linux-kernel - Re: [RFC 2/3] USB: core: Add non-coherent buffer allocation helpers

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Message-ID: <20180830175850.GA11521@infradead.org>
Date:   Thu, 30 Aug 2018 10:58:50 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ezequiel Garcia <ezequiel@...labora.com>
Cc:     linux-media@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Tomasz Figa <tfiga@...omium.org>,
        "Matwey V . Kornilov" <matwey@....msu.ru>,
        Alan Stern <stern@...land.harvard.edu>, kernel@...labora.com,
        Keiichi Watanabe <keiichiw@...omium.org>
Subject: Re: [RFC 2/3] USB: core: Add non-coherent buffer allocation helpers

Please don't introduce new DMA_ATTR_NON_CONSISTENT users, it is
a rather horrible interface, and I plan to kill it off rather sooner
than later.  I plan to post some patches for a better interface
that can reuse the normal dma_sync_single_* interfaces for ownership
transfers.  I can happily include usb in that initial patch set based
on your work here if that helps.