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Use set_bit_atomic() and bitmap_set_atomic() so that multiple threads can dirty memory without race conditions. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <1417519399-3166-4-git-send-email-stefanha@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>