On Fri, 4 Jan 2002, Ilya Volynets wrote: > On Friday 04 January 2002 11:33 am, you wrote: > This is true in theory. In practice you have to look at kmalloc implementation > and how it uses GFP_DMA. I don't remember anything arch specific in there, > but I never seriously dug in that part. I believe it doesn't do what we need, > otherwice We'd be using it for pci_alloc_consistent. Well, both pci_alloc_consistent and kmalloc will end up calling __get_free_pages, with the GFP_DMA flag set. On setup, with the MIPS64 arch, DMA memory is set to start in non-cacheable space (don't know how). So both pci_alloc_consistent and kmalloc(GFP_DMA,...) will return DMA safe (i.e. non cacheable) memory. see mm/slab.c (for kmalloc and how it finally calls __get_free_pages). regards, Vivien Chappelier.
