linux-kernel - Re: [PATCH v3 15/28] module: Use RCU in all users of __module_text

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Message-ID: <20250424151714.GA18306@noisy.programming.kicks-ass.net>
Date: Thu, 24 Apr 2025 17:17:14 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Benjamin Berg <benjamin@...solutions.net>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org,
	johannes@...solutions.net, Daniel Gomez <da.gomez@...sung.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 15/28] module: Use RCU in all users of
 __module_text_address().

On Thu, Apr 24, 2025 at 11:30:39AM +0200, Benjamin Berg wrote:

> Not sure if something like that would be desirable upstream. This is
> happening for us when running the hostap "hwsim" tests inside UML (with
> time-travel). At least internally, we could carry a custom patch to add
> the lockdep_off()/lockdep_on() to dump_trace in order to work around
> it[1].

Urgh, so lockdep_off() usage is a really bad sign.

Having just done a git-grep, I see there's crap to clean out :-(

Some day I'll manage to remove that thing.