linux-kernel - Re: [PATCH 4/7] dma-mapping: Always provide dma_default

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Message-ID: <54f204eb-79b5-5c1c-fffb-696939644d8c@arm.com>
Date:   Tue, 21 Feb 2023 19:35:05 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Christoph Hellwig <hch@....de>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, tsbogend@...ha.franken.de,
        mpe@...erman.id.au, paul.walmsley@...ive.com, palmer@...belt.com,
        robh+dt@...nel.org, m.szyprowski@...sung.com
Subject: Re: [PATCH 4/7] dma-mapping: Always provide dma_default_coherent

On 2023-02-21 17:58, Christoph Hellwig wrote:
> On Tue, Feb 21, 2023 at 12:46:10PM +0000, Jiaxun Yang wrote:
>> dma_default_coherent can be useful for determine default coherency
>> even on arches without noncoherent support.
> 
> How?

Indeed, "default" is conceptually meaningless when there is no possible 
alternative :/

Robin.