linux-kernel - Re: [PATCH 3/3] cnic,bnx2,bnx2x: use UIO_MEM_DMA

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Date:   Sat, 30 Sep 2023 09:06:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Chris Leech <cleech@...hat.com>
Cc:     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 3/3] cnic,bnx2,bnx2x: use UIO_MEM_DMA_COHERENT

On Fri, Sep 29, 2023 at 10:00:23AM -0700, Chris Leech wrote:
> Make use of the new UIO_MEM_DMA_COHERENT type to properly handle mmap
> for dma_alloc_coherent buffers.

Why are ethernet drivers messing around with UIO devices?  That's not
what UIO is for, unless you are trying to do kernel bypass for these
devices without anyone noticing?

confused,

greg k-h