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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 <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>