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This reverts commitd7cd421da9. As reported by Al Viro, the TCP ULP support for SMC is fundamentally broken. The implementation attempts to convert an active TCP socket into an SMC socket by modifying the underlying `struct file`, dentry, and inode in-place, which violates core VFS invariants that assume these structures are immutable for an open file, creating a risk of use after free errors and general system instability. Given the severity of this design flaw and the fact that cleaner alternatives (e.g., LD_PRELOAD, BPF) exist for legacy application transparency, the correct course of action is to remove this feature entirely. Fixes:d7cd421da9("net/smc: Introduce TCP ULP support") Link: https://lore.kernel.org/netdev/Yus1SycZxcd+wHwz@ZenIV/ Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: D. Wythe <alibuda@linux.alibaba.com> Reviewed-by: Tony Lu <tonylu@linux.alibaba.com> Reviewed-by: Dust Li <dust.li@linux.alibaba.com> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20260128055452.98251-1-alibuda@linux.alibaba.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>