x86_64 defconfig builds failed on Linux next-20220823 tag with clang toolchain.

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

Regressions found on x86_64: - build-clang-13-x86_64_defconfig - build-clang-14-lkftconfig-kcsan - build-clang-nightly-lkftconfig - build-clang-11-x86_64_defconfig - build-clang-14-lkftconfig - build-clang-nightly-x86_64_defconfig - build-clang-14-x86_64_defconfig - build-clang-13-lkftconfig - build-clang-12-x86_64_defconfig - build-clang-12-lkftconfig

Regressions found on i386: - build-clang-11-defconfig - build-clang-nightly-lkftconfig - build-clang-nightly-defconfig - build-clang-14-lkftconfig - build-clang-14-defconfig - build-clang-12-defconfig - build-clang-13-lkftconfig - build-clang-13-defconfig - build-clang-12-lkftconfig

make --silent --keep-going --jobs=8 O=/home/tux - build-.cache/tuxmake/builds/1/build LLVM=1 LLVM_IAS=1 ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu- 'HOSTCC=sccache clang' 'CC=sccache clang' olddefconfig .config:5286:warning: override: UNWINDER_FRAME_POINTER changes choice state make --silent --keep-going --jobs=8 O=/home/tux - build-.cache/tuxmake/builds/1/build LLVM=1 LLVM_IAS=1 ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu- 'HOSTCC=sccache clang' 'CC=sccache clang'

mm/pagewalk.c:318:12: error: variable 'err' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] else if (ops->pte_hole) ^~~~~~~~~~~~~ mm/pagewalk.c:321:7: note: uninitialized use occurs here if (err) ^~~ mm/pagewalk.c:318:8: note: remove the 'if' if its condition is always true else if (ops->pte_hole) ^~~~~~~~~~~~~~~~~~ mm/pagewalk.c:311:10: note: initialize the variable 'err' to silence this warning int err; ^ = 0 1 error generated.

metadata: Build: https://builds.tuxbuild.com/2DkF28RfJ2VeMSGwDNhsXXu3dbo/ config: https://builds.tuxbuild.com/2DkF28RfJ2VeMSGwDNhsXXu3dbo/config git_describe: next-20220823 git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next git_sha: 05477f3653b82d8b3bcf39d2937d9893124976db git_short_log: 05477f3653b8 ("Add linux-next specific files for 20220823") toolchain: clang

Steps to reproduce: ------------------------ # To install tuxmake on your system globally: # sudo pip3 install -U tuxmake # # See https://docs.tuxmake.org/ for complete documentation. # Original tuxmake command with fragments listed below.

# tuxmake --runtime podman --target-arch x86_64 --toolchain clang-14 --kconfig x86_64_defconfig LLVM=1 LLVM_IAS=1

-- Linaro LKFT https://lkft.linaro.org