> 2023年2月21日 19:46，Robin Murphy <robin.murphy@xxxxxxx> 写道： > > On 2023-02-21 18:15, Jiaxun Yang wrote: >>> 2023年2月21日 17:54，Christoph Hellwig <hch@xxxxxx> 写道： >>> >>> Can you explain the motivation here? Also why riscv patches are at >>> the end of a mips fіxes series? >> Ah sorry for any confusion. >> So the main purpose of this patch is to fix MIPS’s broken per-device coherency. >> To be more precise, we want to be able to control the default coherency for all devices probed from >> devicetree in early boot code. > > Including the patch which actually does that would be helpful. As it is, patches 4-7 here just appear to be moving an option around for no practical effect. Well the affect is default coherency of devicetree probed devices are now following dma_default_coherent instead of a static Kconfig option. For MIPS platform, dma_default_coherent will be determined by boot code. Thanks - Jiaxun
