arm and riscv architecture build failed on linux next 20200820 tag. make -sk KBUILD_BUILD_USER=TuxBuild -C/linux -j16 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- HOSTCC=gcc CC="sccache arm-linux-gnueabihf-gcc" O=build zImage 348# 349../mm/gup.c: In function ‘get_user_pages’: 350../mm/gup.c:1922:7: error: implicit declaration of function ‘is_valid_gup_flags’ [-Werror=implicit-function-declaration] 351 1922 | if (!is_valid_gup_flags(gup_flags)) 352 | ^~~~~~~~~~~~~~~~~~ 353cc1: some warnings being treated as errors Full build log, https://gitlab.com/Linaro/lkft/kernel-runs/-/jobs/695005038 https://gitlab.com/Linaro/lkft/kernel-runs/-/jobs/695005042 -- Linaro LKFT https://lkft.linaro.org