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When port I/O is not supported, exposing the port-string helpers is both unnecessary and can make clang diagnose null-pointer arithmetic from the PCI_IOBASE based address expression. Keep the MMIO string helpers available as before, but only provide the port I/O variants when CONFIG_HAS_IOPORT is enabled. Signed-off-by: Yunhui Cui <cuiyunhui@bytedance.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Link: https://patch.msgid.link/20260703122832.15984-2-cuiyunhui@bytedance.com Signed-off-by: Paul Walmsley <pjw@kernel.org>