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4b0b68af37
Subsystems that want to register CPU hotplug callbacks, as well as perform initialization for the CPUs that are already online, often do it as shown below: get_online_cpus(); for_each_online_cpu(cpu) init_cpu(cpu); register_cpu_notifier(&foobar_cpu_notifier); put_online_cpus(); This is wrong, since it is prone to ABBA deadlocks involving the cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently with CPU hotplug operations). Instead, the correct and race-free way of performing the callback registration is: cpu_notifier_register_begin(); for_each_online_cpu(cpu) init_cpu(cpu); /* Note the use of the double underscored version of the API */ __register_cpu_notifier(&foobar_cpu_notifier); cpu_notifier_register_done(); Fix the debug-monitors code in arm64 by using this latter form of callback registration. Cc: Catalin Marinas <[email protected]> Cc: Russell King <[email protected]> Cc: Ingo Molnar <[email protected]> Acked-by: Will Deacon <[email protected]> Signed-off-by: Srivatsa S. Bhat <[email protected]> Signed-off-by: Rafael J. Wysocki <[email protected]> |
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| kernel | ||
| kvm | ||
| lib | ||
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| Kconfig | ||
| Kconfig.debug | ||
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