mapping.c:undefined reference to `phys_to_dma'

Hi Christoph, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: dea8dcf2a9fa8cc540136a6cd885c3beece16ec3 commit: 5ceda74093a5c1c3f42a02b894df031f3bbc9af1 dma-direct: rename and cleanup __phys_to_dma date: 4 months a

mapping.c:undefined reference to `phys_to_dma'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: aae5ab854e38151e69f261dbf0e3b7e396403178 commit: 5ceda74093a5c1c3f42a02b894df031f3bbc9af1 dma-direct: rename and cleanup __phys_to_dma date: 3 months ago config: mips-randconfig-r031-20201129 (attached as