linux-kernel - Re: [PATCH v2] Add support for usbfs zerocopy.

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Date:	Tue, 12 Jan 2016 11:00:33 +0100
From:	Oliver Neukum <oneukum@...e.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	"Steinar H. Gunderson" <sesse@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lingzhu Xiang <lingzhu.xiang@...l.utoronto.ca>,
	Alan Stern <stern@...land.harvard.edu>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v2] Add support for usbfs zerocopy.

On Mon, 2016-01-11 at 11:15 -0500, Konrad Rzeszutek Wilk wrote:
> On Mon, Jan 11, 2016 at 12:08:26PM +0100, Oliver Neukum wrote:

> > I suspect many drivers to be unable to deal well with a failure.
> > Having this report makes "my device doesn't work" easier to solve
> > as a bug report.
> > 
> > Hence it seems to me that a driver which can handle a failure
> > with a good fallback should indicate this with a flag to the
> > VM layer.
> 
> s/VM/device layer?

Actually no, if a driver does something that cannot be satisfied at all,
that should be logged. What we would like to go away is the log entry
due to a failure to allocate memory under memory pressure or
fragmentation.

	Regards
		Oliver