linux-kernel - Re: [PATCH v3 0/3] Allow to drop the softirq-BKL lock on PREEMPT

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Message-ID: <20250915074216.VIaWMfNY@linutronix.de>
Date: Mon, 15 Sep 2025 09:42:16 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-rt-devel@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Cc: Clark Williams <clrkwllms@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH v3 0/3] Allow to drop the softirq-BKL lock on PREEMPT_RT

On 2025-09-04 16:25:22 [+0200], To linux-rt-devel@...ts.linux.dev wrote:
> Users which rely on synchronisation within a BH-disabled section as in
> - access to per-CPU data
> - per-CPU timers
> - synchronisation against another user within a BH-disabled section
> 
> rely on the local_lock_t lock in local_bh_disable() on PREEMPT_RT.
> Almost all users dropped their dependency. The remaining (identified)
> user in networking (pipapo) is in net-next.
> What is left is the infrastructure as in tasklet and workqueue (for
> bh-worker).
> Both are part of this series. The last patch in the series adds an
> option to drop the lock.

Could we please route #2 and #3 via -tip?

Sebastian