On Mon, Nov 12, 2012 at 4:13 PM, H Hartley Sweeten <hartl...@visionengravers.com> wrote: > On Monday, November 12, 2012 11:41 AM, Bjorn Helgaas wrote: >> On Mon, Nov 12, 2012 at 9:18 AM, H Hartley Sweeten wrote: >>> Does anyone know what the Kconfig option VIRT_TO_BUS does? >>> There are a number of "depends on" that option but it does not >>> seem to directly enable any code in the kernel. >> >> virt_to_bus() is a deprecated interface for converting a kernel >> virtual address to a bus address. It's deprecated because it's >> impossible to implement correctly when there are multiple bus address >> spaces, because you don't know which bus address space the caller has >> in mind. > > Thanks for the info. > > So if a driver does not use virt_to_bus() then the "depends on VIRT_TO_BUS" > is not necessary. Correct?
Yes, that's my understanding. -- 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/
