linux-kernel - [PATCH] configs/debug: add NET debug config

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Date: Mon, 12 Feb 2024 11:47:14 +0100
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Qian Cai <quic_qiancai@...cinc.com>, 
 Kees Cook <keescook@...omium.org>, mptcp@...ts.linux.dev, 
 netdev@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, 
 "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
Subject: [PATCH] configs/debug: add NET debug config

The debug.config file is really great to easily enable a bunch of
general debugging features on a CI-like setup. But it would be great to
also include core networking debugging config.

A few CI's validating features from the Net tree also enable a few other
debugging options on top of debug.config. A small selection is quite
generic for the whole net tree. They validate some assumptions in
different parts of the core net tree. As suggested by Jakub Kicinski in
[1], having them added to this debug.config file would help other CIs
using network features to find bugs in this area.

Note that the two REFCNT configs also select REF_TRACKER, which doesn't
seem to be an issue.

Link: https://lore.kernel.org/netdev/20240202093148.33bd2b14@kernel.org/T/ [1]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
Notes:
  - It looks like this debug.config doesn't have a specific maintainer.
    If this patch is not rejected, I don't know if this modification can
    go through the net tree, or if it should be handled by Andrew.
    Probably the latter? I didn't add [net-next] in the subject for this
    reason.
---
 kernel/configs/debug.config | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/configs/debug.config b/kernel/configs/debug.config
index 4722b998a324..509ee703de15 100644
--- a/kernel/configs/debug.config
+++ b/kernel/configs/debug.config
@@ -40,6 +40,12 @@ CONFIG_UBSAN_ENUM=y
 CONFIG_UBSAN_SHIFT=y
 CONFIG_UBSAN_UNREACHABLE=y
 #
+# Networking Debugging
+#
+CONFIG_NET_DEV_REFCNT_TRACKER=y
+CONFIG_NET_NS_REFCNT_TRACKER=y
+CONFIG_DEBUG_NET=y
+#
 # Memory Debugging
 #
 # CONFIG_DEBUG_PAGEALLOC is not set

---
base-commit: 841c35169323cd833294798e58b9bf63fa4fa1de
change-id: 20240212-kconfig-debug-enable-net-c2dc61002252

Best regards,
-- 
Matthieu Baerts (NGI0) <matttbe@...nel.org>