bpf: Update bpf_design_QA.rst to clarify that BTF_ID does not ABIify …

…a function This patch updates bpf_design_QA.rst to clarify that mentioning a function to the BTF_ID macro does not make that function become part of the Linux kernel's ABI. Suggested-by: Alexei Starovoitov <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Alexei Starovoitov <[email protected]>
kvm-riscv · Aug 4, 2022 · 8fcf196 · 8fcf196
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diff --git a/Documentation/bpf/bpf_design_QA.rst b/Documentation/bpf/bpf_design_QA.rst
@@ -291,3 +291,10 @@ The kernel function prototypes will change, and BPF programs attaching to
 them will need to change.  The BPF compile-once-run-everywhere (CO-RE)
 should be used in order to make it easier to adapt your BPF programs to
 different versions of the kernel.
+
+Q: Marking a function with BTF_ID makes that function an ABI?
+-------------------------------------------------------------
+A: NO.
+
+The BTF_ID macro does not cause a function to become part of the ABI
+any more than does the EXPORT_SYMBOL_GPL macro.