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Date: Mon, 28 May 2018 07:33:38 +0200
From: Christoph Hellwig <hch@lst.de>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Finn Thain <fthain@telegraphics.com.au>,
        Joshua Thompson <funaho@jurai.org>, Greg Ungerer <gerg@linux-m68k.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>, linux-m68k@vger.kernel.org,
        linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
        iommu@lists.linux-foundation.org
Subject: Re: [RFC PATCH] m68k: set dma and coherent masks for Macintosh
        SONIC based ethernet
Message-ID: <20180528053338.GA3195@lst.de>
References: <1527378785-13326-1-git-send-email-linux@roeck-us.net> <alpine.LNX.2.21.1805271212480.9@nippy.intranet> <20180527041505.GB31985@roeck-us.net>
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On Sat, May 26, 2018 at 09:15:05PM -0700, Guenter Roeck wrote:
> Good point. Maybe it would be better to limit the warning to SMP systems
> instead of (unnecessarily) fixing drivers all over the place ?

No.  The coherent_dma_mask is the mask used for dma_alloc_coherent and
dma_alloc_attrs.  It has nothing to do with cache coherent in SMP
systems.