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

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Message-ID:
 <SJ2PR22MB382271FBE556A6A4AD978F0CE5112@SJ2PR22MB3822.namprd22.prod.outlook.com>
Date: Tue, 7 Jan 2025 18:09:46 +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: [PATCH] powerpc: Allow scheduling of IRQ with PREEMPT_RT

> -----Original Message-----
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Sent: Tuesday, January 7, 2025 3:59 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: [PATCH] powerpc: Allow scheduling of IRQ with PREEMPT_RT
> 
> [Caution - External]
> 
> On 2025-01-07 12:56:08 [+0100], To Robert Joslyn wrote:
> > On 2024-12-26 11:12:38 [-0800], Robert Joslyn wrote:
> > > This branch is needed to allow preemptible IRQs to be scheduled,
> > > otherwise the kernel hangs during boot on my e300 based platforms.
> > > This branch is needed for both CONFIG_PREEMPT and
> CONFIG_PREEMPT_RT,
> > > so broaden the check to CONFIG_PREEMPTION, which is selected by both.
> > >
> > > This was previously set to CONFIG_PREEMPTION, but was reverted as
> > > part of removing LAZY_PREEMPT support.
> >
> > I remember I pointed this out while Shrikanth posted the preempt-lazy
> > patches but didn't realize that I need this in RT tree, too.
> >
> > The lazy-preempt patches for powerpc were merged upstream, I am going
> > to pull them into the v6.6-series.
> > I am going to Cc you, hopefully you can confirm that it is working.
> 
> Robert, you are referring to v6.6-RT, correct?
> 
> Sebastian

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.

Thanks,
Robert