Palmer, with Konstantin's help, recently set up a shared tree for arch/riscv patches at:
git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git As with other kernel.org git trees, it can be browsed via HTTPS at: https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git/ This tree is what we'll use for upstream-bound patches going forward. - Paul