On Fri, Aug 30, 2019 at 08:29:21AM +0200, Christoph Hellwig wrote: > The arm architecture had a VM_ARM_DMA_CONSISTENT flag to mark DMA > coherent remapping for a while. Lift this flag to common code so > that we can use it generically. We also check it in the only place > VM_USERMAP is directly check so that we can entirely replace that > flag as well (although I'm not even sure why we'd want to allow > remapping DMA appings, but I'd rather not change behavior).
Good, because if you did change that behaviour, you'd break almost every ARM framebuffer and cripple ARM audio drivers. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up
