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I'm wondering if i want to fix code in > tools/include/uapi/linux/in.h next time, should i just modify > include/uapi/linux/in.h, and it will auto 'Sync' to tools/include/uapi/ > linux/in.h? Or i need to modify tools/include/uapi/linux/in.h at the > same time? Either way is okay. If you do 'git log' on tools/include/uapi/linux directory, you can find examples for both approaches.