On Mon, Apr 9, 2018 at 1:52 PM, Rob Herring <r...@kernel.org> wrote: > On Mon, Apr 9, 2018 at 2:46 AM, Oliver O'Halloran <ooh...@gmail.com> wrote: >> Some OF platforms (pseries and some SPARC systems) has their own >> implementations of NUMA affinity detection rather than using the generic >> OF_NUMA driver, which mainly exists for arm64. For other platforms one >> of two fallbacks provided by the base OF driver are used depending on >> CONFIG_NUMA. >> >> In the CONFIG_NUMA=n case the fallback is an inline function in of.h. >> In the =y case the fallback is a real function which is defined as a >> weak symbol so that it may be overwritten by the architecture if desired. >> >> The problem with this arrangement is that the real implementations all >> export of_node_to_nid(). Unfortunately it's not possible to export the >> fallback since it would clash with the non-weak version. As a result >> we get build failures when: >> >> a) CONFIG_NUMA=y && CONFIG_OF=y, and >> b) The platform doesn't implement of_node_to_nid(), and >> c) A module uses of_node_to_nid() >> >> Given b) will be true for most platforms this is fairly easy to hit >> and has been observed on ia64 and x86. > > How specifically do we hit this? The only module I see using > of_node_to_nid in mainline is Cell EDAC driver.
The of_pmem driver is using it currently pending for a 4.17 pull request. Stephen hit the compile failure in -next.
