reproduce (this is a W=1 build):
        git remote add axboe-block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
        git fetch axboe-block for-6.5/block
        git checkout axboe-block/for-6.5/block
        b4 shazam https://lore.kernel.org/r/20230621162333.30027-2-jack@suse.cz
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/md/bcache/