On Tue, Mar 22, 2016 at 03:53:02PM +0530, Sodagudi Prasad wrote: > > Hi All, > > Would like to check whether the dma_map_single_attrs() API, can accept ptr > variable from high memory or not?
It can't. Direct mapped, lowmem only. No pointers allowed from dma_alloc_coherent(), dma_alloc_writecombine(), ioremap(), vmalloc(), kmap(), kmap_atomic() or similar function, or derived from one of these. -- RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.
