Commit 8fcf1969 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Alexei Starovoitov
Browse files

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: default avatarAlexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/r/20220802173913.4170192-3-paulmck@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 62fc770d

Documentation/bpf/bpf_design_QA.rst

+7 −0
Original line number Diff line number Diff line
@@ -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.