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From: Jens Axboe <axboe@kernel.dk>
To: Christoph Hellwig <hch@lst.de>,
	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>
Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: start removing block bounce buffering support v3
Date: Tue, 6 Apr 2021 09:28:48 -0600	[thread overview]
Message-ID: <11664576-758d-7e8e-bf95-ff9c82cab927@kernel.dk> (raw)
In-Reply-To: <20210331073001.46776-1-hch@lst.de>

On 3/31/21 1:29 AM, Christoph Hellwig wrote:
> Hi all,
> 
> this series starts to clean up and remove the impact of the legacy old
> block layer bounce buffering code.
> 
> First it removes support for ISA bouncing.  This was used by three SCSI
> drivers.  One of them actually had an active user and developer 5 years
> ago so I've converted it to use a local bounce buffer - Ondrej, can you
> test the coversion?  The next one has been known broken for years, and
> the third one looks like it has no users for the ISA support so they
> are just dropped.
> 
> It then removes support for dealing with bounce buffering highmem pages
> for passthrough requests as we can just use the copy instead of the map
> path for them.  This will reduce efficiency for such setups on highmem
> systems (e.g. usb-storage attached DVD drives), but then again that is
> what you get for using a driver not using modern interfaces on a 32-bit
> highmem system.  It does allow to streamline the common path pretty nicely.

Applied, thanks.

-- 
Jens Axboe


      parent reply	other threads:[~2021-04-06 15:28 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-31  7:29 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
2021-04-09 13:04       ` Guenter Roeck
2021-04-06 15:28 ` Jens Axboe [this message]

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