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authorPaul E. McKenney <paulmck@kernel.org>2022-08-02 20:39:13 +0300
committerAlexei Starovoitov <ast@kernel.org>2022-08-04 23:17:24 +0300
commit8fcf19696a1bdbabb7774e8d063ee4af91833402 (patch)
treedd6cd205440b1070e2effb95368e1bf8241bd26c /Documentation/bpf
parent62fc770d90ef5a92931deb477c384f82be122a18 (diff)
downloadlinux-8fcf19696a1bdbabb7774e8d063ee4af91833402.tar.xz
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>
Diffstat (limited to 'Documentation/bpf')
-rw-r--r--Documentation/bpf/bpf_design_QA.rst7
1 files changed, 7 insertions, 0 deletions
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.