Following build regressions noticed on Linux next-20230619.

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

Regressions found on powerpc:

- build/clang-nightly-maple_defconfig - build/gcc-8-maple_defconfig - build/gcc-12-maple_defconfig - build/clang-nightly-cell_defconfig - build/gcc-12-cell_defconfig - build/gcc-8-cell_defconfig - build/clang-16-cell_defconfig - build/clang-16-maple_defconfig

Build log: arch/powerpc/kernel/stacktrace.c: In function 'handle_backtrace_ipi': arch/powerpc/kernel/stacktrace.c:171:9: error: implicit declaration of function 'nmi_cpu_backtrace' [-Werror=implicit-function-declaration] 171 | nmi_cpu_backtrace(regs); | ^~~~~~~~~~~~~~~~~ arch/powerpc/kernel/stacktrace.c: In function 'arch_trigger_cpumask_backtrace': arch/powerpc/kernel/stacktrace.c:226:9: error: implicit declaration of function 'nmi_trigger_cpumask_backtrace'; did you mean 'arch_trigger_cpumask_backtrace'? [-Werror=implicit-function-declaration] 226 | nmi_trigger_cpumask_backtrace(mask, exclude_self, raise_backtrace_ipi); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | arch_trigger_cpumask_backtrace cc1: all warnings being treated as errors

Links: - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230619/tes... - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230619/tes... - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230619/tes...

Steps to reproduce: # To install tuxmake to your home directory at ~/.local/bin: # pip3 install -U --user tuxmake # # Or install a deb/rpm depending on the running distribution # See https://tuxmake.org/install-deb/ or # https://tuxmake.org/install-rpm/ # # See https://docs.tuxmake.org/ for complete documentation.

tuxmake --runtime podman --target-arch powerpc --toolchain gcc-12 --kconfig cell_defconfig

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