reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/fa13da135c46ed95604a44c0723b4abeddd5eb7f
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Andrew-Murray/printk-remove-BOOT_PRINTK_DELAY/20260514-132813
        git checkout fa13da135c46ed95604a44c0723b4abeddd5eb7f

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/printk/ mm/