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Add documentation on shadow stack for user mode on riscv and the kernel interfaces exposed for user tasks to enable it. Reviewed-by: Zong Li <zong.li@sifive.com> Signed-off-by: Deepak Gupta <debug@rivosinc.com> Link: https://patch.msgid.link/20251112-v5_user_cfi_series-v23-27-b55691eacf4f@rivosinc.com [pjw@kernel.org: cleaned up the documentation, patch description] Signed-off-by: Paul Walmsley <pjw@kernel.org>