title: TypeError: 'numpy.uint64' does not have the buffer interface
body: <p>i am using pycuda and i write this program</p>
  
  <pre><code>etat=np.zeros(XBLOCK * YBLOCK * XGRID * YGRID,dtype=np.uint)
  compteur_init=np.uint(0)
  clef_utilisateur=np.uint(SEED)
  config=clef_utilisateur
  
  compteur_init_gpu = cuda.mem_alloc(compteur_init.nbytes)
  etat_init_gpu=cuda.mem_alloc(etat.nbytes)
  cuda.memcpy_htod(compteur_init_gpu, compteur_init)
  cuda.memcpy_htod(etat_gpu, etat)
  </code></pre>
  
  <p>when i compile i get this error message </p>
  
  <pre><code>'numpy.uint64' does not have the buffer interface
  </code></pre>
  
  <p>what does it means exactly ??</p>