linux-kernel - Re: [PATCH 1/3] uio: introduce UIO_DMA

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Message-ID: <20231002060937.GA911@lst.de>
Date:   Mon, 2 Oct 2023 08:09:37 +0200
From:   Christoph Hellwig <hch@....de>
To:     Chris Leech <cleech@...hat.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@....de>,
        Rasesh Mody <rmody@...vell.com>,
        Ariel Elior <aelior@...vell.com>,
        Sudarsana Kalluru <skalluru@...vell.com>,
        Manish Chopra <manishc@...vell.com>,
        Nilesh Javali <njavali@...vell.com>,
        Manish Rangankar <mrangankar@...vell.com>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        John Meneghini <jmeneghi@...hat.com>,
        Lee Duncan <lduncan@...e.com>,
        Mike Christie <michael.christie@...cle.com>,
        Hannes Reinecke <hare@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] uio: introduce UIO_DMA_COHERENT type

This is the right way to map dma coherent memory to userspace.
I have to say I agree with the doubts on what it is actually
trying to do, though.