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

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Message-ID: <20160106064949.GA14998@infradead.org>
Date:	Tue, 5 Jan 2016 22:49:49 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	"Steinar H. Gunderson" <sesse@...gle.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	stern@...land.harvard.edu
Subject: Re: [PATCH] Add support for usbfs zerocopy.

This is a completely broken usage of the mmap interface.  if you use
mmap on a device file you must use the actual mmap for the data
transfer.

Our interface for zero copy reads/writes is O_DIRECT, and that requires
not special memory allocation, just proper alignment.
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