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path: root/drivers/base/arch_topology.c
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Diffstat (limited to 'drivers/base/arch_topology.c')
-rw-r--r--drivers/base/arch_topology.c38
1 files changed, 26 insertions, 12 deletions
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 5aaa0865625d..018ac202de34 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -219,20 +219,34 @@ static DECLARE_WORK(update_topology_flags_work, update_topology_flags_workfn);
static DEVICE_ATTR_RO(cpu_capacity);
-static int register_cpu_capacity_sysctl(void)
+static int cpu_capacity_sysctl_add(unsigned int cpu)
{
- int i;
- struct device *cpu;
+ struct device *cpu_dev = get_cpu_device(cpu);
- for_each_possible_cpu(i) {
- cpu = get_cpu_device(i);
- if (!cpu) {
- pr_err("%s: too early to get CPU%d device!\n",
- __func__, i);
- continue;
- }
- device_create_file(cpu, &dev_attr_cpu_capacity);
- }
+ if (!cpu_dev)
+ return -ENOENT;
+
+ device_create_file(cpu_dev, &dev_attr_cpu_capacity);
+
+ return 0;
+}
+
+static int cpu_capacity_sysctl_remove(unsigned int cpu)
+{
+ struct device *cpu_dev = get_cpu_device(cpu);
+
+ if (!cpu_dev)
+ return -ENOENT;
+
+ device_remove_file(cpu_dev, &dev_attr_cpu_capacity);
+
+ return 0;
+}
+
+static int register_cpu_capacity_sysctl(void)
+{
+ cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "topology/cpu-capacity",
+ cpu_capacity_sysctl_add, cpu_capacity_sysctl_remove);
return 0;
}