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-rw-r--r--include/linux/cpuhotplug.h2
-rw-r--r--include/linux/smp.h5
-rw-r--r--kernel/cpu.c9
-rw-r--r--kernel/smp.c79
4 files changed, 48 insertions, 47 deletions
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 78170827a776..b5cf01ace71b 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -18,6 +18,7 @@ enum cpuhp_state {
CPUHP_HRTIMERS_PREPARE,
CPUHP_PROFILE_PREPARE,
CPUHP_X2APIC_PREPARE,
+ CPUHP_SMPCFD_PREPARE,
CPUHP_TIMERS_DEAD,
CPUHP_NOTIFY_PREPARE,
CPUHP_BRINGUP_CPU,
@@ -57,6 +58,7 @@ enum cpuhp_state {
CPUHP_AP_ARM_CORESIGHT4_STARTING,
CPUHP_AP_ARM64_ISNDEP_STARTING,
CPUHP_AP_LEDTRIG_STARTING,
+ CPUHP_AP_SMPCFD_DYING,
CPUHP_AP_X86_TBOOT_DYING,
CPUHP_AP_NOTIFY_STARTING,
CPUHP_AP_ONLINE,
diff --git a/include/linux/smp.h b/include/linux/smp.h
index c4414074bd88..eccae4690f41 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -196,4 +196,9 @@ extern void arch_enable_nonboot_cpus_end(void);
void smp_setup_processor_id(void);
+/* SMP core functions */
+int smpcfd_prepare_cpu(unsigned int cpu);
+int smpcfd_dead_cpu(unsigned int cpu);
+int smpcfd_dying_cpu(unsigned int cpu);
+
#endif /* __LINUX_SMP_H */
diff --git a/kernel/cpu.c b/kernel/cpu.c
index e1017d92d308..008e2fd40cb1 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1195,6 +1195,11 @@ static struct cpuhp_step cpuhp_bp_states[] = {
.startup = hrtimers_prepare_cpu,
.teardown = hrtimers_dead_cpu,
},
+ [CPUHP_SMPCFD_PREPARE] = {
+ .name = "SMPCFD prepare",
+ .startup = smpcfd_prepare_cpu,
+ .teardown = smpcfd_dead_cpu,
+ },
[CPUHP_TIMERS_DEAD] = {
.name = "timers dead",
.startup = NULL,
@@ -1218,6 +1223,10 @@ static struct cpuhp_step cpuhp_bp_states[] = {
.teardown = NULL,
.cant_stop = true,
},
+ [CPUHP_AP_SMPCFD_DYING] = {
+ .startup = NULL,
+ .teardown = smpcfd_dying_cpu,
+ },
/*
* Handled on controll processor until the plugged processor manages
* this itself.
diff --git a/kernel/smp.c b/kernel/smp.c
index 74165443c240..7180491c9678 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -33,69 +33,54 @@ static DEFINE_PER_CPU_SHARED_ALIGNED(struct llist_head, call_single_queue);
static void flush_smp_call_function_queue(bool warn_cpu_offline);
-static int
-hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
+int smpcfd_prepare_cpu(unsigned int cpu)
{
- long cpu = (long)hcpu;
struct call_function_data *cfd = &per_cpu(cfd_data, cpu);
- switch (action) {
- case CPU_UP_PREPARE:
- case CPU_UP_PREPARE_FROZEN:
- if (!zalloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL,
- cpu_to_node(cpu)))
- return notifier_from_errno(-ENOMEM);
- cfd->csd = alloc_percpu(struct call_single_data);
- if (!cfd->csd) {
- free_cpumask_var(cfd->cpumask);
- return notifier_from_errno(-ENOMEM);
- }
- break;
-
-#ifdef CONFIG_HOTPLUG_CPU
- case CPU_UP_CANCELED:
- case CPU_UP_CANCELED_FROZEN:
- /* Fall-through to the CPU_DEAD[_FROZEN] case. */
-
- case CPU_DEAD:
- case CPU_DEAD_FROZEN:
+ if (!zalloc_cpumask_var_node(&cfd->cpumask, GFP_KERNEL,
+ cpu_to_node(cpu)))
+ return -ENOMEM;
+ cfd->csd = alloc_percpu(struct call_single_data);
+ if (!cfd->csd) {
free_cpumask_var(cfd->cpumask);
- free_percpu(cfd->csd);
- break;
+ return -ENOMEM;
+ }
- case CPU_DYING:
- case CPU_DYING_FROZEN:
- /*
- * The IPIs for the smp-call-function callbacks queued by other
- * CPUs might arrive late, either due to hardware latencies or
- * because this CPU disabled interrupts (inside stop-machine)
- * before the IPIs were sent. So flush out any pending callbacks
- * explicitly (without waiting for the IPIs to arrive), to
- * ensure that the outgoing CPU doesn't go offline with work
- * still pending.
- */
- flush_smp_call_function_queue(false);
- break;
-#endif
- };
+ return 0;
+}
+
+int smpcfd_dead_cpu(unsigned int cpu)
+{
+ struct call_function_data *cfd = &per_cpu(cfd_data, cpu);
- return NOTIFY_OK;
+ free_cpumask_var(cfd->cpumask);
+ free_percpu(cfd->csd);
+ return 0;
}
-static struct notifier_block hotplug_cfd_notifier = {
- .notifier_call = hotplug_cfd,
-};
+int smpcfd_dying_cpu(unsigned int cpu)
+{
+ /*
+ * The IPIs for the smp-call-function callbacks queued by other
+ * CPUs might arrive late, either due to hardware latencies or
+ * because this CPU disabled interrupts (inside stop-machine)
+ * before the IPIs were sent. So flush out any pending callbacks
+ * explicitly (without waiting for the IPIs to arrive), to
+ * ensure that the outgoing CPU doesn't go offline with work
+ * still pending.
+ */
+ flush_smp_call_function_queue(false);
+ return 0;
+}
void __init call_function_init(void)
{
- void *cpu = (void *)(long)smp_processor_id();
int i;
for_each_possible_cpu(i)
init_llist_head(&per_cpu(call_single_queue, i));
- hotplug_cfd(&hotplug_cfd_notifier, CPU_UP_PREPARE, cpu);
- register_cpu_notifier(&hotplug_cfd_notifier);
+ smpcfd_prepare_cpu(smp_processor_id());
}
/*