for_each_possible_cpu(cpu) {
struct cpu *c = &per_cpu(cpu_devices, cpu);
register_cpu(c, cpu);
- if (cpu_online(cpu))
- register_cpu_online(cpu);
}
- __register_cpu_notifier(&sysfs_cpu_nb);
-
- cpu_notifier_register_done();
-
+ ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "sparc/topology:online",
+ register_cpu_online, unregister_cpu_online);
+ WARN_ON(ret < 0);
return 0;
}