reproduce:
        git remote add axboe-block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
        git fetch axboe-block for-next
        git checkout axboe-block/for-next
        b4 shazam https://lore.kernel.org/r/20241101144616.497602-5-john.g.garry@oracle.com
        make W=1 O=/tmp/kselftest headers
        make W=1 O=/tmp/kselftest -C tools/testing/selftests
        make W=1 O=/tmp/kselftest -C tools/testing/selftests/bpf