netdev - Re: [PATCH net-next v13 2/4] ethtool: provide customized dim profile management

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Date: Mon, 13 May 2024 07:22:49 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Heng Qi <hengqi@...ux.alibaba.com>
Cc: kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
 oe-kbuild-all@...ts.linux.dev, "David S . Miller" <davem@...emloft.net>,
 Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, Jason
 Wang <jasowang@...hat.com>, "Michael S . Tsirkin" <mst@...hat.com>, Brett
 Creeley <bcreeley@....com>, Ratheesh Kannoth <rkannoth@...vell.com>,
 Alexander Lobakin <aleksander.lobakin@...el.com>, Xuan Zhuo
 <xuanzhuo@...ux.alibaba.com>, Tal Gilboa <talgi@...dia.com>, Jonathan
 Corbet <corbet@....net>, linux-doc@...r.kernel.org, Maxime Chevallier
 <maxime.chevallier@...tlin.com>, Jiri Pirko <jiri@...nulli.us>, Paul
 Greenwalt <paul.greenwalt@...el.com>, Ahmed Zaki <ahmed.zaki@...el.com>,
 Vladimir Oltean <vladimir.oltean@....com>, Kory Maincent
 <kory.maincent@...tlin.com>, Andrew Lunn <andrew@...n.ch>,
 justinstitt@...gle.com, donald.hunter@...il.com, netdev@...r.kernel.org,
 virtualization@...ts.linux.dev
Subject: Re: [PATCH net-next v13 2/4] ethtool: provide customized dim
 profile management

On Mon, 13 May 2024 00:36:58 +0800 Heng Qi wrote:
> This failed use case seems to come from this series triggering a problem that
> has not been triggered historically, namely lockdep_rtnl_is_held() is not called
> in an environment where CONFIG_NET is not configured and CONFIG_PROVE_LOCKING is
> configured:
>   If CONFIG_PROVE_LOCKING is configured as Y and CONFIG_NET is n, then
>   lockdep_rtnl_is_held is in an undefined state at this time.
> 
> So I think we should declare "CONFIG_PROVE_LOCKING depends on CONFIG_NET".
> How do you think?

Doesn't sound right, can we instead make building lib/dim/net_dim.c
dependent on CONFIG_NET? Untested but I'm thinking something like:

diff --git a/lib/dim/Makefile b/lib/dim/Makefile
index c4cc4026c451..c02c306e2975 100644
--- a/lib/dim/Makefile
+++ b/lib/dim/Makefile
@@ -4,4 +4,8 @@

 obj-$(CONFIG_DIMLIB) += dimlib.o

-dimlib-objs := dim.o net_dim.o rdma_dim.o
+dimlib-objs := dim.o rdma_dim.o
+
+ifeq ($(CONFIG_NET),y)
+dimlib-objs += net_dim.o
+endif