Messages in this thread | | | Date | Tue, 11 Sep 2018 08:46:36 +0200 | From | Christoph Hellwig <> | Subject | Re: [PATCH 2/5] dma-mapping: move the dma_coherent flag to struct device |
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On Mon, Sep 10, 2018 at 06:13:50PM +0200, Greg Kroah-Hartman wrote: > > +#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ > > + defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ > > + defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) > > + bool dma_coherent:1; > > +#endif > > It's just one bit, why not always have it enabled here? If the arch > uses it or doesn't, no big deal. > > Or are you using this to "catch" arches that mess something up?
Yes, that is the intent - I don't want architectures to accidentally set it while not selecting the non-coherent infrastructure, as it won't have an effect.
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