reproduce (this is a W=1 build):
        git remote add bluetooth https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git
        git fetch bluetooth master
        git checkout bluetooth/master
        b4 shazam https://lore.kernel.org/r/tencent_2FAB909645504A5E0FDC88F125E139242C05@qq.com

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/dpll/ drivers/net/phy/realtek/ drivers/scsi/qla2xxx/ kernel/ net/bluetooth/