mapping.c:undefined reference to `dma_to_phys'

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: 7bc5c428a660d4d1bc95ba54bf4cb6bccf8c3029 dma-direct: remove __dma_to_phys date: 4 months ago config: m

mapping.c:undefined reference to `dma_to_phys'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 45e885c439e825c19f3a51e46ef8210984bc0a9c commit: 7bc5c428a660d4d1bc95ba54bf4cb6bccf8c3029 dma-direct: remove __dma_to_phys date: 3 months ago config: mips-randconfig-r031-20201129 (attached as .config) com