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+What: /sys/kernel/btf
+Date: Aug 2019
+KernelVersion: 5.5
+Contact: bpf@vger.kernel.org
+Description:
+ Contains BTF type information and related data for kernel and
+ kernel modules.
+
+What: /sys/kernel/btf/vmlinux
+Date: Aug 2019
+KernelVersion: 5.5
+Contact: bpf@vger.kernel.org
+Description:
+ Read-only binary attribute exposing kernel's own BTF type
+ information with description of all internal kernel types. See
+ Documentation/bpf/btf.rst for detailed description of format
+ itself.
+
+What: /sys/kernel/btf/<module-name>
+Date: Nov 2020
+KernelVersion: 5.11
+Contact: bpf@vger.kernel.org
+Description:
+ Read-only binary attribute exposing kernel module's BTF type
+ information as an add-on to the kernel's BTF (/sys/kernel/btf/vmlinux).