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

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Message-ID: <20250107115832.jLUSKKwG@linutronix.de>
Date: Tue, 7 Jan 2025 12:58:32 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
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

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