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[S390] appldata: avoid deadlock with appldata_mem
The appldata_ops callbacks are called with a spin_lock held. But the appldata_mem callback then calls all_vm_events(), which calls get_online_cpus(), which might sleep. This possible deadlock is fixed by using a mutex instead of a spin_lock. Signed-off-by: Gerald Schaefer <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
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