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inode->i_ino is being converted to a u64. sock.sk_ino (which caches the inode number) must also be widened to avoid truncation on 32-bit architectures where unsigned long is only 32 bits. Change sk_ino from unsigned long to u64, and update the return type of sock_i_ino() to match. Fix all format strings that print the result of sock_i_ino() (%lu -> %llu), and widen the intermediate variables and function parameters in the diag modules that were using int to hold the inode number. Note that the UAPI socket diag structures (inet_diag_msg.idiag_inode, unix_diag_msg.udiag_ino, etc.) are all __u32 and cannot be changed without breaking the ABI. The assignments to those fields will silently truncate, which is the existing behavior. Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> # for net/can Signed-off-by: Jeff Layton <jlayton@kernel.org> Link: https://patch.msgid.link/20260304-iino-u64-v3-3-2257ad83d372@kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org>