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Asynchronous callbacks provided by call_rcu are particularly important for QEMU, because the BQL makes it hard to use synchronize_rcu. In addition, the current RCU implementation is not particularly friendly to multiple concurrent synchronize_rcu callers, making call_rcu even more important. Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>