From 8fcf19696a1bdbabb7774e8d063ee4af91833402 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Tue, 2 Aug 2022 10:39:13 -0700 Subject: [PATCH] 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 Signed-off-by: Paul E. McKenney Link: https://lore.kernel.org/r/20220802173913.4170192-3-paulmck@kernel.org Signed-off-by: Alexei Starovoitov --- Documentation/bpf/bpf_design_QA.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/bpf/bpf_design_QA.rst b/Documentation/bpf/bpf_design_QA.rst index a06ae8a828e3..a210b8a4df00 100644 --- 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. -- 2.25.1