On Tue, Jun 08, 2021 at 06:05:56PM +0200, Christoph Hellwig wrote:
>
> rq_for_each_segment(bvec, req, iter) {
> - unsigned long flags;
> - dev_dbg(&dev->sbd.core, "%s:%u: bio %u: %u sectors from %llu\n",
> - __func__, __LINE__, i, bio_sectors(iter.bio),
> - iter.bio->bi_iter.bi_sector);
> -
> - size = bvec.bv_len;
> - buf = bvec_kmap_irq(&bvec, &flags);
> if (gather)
> - memcpy(dev->bounce_buf+offset, buf, size);
> + memcpy_from_bvec(dev->bounce_buf + offset, &bvec);
> else
> - memcpy(buf, dev->bounce_buf+offset, size);
> - offset += size;
> - flush_kernel_dcache_page(bvec.bv_page);
I'm still not 100% sure that these flushes are needed but the are not no-ops on
every arch. Would it be best to preserve them after the memcpy_to/from_bvec()?
Same thing in patch 11 and 14.
Ira
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