linux-kernel - Re: [PATCH v2 5/5] of: address: Always use dma_default

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Date:   Wed, 1 Mar 2023 14:06:13 +0100
From:   Christoph Hellwig <hch@....de>
To:     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, hch@....de, m.szyprowski@...sung.com,
        robin.murphy@....com, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 5/5] of: address: Always use dma_default_coherent
 for default coherency

> -	select OF_DMA_DEFAULT_COHERENT		if !NOT_COHERENT_CACHE

Doesn't powerpc need to select CONFIG_ARCH_DMA_DEFAULT_COHERENT now,
or even better should be doing that in the patch adding that
symbol?

In fact I wonder if adding CONFIG_ARCH_DMA_DEFAULT_COHERENT and removing
OF_DMA_DEFAULT_COHERENT should be one patch, as that seems to bring
over the intent a little better I'd say.