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

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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)
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.