4630 clean stale references to ddi_iopb_alloc and ddi_iopb_free
4634 undocument scsi_hba_attach() and ddi_dma_lim(9s)

@@ -689,13 +689,12 @@
  * mapped by the DMA handle up to date. It should be used
  * by a driver after the receipt of data from the device to
  * the memory object is done (over the range specified by
  * the other arguments to the ddi_dma_sync(9F) call).
  *
- * If the only mapping that concerns the driver is one for the
- * kernel (such as memory allocated by ddi_iopb_alloc(9F)), the
- * flag DDI_DMA_SYNC_FORKERNEL can be used. This is a hint to the
+ * If the only mapping that concerns the driver is one for the kernel,
+ * the flag DDI_DMA_SYNC_FORKERNEL can be used. This is a hint to the
  * system that if it can synchronize the kernel's view faster
  * that the CPU's view, it can do so, otherwise it acts the
  * same as DDI_DMA_SYNC_FORCPU. DDI_DMA_SYNC_FORKERNEL might
  * speed up the synchronization of kernel mappings in case of
  * non IO-coherent CPU caches.