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It seems that there is no definition for config IP_GRE, and it is not a dependency of other configs, so remove it. linux$ find -name Kconfig | xargs grep "IP_GRE" <-- nothing There is a IPV6_GRE config defined in net/ipv6/Kconfig. It only depends on NET_IPGRE_DEMUX but not IP_GRE. Signed-off-by: Yujie Liu <yujie.liu@intel.com> Acked-by: Jakub Kicinski <kuba@kernel.org> Link: https://patch.msgid.link/20240624055539.2092322-1-yujie.liu@intel.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>