On 10/12/2012 08:15 AM, Andi Kleen wrote: >> Could you also add a blurb in the Documentation/< appropriate file >> for device driver writes> mentioning the usage of __pa_symbol is >> preferred? > Device driver writer's shouldn't use any of this anyways, they should always > use the PCI DMA APIs and never DMA to the stack or to static variables. > > -Andi
__pa_symbol is very architecture specific. From what I can tell it only exists for the x86 and mips architectures. If a device driver is expected to function on things such as PowerPC you cannot use it. Everything I have read indicates that for virtual to physical translation in drivers it is preferred to use virt_to_phys, not __pa or __pa_symbol. Thanks, Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
