mm/gup.c:1922:7: error: implicit declaration of function ‘is_valid_gup_flags’

[Naresh Kamboju]

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

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Linaro LKFT
https://lkft.linaro.org