[bpf,1/2] bpf: Update bpf_design_QA.rst to clarify that kprobes is not ABI

Commit Message

Paul E. McKenney July 22, 2022, 6:06 p.m. UTC

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 <[e-mail]>
---
 Documentation/bpf/bpf_design_QA.rst | 6 ++++++
 1 file changed, 6 insertions(+)

Patch

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