About the CPU memory model that risc-v linux kernel assumes

Hi Guys, the Risc-V instruction set provides two types of memory models, the RVWMO and RVTSO. Now, the Linux kernel for Risc-V is already released. I am curious about what type of memory model that Linux kernel for Risc-V assumes? The RVWMO or RVTSO?

Thanks for your help in advance!