linux-kernel - Re: [PATCH 4/5] dma-direct: provide a arch_dma_clear

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Date:   Mon, 24 Feb 2020 22:56:57 +0100
From:   Christoph Hellwig <hch@....de>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Christoph Hellwig <hch@....de>, Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        openrisc@...ts.librecores.org, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] dma-direct: provide a arch_dma_clear_uncached hook

On Mon, Feb 24, 2020 at 01:53:28PM -0800, Ira Weiny wrote:
> > +	else if (IS_ENABLED(CONFIG_ARCH_HAS_DMA_CLEAR_UNCACHED))
> > +		arch_dma_clear_uncached(cpu_addr, size);
> 
> Isn't using arch_dma_clear_uncached() before patch 5 going to break
> bisectability?

Only if ARCH_HAS_DMA_CLEAR_UNCACHED is selected by anything, which
only happens in patch 5.