Re: start removing block bounce buffering support v3

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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




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