linux-kernel - Re: [PATCH] dma-mapping: Relax warnings for per-device areas

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Date:   Thu, 19 Jul 2018 15:16:19 +0200
From:   Christoph Hellwig <hch@....de>
To:     Geoff Levand <geoff@...radead.org>
Cc:     Fredrik Noring <noring@...rew.org>, Christoph Hellwig <hch@....de>,
        Robin Murphy <robin.murphy@....com>, m.szyprowski@...sung.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        JuergenUrban@....de
Subject: Re: [PATCH] dma-mapping: Relax warnings for per-device areas

On Wed, Jul 18, 2018 at 02:55:59PM -0700, Geoff Levand wrote:
> Hi,
> 
> On 07/17/2018 09:33 AM, Fredrik Noring wrote:
> >>> Here are three other regressions related to the coherent mask WARN_ON_ONCE:
> >>
> >> They are a pretty strong indication that yes, you should really set
> >> the coherent mask if you ever do coherent allocations..
> > 
> > I'm unfortunately unfamiliar with the USB drivers for the PS3. Geoff, what
> > do you think about setting a coherent mask?
> 
> I guess we need to add a dma_set_coherent_mask() call in the driver
> probe routines.  I'll send out a patch.

Yes, exactly!