From: Kristoffer Glembo <kristoffer@xxxxxxxxxxx> Date: Wed, 18 Nov 2009 09:45:41 +0100 > But I noticed that pci_map_single does not work in later kernels. > I guess it stopped working with the patch "sparc: Use > asm-generic/pci-dma-compat" since before the that the physical address > was obtained through virt_to_phys() and after that it goes through > page_to_phys(virt_to_page()) which does not work. Using > page_address(virt_to_page()) works but I understand that this does not > always evaluate properly. "page_address(virt_to_page())" returns a virtual address, whereas page_to_phys(virt_to_page()) returns a physical one. > Using page_to_phys(virt_to_page()) results in an address lacking the > phys_base offset. If it's not adding in phys_base, then it's not returning a legal physical address. Any idea why we don't add phys_base here? I feel like we've discussed this exactly recently, like in the past few months. -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
