netdev - [PATCH v2 bpf 1/2] bpf: Update bpf_design_QA.rst to clarify that kprobes is not ABI

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Message-Id: <20220726234401.3425557-1-paulmck@kernel.org>
Date:   Tue, 26 Jul 2022 16:44:00 -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>
Subject: [PATCH v2 bpf 1/2] bpf: Update bpf_design_QA.rst to clarify that kprobes is not ABI

This patch updates bpf_design_QA.rst to clarify that the ability to
attach a BPF program to a given point in the kernel code via kprobes
does not make that attachment point be part of the Linux kernel's ABI.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 Documentation/bpf/bpf_design_QA.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/bpf/bpf_design_QA.rst b/Documentation/bpf/bpf_design_QA.rst
index 437de2a7a5de7..2ed9128cfbec8 100644
--- a/Documentation/bpf/bpf_design_QA.rst
+++ b/Documentation/bpf/bpf_design_QA.rst
@@ -214,6 +214,12 @@ A: NO. Tracepoints are tied to internal implementation details hence they are
 subject to change and can break with newer kernels. BPF programs need to change
 accordingly when this happens.
 
+Q: Are places where kprobes can attach part of the stable ABI?
+--------------------------------------------------------------
+A: NO. The places to which kprobes can attach are internal implementation
+details, which means that they are subject to change and can break with
+newer kernels. BPF programs need to change accordingly when this happens.
+
 Q: How much stack space a BPF program uses?
 -------------------------------------------
 A: Currently all program types are limited to 512 bytes of stack
-- 
2.31.1.189.g2e36527f23