Hi Bruce. Due to the combination of kernel patches ( commit id "99705220b22ca116457edeae51ae817d056a6622" Use rwsem instead of a seqcount).
Integrate RT patch("net-Add-a-mutex-around-devnet_rename_seq.patch") when compiling real-time kernel, The following error will be reported: " kernel-source/net/core/dev.c:1181:16: error: 'devnet_rename_mutex' undeclared (first use in this function); did you mean 'devnet_rename_sem'? 1181 | mutex_unlock(&devnet_rename_mutex); "
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