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In xen_9pfs_front_init(), parse the backend version list as comma-separated tokens with kstrtouint(), keep strict token validation, and explicitly require protocol version 1 to be present. This replaces the deprecated simple_strtoul(), improves error reporting consistency, and avoids partially parsed values in control paths. Signed-off-by: Yufan Chen <[email protected]> Reviewed-by: Stefano Stabellini <[email protected]> Message-ID: <[email protected]> Signed-off-by: Dominique Martinet <[email protected]>