Merge patch series "RISC-V: Align the shadow stack"

Palmer Dabbelt <palmer@rivosinc.com> says:

This contains a pair of cleanups that depend on a fix that has already
landed upstream.

* b4-shazam-merge:
  RISC-V: Add some comments about the shadow and overflow stacks
  RISC-V: Align the shadow stack
  riscv: fix race when vmap stack overflow

Link: https://lore.kernel.org/r/20221130023515.20217-1-palmer@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>