Linux-Block Archive on lore.kernel.org
 help / color / Atom feed
From: Christoph Hellwig <hch@lst.de>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
	Khalid Aziz <khalid@gonehiking.org>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Matthew Wilcox <willy@infradead.org>,
	Hannes Reinecke <hare@suse.com>,
	Ondrej Zary <linux@rainbow-software.org>,
	linux-block@vger.kernel.org, linux-scsi@vger.kernel.org,
	Hannes Reinecke <hare@suse.de>
Subject: Re: [PATCH 8/8] block: stop calling blk_queue_bounce for passthrough requests
Date: Fri, 9 Apr 2021 09:40:34 +0200
Message-ID: <20210409074034.GA5636@lst.de> (raw)
In-Reply-To: <20210408214506.GA184625@roeck-us.net>

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++;
 

  reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-31  7:29 start removing block bounce buffering support v3 Christoph Hellwig
2021-03-31  7:29 ` [PATCH 1/8] aha1542: use a local bounce buffer Christoph Hellwig
2021-03-31  7:29 ` [PATCH 2/8] Buslogic: remove ISA support Christoph Hellwig
2021-03-31 18:24   ` Khalid Aziz
2021-04-03 16:58   ` Maciej W. Rozycki
2021-04-06  6:27     ` Christoph Hellwig
2021-04-06 15:42       ` Maciej W. Rozycki
2021-04-12 12:26     ` Maciej W. Rozycki
2021-03-31  7:29 ` [PATCH 3/8] BusLogic: reject broken old firmware that requires ISA-style bounce buffering Christoph Hellwig
2021-03-31  7:29 ` [PATCH 4/8] advansys: remove ISA support Christoph Hellwig
2021-03-31  7:59   ` Hannes Reinecke
2021-03-31  7:29 ` [PATCH 5/8] scsi: remove the unchecked_isa_dma flag Christoph Hellwig
2021-04-09 15:46   ` Steffen Maier
2021-04-10  6:52     ` Christoph Hellwig
2021-04-12 14:04       ` Steffen Maier
2021-03-31  7:29 ` [PATCH 6/8] block: remove BLK_BOUNCE_ISA support Christoph Hellwig
2021-03-31  7:30 ` [PATCH 7/8] block: refactor the bounce buffering code Christoph Hellwig
2021-03-31  7:30 ` [PATCH 8/8] block: stop calling blk_queue_bounce for passthrough requests Christoph Hellwig
2021-04-08 21:45   ` Guenter Roeck
2021-04-09  7:40     ` Christoph Hellwig [this message]
2021-04-09 13:04       ` Guenter Roeck
2021-04-06 15:28 ` start removing block bounce buffering support v3 Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2021-03-26  5:58 start removing block bounce buffering support v2 Christoph Hellwig
2021-03-26  5:58 ` [PATCH 8/8] block: stop calling blk_queue_bounce for passthrough requests Christoph Hellwig
2021-03-29  6:37   ` Hannes Reinecke
2021-03-18  6:39 start removing block bounce buffering support Christoph Hellwig
2021-03-18  6:39 ` [PATCH 8/8] block: stop calling blk_queue_bounce for passthrough requests Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210409074034.GA5636@lst.de \
    --to=hch@lst.de \
    --cc=axboe@kernel.dk \
    --cc=hare@suse.com \
    --cc=hare@suse.de \
    --cc=khalid@gonehiking.org \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-scsi@vger.kernel.org \
    --cc=linux@rainbow-software.org \
    --cc=linux@roeck-us.net \
    --cc=martin.petersen@oracle.com \
    --cc=willy@infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Block Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-block/0 linux-block/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-block linux-block/ https://lore.kernel.org/linux-block \
		linux-block@vger.kernel.org
	public-inbox-index linux-block

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-block


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git