linux-kernel - RE: RE: [PATCH] powerpc: Allow scheduling of IRQ with PREEMPT

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Message-ID:
 <PH0PR22MB3809CB75F0E567EA0C72E997E51C2@PH0PR22MB3809.namprd22.prod.outlook.com>
Date: Fri, 10 Jan 2025 22:36:39 +0000
From: Robert Joslyn <robert_joslyn@...inc.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "rostedt@...dmis.org"
	<rostedt@...dmis.org>,
        Shrikanth Hegde <sshegde@...ux.ibm.com>
Subject: RE: RE: [PATCH] powerpc: Allow scheduling of IRQ with PREEMPT_RT

> -----Original Message-----
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Sent: Thursday, January 9, 2025 3:44 AM
> To: Robert Joslyn <robert_joslyn@...inc.com>
> Cc: linux-kernel@...r.kernel.org; linux-rt-users@...r.kernel.org;
> tglx@...utronix.de; rostedt@...dmis.org; Shrikanth Hegde
> <sshegde@...ux.ibm.com>
> Subject: Re: RE: [PATCH] powerpc: Allow scheduling of IRQ with PREEMPT_RT
> 
> [Caution - External]
> 
> On 2025-01-07 18:09:46 [+0000], Robert Joslyn wrote:
> >
> > Yes, I'm using 6.6.58-rt45 at the moment. We found this regression
> > while trying to update from 5.10-rt. I haven't played with
> > lazy-preempt yet but I can certainly test the patches, presently we
> > run everything with PREEMPT_RT.
> 
> So I released v6.12.8-rt8 and v6.13-rc6-rt3. Looking at the lazy bits I think I
> just forward your patch to the stable queue for v6.6.

I did some basic testing on 6.12.8-rt8 and that worked fine with both preempt_lazy and preempt_rt.

For what it's worth, we've been using the patch for 6.6-rt for about a month now in internal testing and haven't seen any other issues.

Thanks!
Robert