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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 <alexei.starovoitov@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/r/20220802173913.4170192-3-paulmck@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Paul E. McKenney 2022-08-02 10:39:13 -07:00 committed by Alexei Starovoitov
parent 62fc770d90
commit 8fcf19696a
1 changed files with 7 additions and 0 deletions
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Documentation/bpf/bpf_design_QA.rst
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@ -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) 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 should be used in order to make it easier to adapt your BPF programs to
different versions of the kernel. 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.