reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        # https://github.com/intel-lab-lkp/linux/commit/ec3d1d253e329709de10da143f4793a5830a135d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review luca-boccassi-gmail-com/pidfd-add-ioctl-to-retrieve-pid-info/20241002-223302
        git checkout ec3d1d253e329709de10da143f4793a5830a135d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=x86_64 olddefconfig
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=x86_64 SHELL=/bin/bash fs/