/usr/include/mpich/primitives/ is in libmpich-dev 3.1-5+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mpich/primitives/opa_by_lock.h
/usr/include/mpich/primitives/opa_emulated.h
/usr/include/mpich/primitives/opa_gcc_ia64.h
/usr/include/mpich/primitives/opa_gcc_intel_32_64.h
/usr/include/mpich/primitives/opa_gcc_intel_32_64_barrier.h
/usr/include/mpich/primitives/opa_gcc_intel_32_64_ops.h
/usr/include/mpich/primitives/opa_gcc_intel_32_64_p3.h
/usr/include/mpich/primitives/opa_gcc_intel_32_64_p3barrier.h
/usr/include/mpich/primitives/opa_gcc_intrinsics.h
/usr/include/mpich/primitives/opa_gcc_ppc.h
/usr/include/mpich/primitives/opa_gcc_sicortex.h
/usr/include/mpich/primitives/opa_nt_intrinsics.h
/usr/include/mpich/primitives/opa_sun_atomic_ops.h
/usr/include/mpich/primitives/opa_unsafe.h