reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=adc00a0daf1bb08915bceee9ae73cca682e7d5bb
        git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
        git fetch --no-tags tip timers/vdso
        git checkout adc00a0daf1bb08915bceee9ae73cca682e7d5bb
        # apt-get install sparse
        # sparse version: v0.6.4-73-gfbdde312

        # 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 arch/x86/entry/ arch/x86/events/ arch/x86/kernel/ arch/x86/lib/ arch/x86/mm/ block/ drivers/media/usb/uvc/ drivers/thermal/intel/ fs/ init/ kernel/ lib/ mm/ net/core/ net/ipv4/ net/ipv6/ net/sched/