/usr/include/atomic_ops/sysdeps/loadstore/ is in libatomic-ops-dev 7.6.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/atomic_ops/sysdeps/loadstore/acquire_release_volatile.h
/usr/include/atomic_ops/sysdeps/loadstore/atomic_load.h
/usr/include/atomic_ops/sysdeps/loadstore/atomic_store.h
/usr/include/atomic_ops/sysdeps/loadstore/char_acquire_release_volatile.h
/usr/include/atomic_ops/sysdeps/loadstore/char_atomic_load.h
/usr/include/atomic_ops/sysdeps/loadstore/char_atomic_store.h
/usr/include/atomic_ops/sysdeps/loadstore/double_atomic_load_store.h
/usr/include/atomic_ops/sysdeps/loadstore/int_acquire_release_volatile.h
/usr/include/atomic_ops/sysdeps/loadstore/int_atomic_load.h
/usr/include/atomic_ops/sysdeps/loadstore/int_atomic_store.h
/usr/include/atomic_ops/sysdeps/loadstore/ordered_loads_only.h
/usr/include/atomic_ops/sysdeps/loadstore/ordered_stores_only.h
/usr/include/atomic_ops/sysdeps/loadstore/short_acquire_release_volatile.h
/usr/include/atomic_ops/sysdeps/loadstore/short_atomic_load.h
/usr/include/atomic_ops/sysdeps/loadstore/short_atomic_store.h