linux-kernel - Re: [PATCH] softirq: Provide a handshake for canceling tasklets via polling on PREEMPT

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Message-ID: <aLIAx5Cf6mLC2Y_A@slm.duckdns.org>
Date: Fri, 29 Aug 2025 09:34:31 -1000
From: Tejun Heo <tj@...nel.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] softirq: Provide a handshake for canceling tasklets via
 polling on PREEMPT_RT

Hello, Sebastian.

On Thu, Aug 28, 2025 at 06:04:55PM +0200, Sebastian Andrzej Siewior wrote:
> On 2025-08-26 06:27:27 [-1000], Tejun Heo wrote:
> > Oh yeah, that makes a lot of sense to me - splitting it out into something
> > which is named explicitly to discourage further usages.
> 
> I am a bit lost now. Do you intend to apply the patch and we came up
> with the bh-canceling-from-bh API later on or what is the plan?

I'd much prefer if the end result is that the busy waiting is a separate
API. Whether that's done in a single patch or incremental patches doesn't
really matter.

Thanks.

-- 
tejun