linux-kernel - Re: [PATCH 02/20] dma-mapping: provide a generic dma-noncoherent implementation

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Date:   Sat, 19 May 2018 08:38:57 +0200
From:   "hch@....de" <hch@....de>
To:     Helge Deller <deller@....de>
Cc:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        "hch@....de" <hch@....de>,
        "deanbo422@...il.com" <deanbo422@...il.com>,
        "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nios2-dev@...ts.rocketboards.org" <nios2-dev@...ts.rocketboards.org>,
        "linux-m68k@...ts.linux-m68k.org" <linux-m68k@...ts.linux-m68k.org>,
        "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
        "linux-hexagon@...r.kernel.org" <linux-hexagon@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "green.hu@...il.com" <green.hu@...il.com>,
        "openrisc@...ts.librecores.org" <openrisc@...ts.librecores.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "monstr@...str.eu" <monstr@...str.eu>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        "linux-c6x-dev@...ux-c6x.org" <linux-c6x-dev@...ux-c6x.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH 02/20] dma-mapping: provide a generic dma-noncoherent
        implementation

On Fri, May 18, 2018 at 10:05:51PM +0200, Helge Deller wrote:
> This patch seems to fix the dma issues I faced on my 32bit B160L parisc box.
> 
> So it leaves only one open issue on parisc:
> Now every 32 bit parisc system is unnecessarily non-coherent.

I diagree with those comments, let me resend the refactored patch
to make it more clear.