[PATCH v3 bpf 1/3] bpf: Update bpf_design_QA.rst to clarify that kprobes is not ABI
From: "Paul E. McKenney" <paulmck@kernel.org>
Date: 2022-08-02 17:39:23
Also in:
bpf, linux-doc
Subsystem:
bpf [general] (safe dynamic programs and tools), documentation, the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Jonathan Corbet, Linus Torvalds
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@kernel.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
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2.31.1.189.g2e36527f23