linux-kernel - Re: [PATCH v10 00/21] futex: Add support task local hash maps, FUTEX2_NUMA and FUTEX2

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Message-ID: <20250314141841.GD36322@noisy.programming.kicks-ass.net>
Date: Fri, 14 Mar 2025 15:18:41 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: linux-kernel@...r.kernel.org,
	André Almeida <andrealmeid@...lia.com>,
	Darren Hart <dvhart@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>, Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Waiman Long <longman@...hat.com>,
	Paul McKenney <paulmck@...nel.org>
Subject: Re: [PATCH v10 00/21] futex: Add support task local hash maps,
 FUTEX2_NUMA and FUTEX2_MPOL

On Fri, Mar 14, 2025 at 02:30:39PM +0100, Sebastian Andrzej Siewior wrote:
> On 2025-03-14 13:30:58 [+0100], Peter Zijlstra wrote:
> > > > Yeah, but sparse is stupid.
> > > 
> > > I though we like sparse.
> > 
> > I always ignore it, too much noise.
> 
> What do you suggest? Cleaning up that noise that noise or moving that
> RCU checking towards other tooling which is restricted to RCU only?
> Knowing you, you have already a plan in your cupboard but not the time :)

No real plan. Its been so long since I ran sparse I can't even remember
the shape of the noise, just that there was a _lot_ of it.

But IIRC the toolchains are starting to introduce address spaces:

  https://lkml.kernel.org/r/20250127160709.80604-1-ubizjak@gmail.com

so perhaps the __rcu thing can go that way.