The linux-next commit "libnvdimm/dax: Pick the right alignment default when creating dax devices" causes powerpc failed to build with this config. Reverted it fixed the issue.
ERROR: "hash__has_transparent_hugepage" [drivers/nvdimm/libnvdimm.ko] undefined! ERROR: "radix__has_transparent_hugepage" [drivers/nvdimm/libnvdimm.ko] undefined! make[1]: *** [scripts/Makefile.modpost:93: __modpost] Error 1 make: *** [Makefile:1305: modules] Error 2 [1] https://patchwork.kernel.org/patch/11133445/ [2] https://raw.githubusercontent.com/cailca/linux-mm/master/powerpc.config