linux-kernel - Re: [PATCH v2 1/3] tracing: Replace TRACE_FLAG_IRQS

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Message-ID: <20241022102906.KNgo1A2_@linutronix.de>
Date: Tue, 22 Oct 2024 12:29:06 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de,
	mingo@...nel.org, juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, bsegall@...gle.com, mgorman@...e.de,
	vschneid@...hat.com, ankur.a.arora@...cle.com, efault@....de,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH v2 1/3] tracing: Replace TRACE_FLAG_IRQS_NOSUPPORT with
 its config option.

On 2024-10-22 06:19:59 [-0400], Steven Rostedt wrote:
> On Tue, 22 Oct 2024 11:52:41 +0200
> Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
> 
> > > 
> > > Please just remove NOSUPPORT and do not touch NEED_RESCHED.  
> > 
> > Then I put the lazy bit where we have not NOSUPPORT.
> 
> I'm afraid user space will confuse this with the NOSUPPORT.

So? We don't ignore this for now and recycle that bit? If I got it
right, only PPC32 was using that NOSUPPORT bit.
What are the options given that it has to be an 8 bit field?

> -- Steve

Sebastian