netdev - [PATCH v3 bpf 3/3] bpf: Update bpf_design_QA.rst to clarify that BTF

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Date:   Tue,  2 Aug 2022 10:39:13 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-doc@...r.kernel.org
Cc:     corbet@....net, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, kernel-team@...com,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: [PATCH v3 bpf 3/3] 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@...il.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 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 a06ae8a828e3d..a210b8a4df005 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.
-- 
2.31.1.189.g2e36527f23