Re: [PATCH 4/5] dma-direct: provide a arch_dma_clear_uncached hook

From: Christoph Hellwig
Date: Mon Feb 24 2020 - 16:57:03 EST


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.