+ /* ensure that the physically mapped memory is contiguous */ + DBUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL && + REGION_NUMBER(vdst) != RGN_UNCACHED && + PAGE_SIZE - (vdst & ~PAGE_MASK) < len); I thought that part of the point of this patch was that by using kmalloc() for the buffer, you actually guaranteed that the whole thing is contiguous (since kmalloc will give you an order(N) page for requests greater than a page. This test is a bit convoluted, but looks it will ping you whenever a transfer crosses a page boundary, regardless of whether the pages are contiguous or not. Certainly the comment seems tenuously connected to the code. -Tony - : send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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