On Sat, 2016-01-02 at 19:35 +0100, Mike Looijmans wrote: > On 2-1-2016 11:39, Russell King - ARM Linux wrote: > > On Thu, Dec 31, 2015 at 04:50:54PM +0900, Masahiro Yamada wrote: > > > Hi. > > > > > > I am new to the Linux DMA APIs. > > > > > > First, I started by reading Documentation/DMA-API.txt, > > > but I am confused with the term "consistent memory". > > > > Just read "coherent memory" instead - the documentation confusingly > > uses > > the two terms to refer to the same thing. I think there was a > > patch a > > while back to replace "consistent" with "coherent" in this > > document, > > though I'm not sure what happened to it. > > I wrote that patch. I never got any comments on it, so either I > didn't > post it to the right people, or no one really cares: > http://www.kernelhub.org/?msg=747166&p=2 > > I still think that if the kernel methods all have "coherent" in their > name, we should use the word "coherent" in the documentation as well, > and not confuse people even further. So I'd happily repost that > patch. They don't: the PCI API still uses consistent: asm-generic/pci-dma-compat.h:pci_alloc_consistent(struct pci_dev *hwdev, size_t size, asm-generic/pci-dma-compat.h:pci_zalloc_consistent(struct pci_dev *hwdev, size_t size, asm-generic/pci-dma-compat.h:pci_free_consistent(struct pci_dev *hwdev, size_t size, asm-generic/pci-dma-compat.h:static inline int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask) linux/pci.h:/* kmem_cache style wrapper around pci_alloc_consistent() */ linux/pci.h:static inline int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask) These are named based on the PCI specification. James -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
