Nov. 1, 2011
10:32 a.m.
Dear all: My questions are below: 1. Are all struct page 32-bit aligned? If so, where is this part of code for handleing struct page be 32-bits aligned? 2. if the page of scatterlist is located at high mem, how does dma_map_sg mapping the virtual address? 3. in blk_rq_map_sg, it seems we only copy bvec->bv_page to sg->page_link why don't we add dma_address in bvec and send the bio directly to the lower level driver? 4. if I plug a USB HD with 3 partitions, will there be 3 request_queues? -- Regards,