On Thu, Apr 08, 2021 at 02:45:06PM -0700, Guenter Roeck wrote: > On Wed, Mar 31, 2021 at 09:30:01AM +0200, Christoph Hellwig wrote: > > Instead of overloading the passthrough fast path with the deprecated > > block layer bounce buffering let the users that combine an old > > undermaintained driver with a highmem system pay the price by always > > falling back to copies in that case. > > > > Hmm, that price is pretty high. When trying to boot sh images from usb, > it results in a traceback, followed by an i/o error, and the drive > fails to open. That's just because this warning is completely bogus, sorry. Does this patch fix the boot for you? diff --git a/block/blk-map.c b/block/blk-map.c index dac78376acc899..3743158ddaeb76 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -485,9 +485,6 @@ int blk_rq_append_bio(struct request *rq, struct bio *bio) struct bio_vec bv; unsigned int nr_segs = 0; - if (WARN_ON_ONCE(rq->q->limits.bounce != BLK_BOUNCE_NONE)) - return -EINVAL; - bio_for_each_bvec(bv, bio, iter) nr_segs++;
