On Fri, Mar 16, 2018 at 8:51 AM, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: > Hi all, > > If NO_DMA=y, get_dma_ops() returns a reference to the non-existing > symbol bad_dma_ops, thus causing a link failure if it is ever used. > > The intention of this is twofold: > 1. To catch users of the DMA API on systems that do no support the DMA > mapping API, > 2. To avoid building drivers that cannot work on such systems anyway. > > However, the disadvantage is that we have to keep on adding dependencies > on HAS_DMA all over the place. > > Thanks to the COMPILE_TEST symbol, lots of drivers now depend on one or > more platform dependencies (that imply HAS_DMA) || COMPILE_TEST, thus > already covering intention #2. Having to add an explicit dependency on > HAS_DMA here is cumbersome, and hinders compile-testing. The same can be said for CONFIG_IOMEM and CONFIG_OF. Any plans to remove those too? CONFIG_IOMEM is mostly just a !CONFIG_UM option. Rob _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
