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如何禁用ARM上的热插拔CPU？

tag-icon • tag-icon linux kernel linux-kernel embedded arm
如何禁用ARM上的热插拔CPU？

我有一块运行 Linux 5.4.47 的 ARM64 Cortex-A72 板。我想检查CPU热插拔是否正常工作（我想使用的一个项目需要它）。

内核已CONFIG_HOTPLUG_CPU启用，但我没有/sys/devices/system/cpu/cpuX/online任何 CPU -我不知道如何关闭 CPU。

/sys/devices/system/cpu]# ls -l
total 0
-r--r--r--    1 root     root        4.0K Jan  1 00:00 consumers
drwxr-xr-x    7 root     root           0 Jan  1 00:00 cpu0
drwxr-xr-x    7 root     root           0 Jan  1 00:00 cpu1
drwxr-xr-x    7 root     root           0 Jan  1 00:00 cpu2
drwxr-xr-x    7 root     root           0 Jan  1 00:00 cpu3
drwxr-xr-x    2 root     root           0 Jan  1 00:00 cpuidle
drwxr-xr-x    2 root     root           0 Jan  1 00:00 hotplug
-r--r--r--    1 root     root        4.0K Jan  1 00:00 isolated
-r--r--r--    1 root     root        4.0K Jan  1 00:00 kernel_max
-r--r--r--    1 root     root        4.0K Jan  1 00:00 modalias
-r--r--r--    1 root     root        4.0K Jan  1 00:00 nohz_full
-r--r--r--    1 root     root        4.0K Jan  1 00:13 offline
-r--r--r--    1 root     root        4.0K Jan  1 00:00 online
-r--r--r--    1 root     root        4.0K Jan  1 00:00 possible
drwxr-xr-x    2 root     root           0 Jan  1 00:00 power
-r--r--r--    1 root     root        4.0K Jan  1 00:00 present
drwxr-xr-x    2 root     root           0 Jan  1 00:00 smt
-r--r--r--    1 root     root        4.0K Jan  1 00:00 suppliers
-rw-r--r--    1 root     root        4.0K Jan  1 00:00 uevent
drwxr-xr-x    2 root     root           0 Jan  1 00:00 vulnerabilities

/sys/devices/system/cpu/cpu2]# ls -l
total 0
drwxr-xr-x    5 root     root           0 Jan  1 00:07 cache
-r--r--r--    1 root     root        4.0K Jan  1 00:06 consumers
-r--r--r--    1 root     root        4.0K Jan  1 00:06 cpu_capacity
-r--------    1 root     root        4.0K Jan  1 00:06 crash_notes
-r--------    1 root     root        4.0K Jan  1 00:06 crash_notes_size
drwxr-xr-x    2 root     root           0 Jan  1 00:06 hotplug
lrwxrwxrwx    1 root     root           0 Jan  1 00:06 node0 -> ../../node/node0
lrwxrwxrwx    1 root     root           0 Jan  1 00:06 of_node -> ../../../../firmware/devicetree/base/cpus/cpu@2
drwxr-xr-x    2 root     root           0 Jan  1 00:06 power
drwxr-xr-x    3 root     root           0 Jan  1 00:12 regs
lrwxrwxrwx    1 root     root           0 Jan  1 00:06 subsystem -> ../../../../bus/cpu
-r--r--r--    1 root     root        4.0K Jan  1 00:06 suppliers
drwxr-xr-x    2 root     root           0 Jan  1 00:03 topology
-rw-r--r--    1 root     root        4.0K Jan  1 00:06 uevent

包含hotplug文件target,state和fail.包含、、、和。power​​runtime_active_timepm_qos_resume_latency_usruntime_statusautosuspend_delay_msruntime_suspended_timecontrol

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